Overcurrent detection device, protection device and abnormal early warning method

Abstract

The application relates to an overcurrent detection device, a protection device and an abnormality early warning method. The overcurrent detection device comprises a sampling unit configured to sample a first measurement unit to obtain a first current value; a transceiving unit configured to receive a second current value to an Nth current value from N-1 other overcurrent detection devices; a difference value calculation unit configured to calculate a first current difference value to an N-1th current difference value, the first current difference value to the N-1th current difference value representing current difference values of the first current value and the second current value to the Nth current value respectively; and an early warning output unit configured to output a first early warning signal when the first current difference value to the N-1th current difference value is greater than a first difference threshold value to an N-1th difference threshold value respectively. The overcurrent detection device can perform comparison of current values between multiple overcurrent detection devices running in parallel, and enhance the panoramic fault monitoring and early warning capability of a valve control system.

Description

Technical Field

[0001] This application relates to the field of power system energy storage technology, and in particular to overcurrent detection devices, protection devices and abnormal early warning methods. Background Technology

[0002] The novel energy storage valve control system is the core control equipment of a new energy storage system. During operation, the overcurrent detection device in this system may experience communication interruptions, program crashes, program bugs, CPU freezes, or other abnormal crashes, thus affecting the commissioning and decommissioning of the entire converter station. Therefore, timely early warning of abnormal operation of the overcurrent detection device is crucial.

[0003] Traditional technologies suffer from insufficient early warning strategies for valve control systems, especially in the field of new energy storage ultra-high voltage, where the reliability requirements for valve control systems are even more stringent. Summary of the Invention

[0004] In view of the above problems, this application provides an overcurrent detection device, a protection device, and an anomaly early warning method, which can enhance the ability of the overcurrent detection device to provide early warning of anomalies and make the early warning strategy in the energy storage valve control system more complete.

[0005] In a first aspect, this application provides an overcurrent detection device that operates in parallel with N-1 other overcurrent detection devices in an N-M redundancy structure of an energy storage valve control system, where N is an integer greater than or equal to 3 and M is an integer less than N. The overcurrent detection device is communicatively connected to the N-1 other overcurrent detection devices. The overcurrent detection device includes: a sampling unit configured to sample the first measurement unit to obtain a first current value; a transceiver unit configured to receive, from the N-1 other overcurrent detection devices, the second to Nth current values ​​sampled by each overcurrent detection device for the corresponding measurement unit; a difference calculation unit configured to calculate the first to N-1th current difference, where the first to N-1th current difference represents the current difference between the first current value and the second to Nth current values; and a warning output unit configured to output a first warning signal when the first to N-1th current difference is greater than a first to N-1th difference threshold value corresponding to the first to N-1th current difference, whereby the first warning signal indicates an abnormality in the overcurrent detection device.

[0006] In the technical solution of this application embodiment, the overcurrent detection device receives current values ​​from N-1 other overcurrent detection devices via a transceiver unit, calculates the current difference between the current detection device and the other N-1 overcurrent detection devices via a difference calculation unit, and outputs a first warning signal via an early warning output unit when all N-1 current differences exceed the corresponding difference threshold. Therefore, when the current of the overcurrent detection device deviates significantly from the current of the other N-1 parallel-operating overcurrent detection devices, the user is notified of the overcurrent detection device's abnormality, thus achieving early warning of overcurrent detection device malfunctions. Correspondingly, the ability to warn of overcurrent detection device malfunctions is enhanced, making the early warning strategy in the energy storage valve control system more comprehensive, and thereby improving the reliability and safety of the valve control system.

[0007] In some embodiments, the difference calculation unit is configured to calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value. The warning output unit is further configured to: output a second warning signal when the (K-1)th current difference from the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold value, the second warning signal indicates that the overcurrent detection device that sampled the Kth current value is malfunctioning.

[0008] When the current difference between this overcurrent detection device and only one other overcurrent detection device exceeds the corresponding difference threshold, the early warning output unit compares the current difference between the other N-1 overcurrent detection devices with the corresponding difference threshold to provide an abnormal early warning for the other N-1 overcurrent detection devices.

[0009] In some embodiments, the overcurrent detection device further includes: a storage unit configured to store a plurality of first current values ​​to Nth current values ​​associated with a sampling sequence number within a predetermined time period including a plurality of time segments; and a difference threshold calculation unit configured to calculate, based on the stored plurality of first current values ​​to Nth current values, a first difference threshold value to the (N-1)th difference threshold value, and to calculate each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value, when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range.

[0010] By dynamically calculating and updating the difference threshold value in real time through the difference threshold value calculation unit, it is possible to more accurately identify overcurrent detection devices whose sampling values ​​are abnormal compared to other overcurrent detection devices.

[0011] In some embodiments, the difference calculation unit is configured to: at each time segment within the predetermined time period, calculate, according to the corresponding sampling sequence number, the first current difference to the (N-1)th current difference between the stored first current value and the stored second current value to the Nth current value, and calculate, respectively, the current difference between the Kth current value among the stored second current value to the Nth current value and the remaining current values ​​among the second current value to the Nth current value. The difference threshold calculation unit is configured to: calculate, respectively, the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value at each time segment; and calculate, respectively, the difference threshold values ​​of the Kth current value relative to the remaining current values ​​among the second current value to the Nth current value based on the Kth current value and the remaining current values ​​among the second current value to the Nth current value at each time segment.

[0012] The difference calculation unit calculates the first current difference to the (N-1)th current difference under multiple time sections, as well as the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value under multiple time sections. This enables the difference threshold calculation unit to obtain more reliable and accurate first difference threshold values ​​to the (N-1)th difference threshold values, as well as the difference threshold values ​​between the Kth current value and the remaining current values ​​from the second current value to the Nth current value.

[0013] In some embodiments, the difference calculation unit is configured to: calculate the average value of each of the plurality of first current differences to the plurality of (N-1)th current differences under the plurality of time sections to obtain the typical values ​​of the first difference to the (N-1)th difference; calculate the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value under the plurality of time sections to obtain the typical values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value. The difference threshold calculation unit is configured to: calculate the product of the typical values ​​of the first difference to the (N-1)th difference and a preset threshold coefficient to obtain the first difference threshold value to the (N-1)th difference threshold value; and calculate the product of the typical values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient to obtain the threshold values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value.

[0014] The difference calculation unit calculates the average value of each of the first current difference to the N-1th current difference under multiple time sections, and obtains the typical value of the first difference to the N-1th difference. Then, the difference threshold calculation unit supplements each typical value of the difference with a preset threshold coefficient, which improves the accuracy of the difference threshold and makes the horizontal data comparison results more accurate.

[0015] Secondly, this application provides an anomaly early warning method. The method is applied to an N-M redundancy structure in an energy storage valve control system, where N is an integer greater than or equal to 3, and M is an integer less than N. The N-M redundancy structure includes a first to an Nth overcurrent detection device operating in parallel, and a protection device. The first to the Nth overcurrent detection devices are adapted to sample the first to the Nth measurement units to obtain a first to the Nth current value. The protection device is adapted to perform N-M voting on the overcurrent detection results output by the first to the Nth overcurrent detection devices and output the N-M voting result. Each of the first to the Nth overcurrent detection devices is communicatively connected to N-1 other overcurrent detection devices. The method is described by... The method is executed by any one of the overcurrent detection devices from the first overcurrent detection device to the Nth overcurrent detection device. When the method is executed by the first overcurrent detection device, the method includes: receiving a second current value to a Nth current value from the second overcurrent detection device to the Nth overcurrent detection device respectively; calculating a first current difference to a (N-1)th current difference, where the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value respectively; and when the first current difference to the (N-1)th current difference is greater than a first difference threshold value to a (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, outputting a first warning signal, whereby the first warning signal indicates that the first overcurrent detection device is abnormal.

[0016] In the technical solution of this application embodiment, any one overcurrent detection device is used as the main device. The main device receives the current values ​​of the other N-1 overcurrent detection devices laterally, thereby obtaining the current difference between the main device and the other N-1 overcurrent detection devices. Each of these N-1 current differences is compared with a corresponding difference threshold. When all N-1 current differences exceed the corresponding difference threshold, an anomaly warning is issued to the overcurrent detection device acting as the main device. Therefore, by comparing the current data between the various overcurrent detection devices, a lateral warning is achieved, improving the reliability and safety of the valve control system.

[0017] In some embodiments, the method further includes: calculating the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; and when the (K-1)th current difference from the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold, outputting a second warning signal, the second warning signal indicating that the Kth overcurrent detection device is abnormal.

[0018] In this embodiment, if the current difference between any overcurrent detection device and only another overcurrent detection device is greater than the corresponding difference threshold, the current difference between the other N-1 overcurrent detection devices is compared with the corresponding difference threshold, thereby achieving an abnormal warning for the other N-1 overcurrent detection devices.

[0019] In some embodiments, the method further includes: storing a plurality of first current values ​​to Nth current values ​​in association with sampling sequence numbers within a predetermined time period including a plurality of time segments; and when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range, calculating a first difference threshold value to the (N-1)th difference threshold value based on the stored plurality of first current values ​​to Nth current values, and calculating each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

[0020] Compared to using a pre-set value or a value manually set based on historical data as the difference threshold between overcurrent detection devices, the embodiments of this application can more accurately identify overcurrent detection devices that are abnormal relative to the sampling values ​​of other overcurrent detection devices by dynamically calculating and updating the difference threshold in real time.

[0021] In some embodiments, calculating the first difference threshold value to the (N-1)th difference threshold value, and calculating each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value, includes: at each time segment within the predetermined time period, calculating the stored first current value and the stored first current difference value to the (N-1)th current difference value of the stored second current value to the Nth current value according to the corresponding sampling sequence number, and calculating each current difference value of the Kth current value among the stored second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; calculating the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value at each time segment; and calculating each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value based on the Kth current value among the stored second current value to the Nth current value at each time segment.

[0022] In this embodiment of the application, by accumulating the first current difference to the (N-1)th current difference under multiple time sections, a more reliable first difference threshold value to the (N-1)th difference threshold value can be obtained accordingly.

[0023] In some embodiments, the step of calculating the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value in each time segment; and calculating the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value based on the current difference value between the Kth current value and the remaining current values ​​from the second current value to the Nth current value in each time segment, includes: calculating the average value of each of the plurality of first current differences to the plurality of (N-1)th current differences in the plurality of time segments to obtain the first difference typical value to the (N-1)th difference typical value; and calculating the first difference typical value to the (N-1)th difference typical value respectively. The product of the typical difference value and the preset threshold coefficient is used to obtain the first difference threshold value to the (N-1)th difference threshold value; the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is calculated one-to-one under the plurality of time sections to obtain the typical difference value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value; and the product of the typical difference value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient is calculated to obtain the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

[0024] In this embodiment, the average value of each of the first current difference to the (N-1)th current difference under multiple time sections is calculated to obtain the typical value of the first difference to the (N-1)th difference. By supplementing each typical value of the difference with a preset threshold coefficient, a more accurate difference threshold value can be obtained, thereby improving the reliability of each difference threshold value.

[0025] Thirdly, this application provides a protection device located in an N-to-M redundancy structure of an energy storage valve control system, where N is an integer greater than or equal to 3 and M is an integer less than N. The protection device is adapted to perform N-to-M voting on the overcurrent detection results output by the first to the Nth overcurrent detection devices operating in parallel and output the N-to-M voting result. The protection device includes: a receiving unit configured to receive a first current value to the Nth current value from the first to the Nth overcurrent detection devices respectively; a difference calculation unit configured to calculate a first current difference to the (N-1)th current difference, where the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second to the Nth current values ​​respectively; and a warning output unit configured to output a first warning signal when the first current difference to the (N-1)th current difference is greater than a first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, whereby the first warning signal indicates that the first overcurrent detection device is abnormal.

[0026] In the technical solution of this application embodiment, the receiving unit receives the first current value to the Nth current value from the first overcurrent detection device to the Nth overcurrent detection device respectively. Then, the difference calculation unit uses the first current value as a reference to obtain the first current difference to the N-1th current difference between the first current value and the other N-1 current values ​​respectively. Then, the warning output unit compares the first current difference to the N-1th current difference with the corresponding difference threshold value respectively. When all N-1 current differences exceed the corresponding difference threshold value, an abnormal warning is given to the first overcurrent detection device corresponding to the first current value.

[0027] In some embodiments, the difference calculation unit is configured to calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value. The warning output unit is configured to output a second warning signal when the (K-1)th current difference from the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold value, indicating that the Kth overcurrent detection device is abnormal.

[0028] When only one of the current differences from the first current difference to the (N-1)th current difference is greater than the difference threshold, for example, when only the (K-1)th current difference is greater than the (K-1)th difference threshold, the early warning output unit compares the current differences between the Kth current value and the remaining current values ​​from the second current value to the Nth current value with the corresponding difference threshold, thereby realizing an abnormal early warning for the second overcurrent detection device to the Nth overcurrent detection device.

[0029] In some embodiments, the protection device further includes: a storage unit configured to store a plurality of first current values ​​to Nth current values ​​associated with a sampling sequence number within a predetermined time period including a plurality of time segments; and a difference threshold calculation unit configured to calculate, based on the stored plurality of first current values ​​to Nth current values, a first difference threshold value to the (N-1)th difference threshold value, and to calculate each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value, when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range.

[0030] In some embodiments, the difference calculation unit is configured to, at each time segment within the predetermined time period, calculate, according to the corresponding sampling sequence number, the first current difference to the (N-1)th current difference between the stored first current value and the stored second current value to the Nth current value, and calculate, respectively, the current difference between the Kth current value among the stored second current value to the Nth current value and the remaining current values ​​among the second current value to the Nth current value. The difference threshold calculation unit is configured to: calculate, based on the first current difference to the (N-1)th current difference at each time segment, the first difference threshold value to the (N-1)th difference threshold value; and calculate, based on the Kth current value at each time segment and the current difference between the second current value to the Nth current value and the remaining current values ​​among the second current value to the Nth current value, the difference threshold values ​​of the Kth current value relative to the remaining current values ​​among the second current value to the Nth current value.

[0031] In some embodiments, the difference calculation unit is configured to: calculate the average value of each of the plurality of first current differences to the plurality of (N-1)th current differences under the plurality of time sections, to obtain the typical values ​​of the first difference to the (N-1)th difference; calculate the average value of each current difference corresponding one-to-one with the Kth current value and the remaining current values ​​from the second current value to the Nth current value under the plurality of time sections, to obtain the typical values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value. The difference threshold calculation unit is configured to: calculate the product of the first difference typical value to the (N-1)th difference typical value and a preset threshold coefficient, to obtain the first difference threshold value to the (N-1)th difference threshold value; and calculate the product of the typical value of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient, to obtain the difference threshold value between the Kth current value and the remaining current values ​​from the second current value to the Nth current value.

[0032] Fourthly, this application provides another method for abnormal early warning. The method is applied to an N-to-M redundancy structure in an energy storage valve control system, where N is an integer greater than or equal to 3, and M is an integer less than N. The N-to-M redundancy structure includes a first to an Nth overcurrent detection device operating in parallel, and a protection device. The first to the Nth overcurrent detection devices are adapted to sample the first to the Nth measurement units to obtain a first to an Nth current value. The protection device is adapted to perform N-to-M voting on the overcurrent detection results output by the first to the Nth overcurrent detection devices and output the N-to-M voting result. The method is performed by the protection device. The method includes: receiving a first current value to a Nth current value from the first overcurrent detection device to the Nth overcurrent detection device respectively; calculating a first current difference to a (N-1)th current difference, wherein the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value respectively; and outputting a first warning signal when the first current difference to the (N-1)th current difference is greater than a first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, wherein the first warning signal indicates that the first overcurrent detection device is abnormal.

[0033] In the technical solution of this application embodiment, a protection device is used as the execution subject. It receives the first current value to the Nth current value from the first overcurrent detection device to the Nth overcurrent detection device. Based on the first current value, it obtains the first current difference to the N-1th current difference between the first current value and the other N-1 current values. It compares the first current difference to the N-1th current difference with the corresponding difference threshold value. When all N-1 current differences exceed the corresponding difference threshold value, it provides an abnormal warning for the first overcurrent detection device corresponding to the first current value. Similarly, horizontal warning is achieved by comparing the current data between each overcurrent detection device.

[0034] In some embodiments, the method further includes: calculating the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; and when the (K-1)th current difference from the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold, outputting a second warning signal, the second warning signal indicating that the Kth overcurrent detection device is abnormal.

[0035] In this embodiment of the application, when the protection device is the main execution body, the abnormal warning of the second overcurrent detection device to the Nth overcurrent detection device can also be realized.

[0036] In some embodiments, the method further includes: storing a plurality of first current values ​​to Nth current values ​​in association with sampling sequence numbers within a predetermined time period including a plurality of time segments; and when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range, calculating a first difference threshold value to the (N-1)th difference threshold value based on the stored plurality of first current values ​​to Nth current values, and calculating each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

[0037] In some embodiments, calculating the first difference threshold value to the (N-1)th difference threshold value, and calculating the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value, includes: at each time segment within the predetermined time period, calculating the stored first current value and the stored first current difference to the (N-1)th current difference value from the second current value to the Nth current value according to the corresponding sampling sequence number, and calculating the current difference values ​​of the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; calculating the first difference threshold value to the (N-1)th difference threshold value based on the first current difference to the (N-1)th current difference value at each time segment; and calculating the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value based on the Kth current value and the remaining current values ​​from the second current value to the Nth current value at each time segment.

[0038] In some embodiments, the step of calculating the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value in each time segment; and calculating the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value based on the current difference value between the Kth current value and the remaining current values ​​from the second current value to the Nth current value in each time segment, includes: calculating the average value of each of the plurality of first current differences to the plurality of (N-1)th current differences in the plurality of time segments to obtain the first difference typical value to the (N-1)th difference typical value; and calculating the first difference typical value to the (N-1)th difference typical value respectively. The product of the typical difference value and the preset threshold coefficient is used to obtain the first difference threshold value to the (N-1)th difference threshold value; the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is calculated one-to-one under the plurality of time sections to obtain the typical difference value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value; and the product of the typical difference value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient is calculated to obtain the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

[0039] Fifthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the method described in the second or fourth aspect above.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0041] Figure 1 A schematic diagram of a part of a conventional energy storage valve control system;

[0042] Figure 2 This is a diagram illustrating the application environment of an overcurrent detection device according to some embodiments of this application;

[0043] Figure 3 This is a schematic diagram of the structure of an overcurrent detection device according to some embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the specific structure of an overcurrent detection device according to some embodiments of this application;

[0045] Figure 5 This is an application environment diagram of an overcurrent detection device according to some other embodiments of this application;

[0046] Figure 6 This is a schematic diagram of the structure of an overcurrent detection device according to some other embodiments of this application;

[0047] Figure 7 This is a schematic diagram of the specific structure of an overcurrent detection device according to some other embodiments of this application;

[0048] Figure 8 This is a flowchart illustrating an anomaly warning method performed by an overcurrent detection device according to some embodiments of this application;

[0049] Figure 9 This is a schematic flowchart illustrating a specific process of an abnormality warning method performed by an overcurrent detection device according to some embodiments of this application;

[0050] Figure 10 This is a flowchart illustrating an anomaly warning method performed by an overcurrent detection device according to some other embodiments of this application;

[0051] Figure 11 This is a detailed flowchart illustrating an anomaly warning method performed by an overcurrent detection device according to some other embodiments of this application;

[0052] Figure 12 This is a schematic diagram showing the correspondence between the sampling sequence number difference and the sampling data of an overcurrent detection device according to some embodiments of this application;

[0053] Figure 13This is a diagram illustrating the application environment of a protection device according to some embodiments of this application;

[0054] Figure 14 This is a schematic diagram of the structure of a protection device according to some embodiments of this application;

[0055] Figure 15 This is a schematic diagram of the specific structure of the protection device according to some embodiments of this application;

[0056] Figure 16 This is an application environment diagram of a three-out-of-two protection device according to some other embodiments of this application;

[0057] Figure 17 This is a schematic diagram of the structure of a three-out-of-two protection device according to some other embodiments of this application;

[0058] Figure 18 This is a schematic diagram of the specific structure of a three-out-of-two protection device according to some other embodiments of this application;

[0059] Figure 19 A flowchart illustrating an anomaly warning method performed by a protection device according to some embodiments of this application; and

[0060] Figure 20 This is a flowchart illustrating an abnormality warning method performed by a three-out-of-two protection device according to some other embodiments of this application. Detailed Implementation

[0061] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0064] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0067] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0068] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0069] The accuracy of overcurrent detection results in energy storage valve control systems is crucial to the stable operation of converter valves. During daily operation, overcurrent detection devices in energy storage valve control systems may experience issues such as communication interruptions, program crashes, or abnormal shutdowns, thus affecting the overcurrent detection results for converter valves. Currently, overcurrent detection devices and two-out-of-three protection devices are used to independently determine protection actions, sample values, and provide early warnings. However, this approach relies on isolated vertical judgments along the data flow direction, only considering the comparison between the protection settings of a single overcurrent detection device and real-time analog quantities, resulting in an insufficiently comprehensive early warning strategy. The inventors have addressed this by adding horizontal data comparisons between overcurrent detection devices, enabling early warnings for abnormally operating overcurrent detection devices and thus improving the early warning strategy in energy storage valve control systems.

[0070] Currently, the new energy storage valve control system, in accordance with the "Technical Specification for Flexible DC Energy Storage Device of Zhangbei ±35kV DC Energy Storage Project," has put forward the following normative requirements: valve-controlled overcurrent protection and valve-controlled imbalance protection should be designed according to the "two out of three" principle. Figure 1 As shown, the system includes a first valve protection unit 100, a second valve protection unit 110, a third valve protection unit 120, a first protection 2-out-of-3 unit 130, a second protection 2-out-of-3 unit 140, a first valve control unit 150, and a second valve control unit 160. The three valve protection units are configured independently in hardware. The first valve protection unit 100 samples data from the first measurement unit 170, the second valve protection unit 110 samples data from the second measurement unit 180, and the third valve protection unit 120 samples data from the third measurement unit 190. Each valve protection unit judges the sampled data and then sends the processed data to the corresponding protection 2-out-of-3 unit for logical judgment. The two protection 2-out-of-3 units operate independently, each sending the processed data to the corresponding valve control unit for unified processing by the valve control system. It should be noted that in the context, "valve protection unit" and "overcurrent detection device" refer to the same product, and are uniformly referred to as "valve protection unit" or "overcurrent detection device". Similarly, "protection 2-out-of-3 unit" and "protection 2-out-of-3 unit" refer to the same product, and are uniformly referred to as "protection 2-out-of-3 unit" or "protection 2-out-of-3 unit".

[0071] In traditional technologies, early warning systems for novel energy storage valve control systems typically consider only the longitudinal direction, comparing the protection settings of a single overcurrent detection device with real-time analog values. They neglect the comparison of data between different overcurrent detection devices, thus lacking a comprehensive early warning strategy for the valve control system. This is especially critical in the ultra-high voltage (UHV) energy storage field, where the reliability requirements for valve control systems are extremely stringent. The inventors have discovered that adding lateral early warning enhances the ability to provide real-time, instantaneous value warnings, improves multi-directional monitoring of bridge arm currents, and enhances the system's overall fault monitoring and early warning capabilities. This is of great significance for improving the reliability and safety of valve control systems.

[0072] Therefore, this application proposes a technical solution for lateral comparison of sampling data from multiple flow detection devices operating in parallel within an energy storage valve control system. This technical solution is applicable to valve control systems in engineering applications integrating AC / DC microgrid / distribution network technology and battery energy storage technology. It employs lateral data acquisition via overcurrent detection devices, compares data from the same time segment, and issues an early warning when the difference between any two data points exceeds a threshold.

[0073] This application proposes two technical solutions for horizontal early warning: One solution involves N overcurrent detection devices sharing data in a ring network, with any one overcurrent detection device acting as the master device. This master device compares its own data with the data from the other N-1 overcurrent detection devices to obtain data differences. When all differences exceed a corresponding threshold, the master device issues an early warning signal. The other solution involves uploading data from the N overcurrent detection devices to a protection device, which then compares these N data points horizontally to obtain data differences. When the data difference exceeds a corresponding threshold, the protection device issues an early warning signal. Please refer to [reference needed]. Figure 2 , Figure 2 This is a diagram illustrating the application environment of an overcurrent detection device according to some embodiments of this application. Figure 2 An N-to-M redundancy structure 200 as part of an energy storage valve control system is shown, where N represents the number of overcurrent detection devices, which is an integer greater than or equal to 3, and M is an integer less than N. The N-to-M redundancy structure 200 includes N overcurrent detection devices and one protection device. The N overcurrent detection devices operate in parallel, including a first overcurrent detection device 210, a second overcurrent detection device 220, ..., an Nth overcurrent detection device 230. The first overcurrent detection device 210 is adapted to sample a first measuring unit 250 to obtain a first current value, the second overcurrent detection device 220 is adapted to sample a second measuring unit 260 to obtain a second current value, ..., and the Nth overcurrent detection device 230 is adapted to sample a Nth measuring unit 270 to obtain an Nth current value. The protection device 240 is adapted to perform an N-to-M vote on the overcurrent detection results output by the first overcurrent detection devices 210 to the Nth overcurrent detection devices 230 and output the N-to-M vote result.

[0074] Compared to Figure 1The independent first valve protection unit 100, second valve protection unit 110, and third valve protection unit 120 shown in this embodiment are each communicatively connected to the other N-1 overcurrent detection devices, with any one of the first overcurrent detection devices 210 to the Nth overcurrent detection device 230 being communicatively connected to each other. For example, the first overcurrent detection device 210 to the Nth overcurrent detection device 230 can share data such as real-time sampled current values ​​and sampling sequence numbers between each other via the HSR (High-availability Seamless Redundancy) ring network protocol.

[0075] It is understood that the first overcurrent detection device 210 to the Nth overcurrent detection device 230 are overcurrent detection devices with the same configuration and performing the same function; they are named differently only for ease of description. The following discussion uses the first overcurrent detection device 210 as an example, combined with... Figure 3 The structure of the overcurrent detection device according to an embodiment of this application will be described.

[0076] like Figure 3 As shown, the first overcurrent detection device 210 includes a sampling unit 310, a transceiver unit 320, a difference calculation unit 330, and a warning output unit 340. The sampling unit 310 is configured to sample the first measurement unit 250 to obtain a first current value. In some examples, this current is an instantaneous value. The transceiver unit 320 is configured to receive second to Nth current values ​​sampled by each of the other N-1 overcurrent detection devices from the corresponding measurement unit; that is, to receive the second current value from the second overcurrent detection device 220, ..., and the Nth current value from the Nth overcurrent detection device 230. The transceiver unit 320 is also configured to send the first current value to the second to Nth overcurrent detection devices 220 and 230 respectively. The difference calculation unit 330 is configured to calculate the current difference between the first current value and the second to Nth current values, that is, to calculate the current difference between the first and second current values ​​to obtain the first current difference, to calculate the current difference between the first and third current values ​​to obtain the second current difference, and so on, until the current difference between the first and Nth current values ​​is calculated to obtain the (N-1)th current difference. It should be noted that the first to (N-1)th current differences are all absolute values ​​of instantaneous current differences. The warning output unit 340 is configured to output a first warning signal indicating an abnormality in the first overcurrent detection device 210 when the first to (N-1)th current differences are respectively greater than the first to (N-1)th difference threshold values ​​corresponding to the first to (N-1)th current differences.

[0077] In this embodiment, the first overcurrent detection device 210 can be considered as the main overcurrent detection device, while the second overcurrent detection device 220 to the Nth overcurrent detection device 230 can be considered as slave overcurrent detection devices. The main overcurrent detection device receives the current values ​​of the other N-1 slave overcurrent detection devices through the transceiver unit 320, calculates the current difference between the main overcurrent detection device and the N-1 slave overcurrent detection devices through the difference calculation unit 330, and realizes an abnormal warning for the main overcurrent detection device when all N-1 calculated current differences exceed the corresponding difference threshold value through the early warning output unit 340, thereby improving the reliability and safety of the valve control system.

[0078] In some embodiments, the difference calculation unit 330 is configured to calculate the current difference between the Kth current value (from the second current value to the Nth current value) and the remaining current values ​​(from the second current value to the Nth current value). The warning output unit 340 is configured to output a second warning signal indicating that the Kth overcurrent detection device sampled at the Kth current value is abnormal when only one of the first current difference to the (N-1)th current difference is greater than the corresponding difference threshold value. For example, when only the (K-1)th current difference between the first current value and the Kth current value is greater than the (K-1)th difference threshold value, while the remaining N-2 current differences between the first current difference to the (N-1)th current difference are less than or equal to the corresponding difference threshold values, and the current difference between the Kth current value and the remaining current values ​​(from the second current value to the Nth current value) is greater than the corresponding difference threshold value.

[0079] The aforementioned early warning output unit 340 can not only provide early warning of abnormalities for the first overcurrent detection device 210, but also provide early warning of abnormalities for the other N-1 overcurrent detection devices.

[0080] In some embodiments, time sections can be arranged according to the sampling period within a predetermined time period. For example... Figure 4 As shown, the first overcurrent detection device 210 may further include a storage unit 350 and a difference threshold calculation unit 360. The storage unit 350 is configured to store a first to Nth current value associated with a sampling sequence number at each time segment. The difference threshold calculation unit 360 is configured to enable the current rating value when a current rating value for the energy storage valve control system is set. The current rating value can be set manually. Further, the first to Nth current values ​​stored at each time segment are compared with a preset current range. If each of the first to Nth current values ​​is within the preset current range, then the current first to Nth current values ​​are confirmed to be usable in the calculation of the difference threshold value. The preset current range is determined based on the set current rating value; in some examples, it is denoted as I... n Taking the rated current as an example, the preset current range can be (1±20%)I. nFurthermore, the difference threshold calculation unit 360 calculates the first difference threshold value to the (N-1)th difference threshold value based on multiple first current values ​​to the Nth current value under multiple time sections, and calculates the difference threshold value of the Kth current value relative to the remaining current values ​​among the second current values ​​to the Nth current value.

[0081] The aforementioned storage unit 350 is further configured to store the first difference threshold value to the (N-1)th difference threshold value, and to store the difference threshold values ​​of the Kth current value relative to the remaining current values ​​among the second to Nth current values.

[0082] By dynamically calculating and updating the difference threshold value in real time through the difference threshold value calculation unit 360, it is possible to more accurately identify overcurrent detection devices whose sampling values ​​are abnormal compared to other overcurrent detection devices.

[0083] In some embodiments, the difference calculation unit 330 performs a horizontal comparison of the sampling sequence numbers under the same time section to obtain the sampling sequence number difference between any two of the N overcurrent detection devices. Further, based on the corresponding sampling sequence number difference, it calculates the first current difference between the first current value and the second current value, the second current difference between the first current value and the third current value, ..., the N-1th current difference between the first current value and the Nth current value, and calculates the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value. The same calculation is performed under other time sections.

[0084] The difference calculation unit 330 calculates the first current difference to the (N-1)th current difference under multiple time sections, so that the difference threshold calculation unit 360 can obtain a more reliable and accurate first difference threshold value, second difference threshold value and third difference threshold value accordingly.

[0085] In some embodiments, the difference calculation unit 330 calculates the average value of each of the first to N-1 current differences under different time segments, thereby obtaining typical values ​​of the first to N-1 differences; and calculates the average value of each current difference between the Kth current value and the remaining current values ​​from the second to Nth current values ​​under different time segments, thereby obtaining typical values ​​of the differences between the Kth current value and the remaining current values ​​from the second to Nth current values. When calculating the typical difference values, the number of time segments selected can be set according to the actual situation. In some examples, the first to N-1 current differences under 10 time segments can be used for calculation.

[0086] The difference threshold calculation unit 360 obtains a preset threshold coefficient, and then multiplies each typical difference value by the preset threshold coefficient to determine the corresponding difference threshold value. Specifically, the preset threshold coefficient can be set manually according to actual needs, and its value is greater than 1. In some examples, the typical value of the threshold coefficient is 1.2.

[0087] To illustrate the technical solution of this application regarding the overcurrent detection device in more detail, the following will use... Figure 2 The technical solution of this application will be described in detail using the N-out-of-M redundancy structure 200 as an example of a three-out-of-two redundancy structure. It can be understood that when the N-out-of-M redundancy structure is taken as a three-out-of-two redundancy structure, the protection device will perform three-out-of-two logic on the overcurrent detection result.

[0088] Please refer to Figure 5 , Figure 5 This is an application environment diagram of an overcurrent detection device according to some other embodiments of this application. Figure 5 A 2-out-of-3 redundancy structure 500 as part of an energy storage valve control system is shown. The 2-out-of-3 redundancy structure 500 includes three overcurrent detection devices and one 2-out-of-3 protection device 540. The three overcurrent detection devices operate in parallel and include a first overcurrent detection device 510, a second overcurrent detection device 520, and a third overcurrent detection device 530. The first overcurrent detection device 510 is adapted to sample a first measuring unit 550 to obtain a first current value, the second overcurrent detection device 520 is adapted to sample a second measuring unit 560 to obtain a second current value, and the third overcurrent detection device 530 is adapted to sample a third measuring unit 570 to obtain a third current value. The 2-out-of-3 protection device 540 is adapted to perform a 2-out-of-3 vote on the overcurrent detection results output by the first overcurrent detection device 510, the second overcurrent detection device 520, and the third overcurrent detection device 530 and output the 2-out-of-3 vote result.

[0089] In this embodiment, any one of the first overcurrent detection device 510, the second overcurrent detection device 520, and the third overcurrent detection device 530 is communicatively connected to the other two overcurrent detection devices. For example, the first overcurrent detection device 510, the second overcurrent detection device 520, and the third overcurrent detection device 530 can share data such as real-time sampled current values ​​and sampling sequence numbers between each other through the HSR ring network protocol.

[0090] The following uses the first overcurrent detection device 510 as an example, combined with... Figure 6 The structure of the overcurrent detection device according to an embodiment of this application will be described.

[0091] like Figure 6As shown, the first overcurrent detection device 510 includes a sampling unit 610, a transceiver unit 620, a difference calculation unit 630, a warning output unit 640, and a storage unit 650. The sampling unit 610 is configured to sample the first measurement unit 550 to obtain a first current value. In some examples, this current is an instantaneous value. The transceiver unit 620 is configured to receive a second current value from the second overcurrent detection device 520 and a third current value from the third overcurrent detection device 530. The transceiver unit 620 is also configured to transmit the first current value to the second overcurrent detection device 520 and the third overcurrent detection device 530. The difference calculation unit 630 is configured to calculate a first current difference between the first current value and the second current value, and a second current difference between the first current value and the third current value. The first current difference can be the absolute value of the current difference between the first current value and the second current value, and the second current difference can also be the absolute value of the current difference between the first current value and the third current value. The warning output unit 640 is configured to output a first warning signal indicating an abnormality in the first overcurrent detection device when the first current difference is greater than a first difference threshold and the second current difference is greater than a second difference threshold. The storage unit 650 is configured to store the first current value, the second current value, and the third current value.

[0092] In this embodiment, the first overcurrent detection device 510 can be considered as the main overcurrent detection device, while the second overcurrent detection device 520 and the third overcurrent detection device 530 can be considered as slave overcurrent detection devices. The main overcurrent detection device receives the current values ​​of the two slave overcurrent detection devices through the transceiver unit 620, calculates the current difference between the main overcurrent detection device and the two slave overcurrent detection devices through the difference calculation unit 630, and realizes an abnormal warning for the main overcurrent detection device when both calculated current differences exceed the corresponding difference threshold value through the early warning output unit 640, thereby improving the reliability and safety of the valve control system.

[0093] In some embodiments, the difference calculation unit 630 is configured to calculate the absolute value of the current difference between the second current value and the third current value to obtain the third current difference. The warning output unit 640 is configured to output a second warning signal indicating an abnormality of the second overcurrent detection device 520, or a third warning signal indicating an abnormality of the third overcurrent detection device 530, based on the comparison relationship between the third current difference and the third difference threshold value, when only one of the first current difference and the second current difference is greater than the difference threshold value.

[0094] The aforementioned early warning output unit 640 can not only provide early warning of abnormalities for the first overcurrent detection device, but also provide early warning of abnormalities for the other two overcurrent detection devices.

[0095] In some embodiments, time segments can be arranged according to the sampling period within a predetermined time period. The storage unit 650 is configured to store a first current value, a second current value, and a third current value associated with a sampling sequence number in each time segment.

[0096] like Figure 7 As shown, the first overcurrent detection device 510 may further include a difference threshold calculation unit 660, which enables the current rating when it receives the setting of the rated current for the operation of the energy storage valve control system. Further, the first, second, and third current values ​​stored in each time segment are compared with a preset current range. If all three current values ​​are within the preset current range, then the current values ​​are confirmed to be usable in the calculation of the difference threshold. Further, the difference threshold calculation unit 660 calculates the first, second, and third difference thresholds based on multiple first, second, and third current values ​​across multiple time segments.

[0097] The aforementioned storage unit 650 is also configured to store a first difference threshold value, a second difference threshold value, and a third difference threshold value.

[0098] By dynamically calculating and updating the difference threshold value in real time through the difference threshold value calculation unit 660, it is possible to more accurately identify overcurrent detection devices whose sampling values ​​are abnormal compared to other overcurrent detection devices.

[0099] In some embodiments, the difference calculation unit 630 performs a horizontal comparison of the sampling sequence numbers under the same time section to obtain the sampling sequence number difference between any two of the three overcurrent detection devices. Further, based on the corresponding sampling sequence number difference, it calculates the first current difference between the first current value and the second current value, the second current difference between the first current value and the third current value, and the third current difference between the second current value and the third current value, respectively. The same calculation is performed under other time sections.

[0100] The difference threshold calculation unit 660 calculates the first difference threshold, the second difference threshold, and the third difference threshold based on the first current difference, the second current difference, and the third current difference at each time section.

[0101] The difference calculation unit 630 calculates the first current difference, the second current difference, and the third current difference under multiple time sections, so that the difference threshold calculation unit 360 can obtain more reliable and accurate first difference threshold, second difference threshold, and third difference threshold.

[0102] In some embodiments, the difference calculation unit 630 calculates the average value of the first current difference, the second current difference, and the third current difference at different time sections, respectively, to obtain the typical values ​​of the first difference, the second difference, and the third difference. When calculating the typical value of the difference, the number of time sections selected can be set according to the actual situation. In some examples, the first current difference, the second current difference, and the third current difference at 10 time sections can be used for calculation.

[0103] The difference threshold calculation unit 660 determines the first difference threshold, the second difference threshold, and the third difference threshold based on the first difference typical value, the second difference typical value, and the third difference typical value.

[0104] In some embodiments, the difference threshold calculation unit 660 obtains a preset threshold coefficient and then multiplies each typical difference value by the preset threshold coefficient to determine the corresponding difference threshold value.

[0105] In some embodiments, such as Figure 8 As shown, an anomaly early warning method is provided. This embodiment applies this method to... Figure 2 The N-to-M redundancy structure 200 in the energy storage valve control system shown is illustrated as an example.

[0106] The method is performed by any one of the first overcurrent detection device 210, the second overcurrent detection device 220 to the Nth overcurrent detection device 230. When the method is performed by the first overcurrent detection device 210, the method includes:

[0107] Step S110: Receive the second current value to the Nth current value from the second overcurrent detection device 220 to the Nth overcurrent detection device 230 respectively.

[0108] Step S120: Calculate the first current difference to the (N-1)th current difference, where the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value.

[0109] Specifically, the first current difference is the difference between the first current value and the second current value, the second current difference is the difference between the first current value and the third current value, and so on, with the (N-1)th current difference being the difference between the first current value and the Nth current value.

[0110] Step S130: When the first current difference to the (N-1)th current difference is greater than the first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, a first warning signal is output, indicating that the first overcurrent detection device 210 is abnormal.

[0111] Specifically, the first current difference is compared with the first difference threshold, the second current difference with the second difference threshold, ..., the (N-1)th current difference with the (N-1)th difference threshold. When each of the first current difference to the (N-1)th current difference is greater than the corresponding difference threshold, the first overcurrent detection device 210 is determined to be abnormal, outputs a first warning signal, and sends it to the monitoring backend to realize real-time warning.

[0112] In this implementation, any one overcurrent detection device is used as the main device. The main device receives current values ​​from N-1 other overcurrent detection devices laterally, thus obtaining the current difference between the main device and each of the N-1 overcurrent detection devices. These N-1 current differences are then compared to their corresponding threshold values. If all N-1 current differences exceed the threshold value, an anomaly warning is issued to the main overcurrent detection device. Therefore, by comparing the sampling data from each overcurrent detection device, a lateral warning is achieved, improving the reliability and safety of the valve control system.

[0113] In some embodiments, such as Figure 9 As shown, the method further includes:

[0114] Step S140: Calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value.

[0115] Specifically, the current difference between the Kth current value and the second current value, the current difference between the Kth current value and the third current value are calculated respectively, and so on, until the current difference between the Kth current value and the Nth current value is calculated.

[0116] Step S150: When the (K-1)th current difference among the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, and the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and each of the remaining current values ​​among the second current value to the Nth current value is greater than the corresponding difference threshold, a second warning signal is output, indicating that the Kth overcurrent detection device is abnormal.

[0117] Specifically, when the (K-1)th current difference between the first current value and the Kth current value is greater than the (K-1)th difference threshold, and the remaining N-2 current differences from the first current difference to the (N-1)th current difference are less than or equal to the corresponding difference threshold, and the current differences between the Kth current value and the remaining current values ​​from the second current value to the Nth current value are each greater than the corresponding difference threshold, a second warning signal indicating that the Kth overcurrent detection device is abnormal is output.

[0118] In this embodiment, if the current difference between any overcurrent detection device and only one other overcurrent detection device is greater than the corresponding difference threshold, the current difference between the other N-1 overcurrent detection devices is compared with the corresponding difference threshold, thereby achieving an abnormal warning for the other N-1 overcurrent detection devices.

[0119] In some embodiments, time segments can be arranged according to the sampling period within a predetermined time period, and a first current value to the Nth current value associated with the sampling sequence number can be stored in each time segment. Further, multiple first current values ​​to the Nth current values ​​in multiple time segments can be stored.

[0120] When the first overcurrent detection device 210 receives the setting of the rated current for the operation of the energy storage valve control system, it enables the rated current. Further, it compares the first to Nth current values ​​stored at each time segment with a preset current range. If each of the first to Nth current values ​​is within the preset current range, it confirms that the current first to Nth current values ​​can be used in the calculation of the difference threshold value.

[0121] Compared to using a pre-set value or a value manually set based on historical data as the difference threshold between overcurrent detection devices, the embodiments of this application can more accurately identify overcurrent detection devices that are abnormal relative to the sampling values ​​of other overcurrent detection devices by dynamically calculating and updating the difference threshold in real time.

[0122] In some embodiments, the steps of calculating the first difference threshold value to the (N-1)th difference threshold value and calculating the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value include: performing a horizontal comparison of the sampling sequence numbers under the same time segment to obtain the sampling sequence number difference between any two of the N overcurrent detection devices; further, based on the corresponding sampling sequence number difference, calculating the first current difference value to the (N-1)th current difference value between the first current value and the second current value to the Nth current value, and calculating the current difference value between the Kth current value and the remaining current values ​​from the second current value to the Nth current value, and so on for other time segments.

[0123] Furthermore, based on the first current difference to the (N-1)th current difference under different time sections, the first difference threshold value to the (N-1)th difference threshold value are calculated; and based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value under different time sections, the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value are calculated.

[0124] In some embodiments, the step of processing the first current difference to the (N-1)th current difference in each time segment to obtain the first difference threshold value to the (N-1)th difference threshold value includes: calculating the average value of each of the multiple first current differences to the multiple (N-1)th current differences in multiple time segments to obtain the first difference typical value to the (N-1)th difference typical value; further, multiplying each of the first difference typical value to the (N-1)th difference typical value by a preset threshold coefficient to obtain the first difference threshold value to the (N-1)th difference threshold value.

[0125] The step of calculating the threshold values ​​of the differences between the Kth current value and the remaining current values ​​from the second to the Nth current value based on the current differences between the Kth current value and the remaining current values ​​from the second to the Nth current value at each time segment includes: calculating the average values ​​corresponding to the current differences between the Kth current value and the remaining current values ​​from the second to the Nth current value at multiple time segments to obtain typical values ​​of the differences between the Kth current value and the remaining current values ​​from the second to the Nth current value; further, multiplying the typical values ​​of the differences between the Kth current value and the remaining current values ​​from the second to the Nth current value by a preset threshold coefficient to obtain the threshold values ​​of the differences between the Kth current value and the remaining current values ​​from the second to the Nth current value.

[0126] In other embodiments, such as Figure 10 As shown, an anomaly early warning method is provided. This embodiment applies this method to... Figure 5 The three-out-of-two redundancy structure 500 in the energy storage valve control system shown is illustrated as an example.

[0127] The method is performed by any one of the first overcurrent detection device 510, the second overcurrent detection device 520, and the third overcurrent detection device 530. When the method is performed by the first overcurrent detection device 510, the method includes:

[0128] In step S210, the second current value and the third current value are received from the second overcurrent detection device 520 and the third overcurrent detection device 530, respectively.

[0129] Specifically, the first overcurrent detection device 510 can receive, in real time, the second current value sent by the second overcurrent detection device 520 and the third current value sent by the third overcurrent detection device 530 at the same time segment. In some examples, the first current value, the second current value, and the third current value are all instantaneous current values.

[0130] Step S220: Calculate the first current difference between the first current value and the second current value; calculate the second current difference between the first current value and the third current value;

[0131] Specifically, the first current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 510 and the second overcurrent detection device 520, and the second current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 510 and the third overcurrent detection device 530.

[0132] In step S230, when the first current difference is greater than the first difference threshold and the second current difference is greater than the second difference threshold, a first warning signal is output, indicating that the first overcurrent detection device 510 is abnormal.

[0133] Specifically, the first difference threshold is the current difference threshold between the first overcurrent detection device 510 and the second overcurrent detection device 520, and the second difference threshold is the current difference threshold between the first overcurrent detection device 510 and the third overcurrent detection device 530. By comparing the first current difference between the first overcurrent detection device 510 and the second overcurrent detection device 520 with the corresponding first difference threshold, and by comparing the second current difference between the first overcurrent detection device 510 and the third overcurrent detection device 530 with the corresponding second difference threshold, abnormal overcurrent detection devices can be detected based on the comparison results.

[0134] When the first current difference is greater than the first difference threshold and the second current difference is greater than the second difference threshold, the first overcurrent detection device 510 is determined to be abnormal, outputs the first warning signal, and sends it to the monitoring backend to realize real-time warning.

[0135] In this implementation, any one overcurrent detection device is used as the main device. The main device receives current values ​​from two other overcurrent detection devices laterally, thus obtaining the current difference between the main device and each of the other two overcurrent detection devices. These two current differences are then compared to corresponding threshold values. If both current differences exceed the threshold values, an anomaly warning is issued to the main overcurrent detection device. Therefore, by comparing the sampling data from each overcurrent detection device, a lateral warning is achieved, improving the reliability and safety of the valve control system.

[0136] In some embodiments, such as Figure 11 As shown, the method further includes:

[0137] Step S240: Calculate the third current difference between the second current value and the third current value.

[0138] Specifically, the third current difference is the absolute value of the instantaneous current difference between the second overcurrent detection device 520 and the third overcurrent detection device 530.

[0139] Step S250: When the first current difference is greater than the first difference threshold, the second current difference is less than or equal to the second difference threshold, and the third current difference is greater than the third difference threshold, a second warning signal is output, indicating that the second overcurrent detection device 520 is abnormal.

[0140] Specifically, the third difference threshold is the current difference threshold between the second overcurrent detection device 520 and the third overcurrent detection device 530. When the first current difference is greater than the first difference threshold and the second current difference is less than or equal to the second difference threshold, the third current difference between the second overcurrent detection device 520 and the third overcurrent detection device 530 is further compared with the corresponding third difference threshold. When the third current difference is greater than the third difference threshold, it is determined that the second overcurrent detection device 520 is abnormal, and a second warning signal is output, which indicates that the second overcurrent detection device 520 is abnormal.

[0141] In step S260, when the first current difference is less than or equal to the first difference threshold, the second current difference is greater than the second difference threshold, and the third current difference is greater than the third difference threshold, a third warning signal is output, indicating that the third overcurrent detection device 530 is abnormal.

[0142] Specifically, when the first current difference is less than or equal to the first difference threshold and the second current difference is greater than the second difference threshold, the third current difference between the third overcurrent detection device 530 and the second overcurrent detection device 520 is further compared with the corresponding third difference threshold. When the third current difference is greater than the third difference threshold, it is determined that the third overcurrent detection device 530 is abnormal and a third warning signal is output, which indicates that the third overcurrent detection device 530 is abnormal.

[0143] By comparing the current difference between any one overcurrent detection device and another overcurrent detection device with the corresponding difference threshold value, and then comparing the current difference between the other two overcurrent detection devices with the corresponding difference threshold value, it is possible to provide abnormal warnings for the other two overcurrent detection devices when any one overcurrent detection device is the main device.

[0144] The three overcurrent detection devices mentioned above all adopt asynchronous sampling mode. The crystal oscillator and power-on time of each overcurrent detection device are different. Therefore, under the same time segment, the message sequence number sent by each device will be different, that is, the sampling sequence number is different. Under normal circumstances, the deviation between the sampling sequence numbers under different time segments remains unchanged.

[0145] In some embodiments, time segments can be arranged according to the sampling period within a predetermined time period, and a first current value, a second current value, and a third current value associated with the sampling sequence number can be stored under each time segment. Further, multiple first current values, multiple second current values, and multiple third current values ​​under multiple time segments can be stored. In some examples, when a corresponding sampling sequence number cannot be found based on the sampling sequence number deviation value, the result is sent to the monitoring backend after judgment, achieving real-time early warning.

[0146] When the first overcurrent detection device 510 receives the current rating setting for the energy storage valve control system, it enables the current rating. The current rating setting can be done manually. Further, the first, second, and third current values ​​stored at each time segment are compared with a preset current range. If all three current values ​​are within the preset current range, then the current first, second, and third current values ​​are confirmed to be usable in the calculation of the difference threshold value.

[0147] In some embodiments, the steps of calculating the first difference threshold, the second difference threshold, and the third difference threshold include: performing a horizontal comparison of the sampling sequence numbers at the same time cross-section to obtain the difference in sampling sequence numbers between any two of the three overcurrent detection devices, such as... Figure 12 As shown, a schematic diagram illustrating the correspondence between the sampling sequence number and the sampling data of the overcurrent detection device is provided. Here, △n1 represents the sampling sequence number difference between the first sampling sequence number corresponding to the first overcurrent detection device 510 and the second sampling sequence number corresponding to the second overcurrent detection device 520; △n2 represents the sampling sequence number difference between the second sampling sequence number corresponding to the second overcurrent detection device 520 and the third sampling sequence number corresponding to the third overcurrent detection device 530; and △n3 represents the sampling sequence number difference between the first sampling sequence number corresponding to the first overcurrent detection device 510 and the third sampling sequence number corresponding to the third overcurrent detection device 530. Further, based on the corresponding sampling sequence number differences, the first current difference △1, the second current difference △2, and the third current difference △3 between the first and third current values ​​are calculated respectively. The same calculation is performed for other time segments. Further, the first current difference, the second current difference, and the third current difference are processed for each time segment to obtain the first difference threshold value, the second difference threshold value, and the third difference threshold value.

[0148] By accumulating the first current difference, the second current difference, and the third current difference at multiple time sections, more reliable first difference threshold values, second difference threshold values, and third difference threshold values ​​can be obtained accordingly.

[0149] In some embodiments, the step of processing the first current difference, the second current difference, and the third current difference at each time segment to obtain the first difference threshold value, the second difference threshold value, and the third difference threshold value includes: calculating the average value of the first current difference, the second current difference, and the third current difference at different time segments to obtain the typical value of the first difference, the typical value of the second difference, and the typical value of the third difference, thereby determining the corresponding difference threshold value based on the typical value of each difference.

[0150] In some embodiments, the step of determining the first difference threshold value, the second difference threshold value, and the third difference threshold value based on the first difference typical value, the second difference typical value, and the third difference typical value includes: multiplying each difference typical value by a preset threshold coefficient to determine the corresponding difference threshold value.

[0151] Once each difference threshold value is determined, it is written to flash memory and will not be lost when power is off. Each difference threshold value is only updated when the enable command for the current rating is updated.

[0152] By supplementing each typical difference value with a preset threshold coefficient, a more accurate difference threshold value can be obtained, thus improving the reliability of each difference threshold value.

[0153] When three overcurrent detection devices in the 3-out-of-2 redundant structure 500 simultaneously execute the above-mentioned abnormal warning method, all warnings will adopt an instantaneous alarm and delayed return strategy. The delay time can be set according to actual needs. In some examples, it is generally set to the time interval of three sampling data of the three overcurrent detection devices. The purpose of delayed return is to avoid sampling data fluctuations, repeated alarms and increased CPU load inside the device.

[0154] The above-mentioned abnormal early warning method achieves real-time early warning of abnormal overcurrent detection devices by sharing horizontal data among three overcurrent detection devices and comparing the horizontal data by any one of the overcurrent detection devices. Compared with the traditional technology that relies solely on vertical data comparison in the valve control system for early warning, this application makes the early warning strategy in the new energy storage valve control system more complete, enhances the reliability of the system, and improves the ability to monitor and warn of faults.

[0155] Please refer to Figure 13 , Figure 13 This is an application environment diagram of a protection device according to some embodiments of this application. Figure 13A squared-N-M redundancy structure 700 as part of an energy storage valve control system is shown, where N represents the number of overcurrent detection devices, which is an integer greater than or equal to 3, and M is an integer less than N. The squared-N-M redundancy structure 700 includes N overcurrent detection devices and two protection devices. The N overcurrent detection devices operate in parallel, including a first overcurrent detection device 710, a second overcurrent detection device 720, ..., an Nth overcurrent detection device 730. The two protection devices operate in parallel, including a first protection device 770 and a second protection device 780. The first overcurrent detection device 710 is adapted to sample a first measuring unit 740 to obtain a first current value, the second overcurrent detection device 720 is adapted to sample a second measuring unit 750 to obtain a second current value, and so on, with the Nth overcurrent detection device 730 adapted to sample an Nth measuring unit 760 to obtain an Nth current value. Each of the two protection devices performs an N-out-of-M vote on the overcurrent detection results output by the first overcurrent detection device 710 to the Nth overcurrent detection device 730 and outputs the N-out-of-M vote result. The two protection devices are communicatively connected to each other. It can be understood that the 2xN-out-of-M redundancy structure 700 can be regarded as including two N-out-of-M redundancy structures as described above, wherein the two N-out-of-M redundancy structures reuse N overcurrent detection devices.

[0156] It is understood that the first protection device 770 and the second protection device 780 are protection devices with the same configuration and performing the same function; their different names are merely for ease of description. The following discussion uses the first protection device 770 as an example, combined with... Figure 14 The structure of the protection device according to an embodiment of this application will be described.

[0157] like Figure 14 As shown, the first protection device 770 may include a receiving unit 810, a difference calculation unit 820, and a warning output unit 830. The receiving unit 810 is configured to receive, at the same time segment, the first current value of the first overcurrent detection device 710, the second current value of the second overcurrent detection device 720, ..., the Nth current value of the Nth overcurrent detection device 730. The difference calculation unit 820 is configured to calculate the current difference between the first and second current values ​​to obtain the first current difference value, and to calculate the current difference between the first and third current values ​​to obtain the second current difference value, and so on, calculating the current difference between the first and Nth current values ​​to obtain the (N-1)th current difference value. The warning output unit 830 is configured to output a first warning signal indicating an abnormality in the first overcurrent detection device 710 when each of the first to (N-1)th current differences is greater than the corresponding first to (N-1)th difference threshold values.

[0158] The aforementioned protection device receives current values ​​from N overcurrent detection devices via receiving unit 810. Then, using the first current value as a reference, the difference calculation unit 820 calculates the first current difference to the (N-1)th current difference between the first current value and the other N-1 current values. The warning output unit 830 compares the first current difference to the (N-1)th current difference with the corresponding difference threshold value. When all N-1 current differences exceed the corresponding difference threshold value, an abnormal warning is issued to the first overcurrent detection device 710.

[0159] The functional limitations of each structural unit in the protection device in the following embodiments are similar to the functional limitations of the corresponding structural units in the first overcurrent detection device 210 described above, and will not be repeated here.

[0160] In some embodiments, the difference calculation unit 820 is configured to calculate the current difference between the Kth current value (from the second current value to the Nth current value) and the remaining current values ​​(from the second current value to the Nth current value). The warning output unit is configured to output a second warning signal when the (K-1)th current difference (from the first current difference to the (N-1)th current difference) is greater than the (K-1)th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current difference between the Kth current value and the remaining current values ​​(from the second current value to the Nth current value) is greater than the corresponding difference threshold value. The second warning signal indicates that the Kth overcurrent detection device is malfunctioning.

[0161] When only one current difference among the first to N-1 current differences is greater than the difference threshold, for example, when only the K-1 current difference is greater than the K-1 difference threshold, the warning output unit 830 compares the current difference between the K-th current value and the remaining current values ​​among the second to N-th current values ​​with the corresponding difference threshold, thereby realizing an abnormal warning for the second overcurrent detection device 720 to the N-th overcurrent detection device 730.

[0162] In some embodiments, such as Figure 15As shown, the first protection device 770 further includes a storage unit 840 and a difference threshold calculation unit 850. The storage unit 840 includes N buffers, which respectively store the received first to Nth current values. In addition, the storage unit 840 can also store the sampling sequence number of each overcurrent detection device. The storage unit 840 is configured to store multiple first to Nth current values ​​associated with the sampling sequence number within a predetermined time period including multiple time segments. The difference threshold calculation unit 850 is configured to calculate, based on the stored multiple first to Nth current values, a first difference threshold value to a difference threshold value of (N-1)th current value, and to calculate the difference threshold values ​​of the Kth current value relative to the remaining current values ​​of the second to Nth current values, when each of the stored multiple first to Nth current values ​​is within a preset current range. The storage unit 840 is also configured to store all difference threshold values.

[0163] In some embodiments, the difference calculation unit 820 is configured to calculate, according to the corresponding sampling sequence number, the first current difference to the (N-1)th current difference between the stored first current value and the stored second current value to the Nth current value at each time segment within a predetermined time period, and to calculate the current difference between the Kth current value among the stored second current value to the Nth current value and the remaining current values ​​among the second current value to the Nth current value.

[0164] The difference threshold calculation unit 850 is configured to calculate the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value in each time segment; and to calculate the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value in each time segment.

[0165] In some embodiments, the difference calculation unit 820 is configured to calculate the average value of each of a plurality of first current differences to a plurality of (N-1)th current differences under a plurality of time sections to obtain typical values ​​of the first difference to the (N-1)th difference; and to calculate the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value under a plurality of time sections to obtain typical values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value.

[0166] The difference threshold calculation unit 850 is configured to calculate the product of the first difference typical value to the (N-1)th difference typical value and the preset threshold coefficient to obtain the first difference threshold value to the (N-1)th difference threshold value; and to calculate the product of the difference typical value of the Kth current value relative to the other current values ​​from the second current value to the Nth current value and the preset threshold coefficient to obtain the difference threshold value of the Kth current value relative to the other current values ​​from the second current value to the Nth current value.

[0167] To illustrate the technical solution of the protection device in this application in more detail, the following will use... Figure 13 The 2xN-out-of-M redundancy structure 700 is a 2x3-out-of-2 redundancy structure. The protection device is taken as an example of a 3x2-out-of-2 protection device. The technical solution of this application is described in detail below.

[0168] Please refer to Figure 16 , Figure 16 This is an application environment diagram of a three-out-of-two protection device according to some other embodiments of this application. Figure 16 A 2x3 redundancy structure 900 as part of an energy storage valve control system is shown. The 2x3 redundancy structure 900 includes three overcurrent detection devices and two 3x2 protection devices. The three overcurrent detection devices operate in parallel, including a first overcurrent detection device 910, a second overcurrent detection device 920, and a third overcurrent detection device 930. The two 3x2 protection devices operate in parallel, including a first 3x2 protection device 970 and a second 3x2 protection device 980. The first overcurrent detection device 910 is adapted to sample a first measuring unit 940 to obtain a first current value, the second overcurrent detection device 920 is adapted to sample a second measuring unit 950 to obtain a second current value, and the third overcurrent detection device 930 is adapted to sample a third measuring unit 960 to obtain a third current value. Each of the two 3x2 protection devices performs a 3x2 vote on the overcurrent detection results output by the first overcurrent detection device 910, the second overcurrent detection device 920, and the third overcurrent detection device 930 and outputs the 3x2 vote result. The two 3-out-of-2 protection devices are communicatively connected to each other. It can be understood that the 2x3-out-of-2 redundancy structure 900 can be regarded as including two 3-out-of-2 redundancy structures as described above, wherein the two 3-out-of-2 redundancy structures reuse three overcurrent detection devices.

[0169] The following example uses the first three-out-of-two protection device 970, combined with... Figure 17 The structure of the three-out-of-two protection device according to an embodiment of this application will be described.

[0170] like Figure 17As shown, the first three-out-of-two protection device 970 may include a receiving unit 901, a difference calculation unit 902, a warning output unit 903, and a storage unit 904. The receiving unit 901 is configured to receive, simultaneously, the first current value of the first overcurrent detection device 910, the second current value of the second overcurrent detection device 920, and the third current value of the third overcurrent detection device 930. The storage unit 904 includes three buffers, which respectively store the received first, second, and third current values. In addition, the storage unit 904 may also store the sampling sequence number of each overcurrent detection device.

[0171] The difference calculation unit 902 is configured to calculate the absolute value of the current difference between the first current value and the second current value to obtain the first current difference, and to calculate the absolute value of the current difference between the first current value and the third current value to obtain the second current difference.

[0172] The warning output unit 903 is configured to output a first warning signal indicating that the first overcurrent detection device 910 is abnormal when the first current difference is greater than the first difference threshold and the second current difference is greater than the second difference threshold.

[0173] The aforementioned three-out-of-two protection device receives the current values ​​of three overcurrent detection devices through the receiving unit 901, and then uses the difference calculation unit 902 to obtain the first current difference and the second current difference between the first current value and the other two sampled values ​​based on the first current value. The warning output unit 903 compares the first current difference and the second current difference with the corresponding difference threshold value, and when both current differences exceed the corresponding difference threshold value, it realizes the abnormal warning for the first overcurrent detection device 910.

[0174] The functional limitations of each structural unit in the three-out-of-two protection device in the following embodiments are similar to the functional limitations of the corresponding structural units in the first overcurrent detection device 510 described above, and will not be repeated here.

[0175] In some embodiments, the difference calculation unit 902 is configured to calculate a third current difference between the second current value and the third current value.

[0176] The warning output unit 903 is configured to output a second warning signal when the first current difference is greater than the first difference threshold, the second current difference is less than or equal to the second difference threshold, and the third current difference is greater than the third difference threshold, indicating that the second overcurrent detection device 920 is abnormal; it is also configured to output a third warning signal when the first current difference is less than or equal to the first difference threshold, the second current difference is greater than the second difference threshold, and the third current difference is greater than the third difference threshold, indicating that the third overcurrent detection device 930 is abnormal.

[0177] When only one of the first current difference and the second current difference is greater than the difference threshold, the early warning output unit 903 compares the third current difference with the third difference threshold to realize the abnormality warning of the second overcurrent detection device 920 and the third overcurrent detection device 930.

[0178] In some embodiments, the storage unit 904 is configured to store a plurality of first current values, a plurality of second current values, and a plurality of third current values ​​associated with a sampling sequence number within a predetermined time period.

[0179] like Figure 18 As shown, the first three-out-of-two protection device 970 also includes a difference threshold value calculation unit 905, which is configured to calculate a first difference threshold value, a second difference threshold value and a third difference threshold value based on the stored multiple first current values, multiple second current values ​​and multiple third current values ​​when each of the stored multiple first current values, multiple second current values ​​and multiple third current values ​​is within a preset current range.

[0180] Storage unit 904 is configured to store a first difference threshold value, a second difference threshold value, and a third difference threshold value.

[0181] In some embodiments, the difference calculation unit 902 is configured to calculate, according to the corresponding sampling sequence number, the first current difference between the stored first current value and the second current value, the second current difference between the first current value and the third current value, and the third current difference between the second current value and the third current value at each time segment within a predetermined time period.

[0182] The difference threshold calculation unit 905 is configured to calculate the first difference threshold, the second difference threshold, and the third difference threshold based on the first current difference, the second current difference, and the third current difference at each time segment.

[0183] In some embodiments, the difference calculation unit 902 is configured to calculate the average of multiple first current differences under multiple time sections to obtain a first difference typical value; calculate the average of multiple second current differences under multiple time sections to obtain a second difference typical value; and calculate the average of multiple third current differences under multiple time sections to obtain a third difference typical value.

[0184] The difference threshold calculation unit 905 is configured to calculate the product of a first difference typical value and a preset threshold coefficient to obtain a first difference threshold value; calculate the product of a second difference typical value and a preset threshold coefficient to obtain a second difference threshold value; and calculate the product of a third difference typical value and a preset threshold coefficient to obtain a third difference threshold value.

[0185] In some embodiments, such as Figure 19As shown, an anomaly early warning method with a protection device as the main execution body is provided. This embodiment applies this method to... Figure 13 The example shown is an N-squared M-redundancy structure 700 in the energy storage valve control system. The solution provided by this method is similar to the one described above. Figure 8 The implementation scheme is similar to that described in the abnormal early warning method with the first overcurrent detection device 210 as the execution subject. Therefore, the specific limitations in the embodiments provided below can be found in the limitations of the above method, and will not be repeated here.

[0186] The method is performed by either of the two protection devices. When performed by the first protection device 770, the method includes:

[0187] Step S310: Receive the first current value to the Nth current value from the first overcurrent detection device 710 to the Nth overcurrent detection device 730 respectively.

[0188] Specifically, the first protection device 770 includes N buffers, each storing the real-time current values ​​and sampling numbers of N overcurrent detection devices. Therefore, at the same time point, the first protection device 770 receives the first current value from the first overcurrent detection device 710, the second current value from the second overcurrent detection device 720, and the Nth current value from the Nth overcurrent detection device 730, and stores the first to Nth current values ​​in their respective buffers. In some examples, the first to Nth current values ​​are all instantaneous current values.

[0189] Step S320: Calculate the first current difference to the (N-1)th current difference, where the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value.

[0190] Step S330: When the first current difference to the (N-1)th current difference is greater than the first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, a first warning signal is output, indicating that the first overcurrent detection device 710 is abnormal.

[0191] The above-mentioned abnormal warning method uses the first protection device 770 as the main device, which receives the current values ​​of N overcurrent detection devices respectively. Based on the first current value, the current difference between the first current value and the other N-1 current values ​​is obtained. Then, the current difference from the first current difference to the N-1th current difference is compared with the corresponding difference threshold value. When all N-1 current differences exceed the corresponding difference threshold value, the first overcurrent detection device 710 corresponding to the first current value is given an abnormal warning. Similarly, the horizontal warning is achieved by comparing the sampling data between each overcurrent detection device.

[0192] In some embodiments, the method further includes: calculating the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; and when the (K-1)th current difference from the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold value, the remaining N-2 current differences are less than or equal to the corresponding difference threshold values, and the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold value, outputting a second warning signal, the second warning signal indicating that the Kth overcurrent detection device is abnormal.

[0193] In some embodiments, the method further includes: storing a plurality of first current values ​​to Nth current values ​​in association with sampling sequence numbers within a predetermined time period including a plurality of time segments; and when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range, calculating a first difference threshold value to N-1 difference threshold value based on the stored plurality of first current values ​​to Nth current values, and calculating each difference threshold value of the Kth current value relative to the remaining current values ​​among the second current values ​​to Nth current values.

[0194] In some embodiments, calculating the first difference threshold value to the (N-1)th difference threshold value, and calculating the difference threshold values ​​of the Kth current value relative to the remaining current values ​​among the second to Nth current values, includes: at each time segment within a predetermined time period, calculating the first current difference value to the (N-1)th current difference value between the stored first current value and the stored second to Nth current values ​​according to the corresponding sampling sequence number, and calculating the current difference values ​​between the Kth current value and the remaining current values ​​among the stored second to Nth current values; calculating the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value at each time segment; and calculating the difference threshold values ​​of the Kth current value relative to the remaining current values ​​among the second to Nth current values ​​based on the current difference values ​​between the Kth current value and the remaining current values ​​among the second to Nth current values ​​at each time segment.

[0195] In some embodiments, based on the first current difference to the (N-1)th current difference in each time segment, a first difference threshold value to the (N-1)th difference threshold value are calculated; and based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value in each time segment, a difference threshold value is calculated for each of the multiple first current differences to the multiple (N-1)th current differences, including: calculating the average of each of the multiple first current differences to the multiple (N-1)th current differences in multiple time segments to obtain the first difference typical value to the (N-1)th difference typical value; calculating the first difference typical value to the... The product of the (N-1)th typical difference value and the preset threshold coefficient yields the first difference threshold value to the (N-1)th difference threshold value; the average values ​​corresponding to the current differences between the Kth current value and the remaining current values ​​from the second current value to the Nth current value are calculated one-to-one under multiple time sections to obtain the typical difference values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value; and the product of the typical difference values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient is calculated to obtain the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

[0196] In other embodiments, such as Figure 20 As shown, an anomaly early warning method is provided, and the solution to the problem provided by this method is the same as that described above. Figure 10 The implementation scheme is similar to that described in the abnormal warning method with the first overcurrent detection device 510 as the execution subject. Therefore, the specific limitations in the embodiments provided below can be referred to the limitations of the above method, and will not be repeated here.

[0197] This embodiment applies the method to... Figure 16 The 2x3-out-of-2 redundancy structure 900 in the energy storage valve control system is illustrated as an example, wherein the method is executed by either of the two 3x2 protection devices. When executed by the first 3x2 protection device 970, the method includes:

[0198] In step S410, a first current value, a second current value, and a third current value are received from the first overcurrent detection device 910, the second overcurrent detection device 920, and the third overcurrent detection device 930, respectively.

[0199] Specifically, the first three-out-of-two protection device 970 includes three buffers, which respectively store the real-time current values ​​and sampling numbers of the three overcurrent detection devices. Therefore, at the same time segment, the first three-out-of-two protection device 970 receives the first current value of the first overcurrent detection device 910, the second current value of the second overcurrent detection device 920, and the third current value of the third overcurrent detection device 930, and stores the first, second, and third current values ​​in the corresponding buffers. In some examples, the first, second, and third current values ​​are all instantaneous current values.

[0200] Step S420: Calculate the first current difference between the first current value and the second current value; calculate the second current difference between the first current value and the third current value.

[0201] Specifically, the first current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 910 and the second overcurrent detection device 920, and the second current difference is the absolute value of the instantaneous current difference between the first overcurrent detection device 910 and the third overcurrent detection device 930.

[0202] In step S430, when the first current difference is greater than the first difference threshold and the second current difference is greater than the second difference threshold, a first warning signal is output, indicating that the first overcurrent detection device 910 is abnormal.

[0203] Specifically, the first difference threshold is the current difference threshold between the first overcurrent detection device 910 and the second overcurrent detection device 920, and the second difference threshold is the current difference threshold between the first overcurrent detection device 910 and the third overcurrent detection device 930. By comparing the first current difference between the first overcurrent detection device 910 and the second overcurrent detection device 920 with the corresponding first difference threshold, and by comparing the second current difference between the first overcurrent detection device 910 and the third overcurrent detection device 930 with the corresponding second difference threshold, abnormal overcurrent detection devices can be detected based on the comparison results.

[0204] When the first current difference is greater than the first difference threshold and the second current difference is greater than the second difference threshold, the first overcurrent detection device 910 is determined to be abnormal, outputs the first warning signal, and sends it to the monitoring backend to realize real-time warning.

[0205] The aforementioned abnormal early warning method uses the first three-out-of-two protection device 970 as the main equipment. It receives the current values ​​from three overcurrent detection devices. Using the first current value as a reference, it obtains the first current difference and the second current difference between the first current value and the other two sampled values. The first current difference and the second current difference are compared with the corresponding difference threshold values. When both current differences exceed the corresponding difference threshold values, an abnormal early warning is issued for the first overcurrent detection device corresponding to the first current value. Similarly, the horizontal early warning is achieved by comparing the sampled data between the overcurrent detection devices, which enhances the ability to monitor the bridge arm current from multiple angles, enhances the panoramic fault monitoring and early warning capability of the energy storage valve control system, reduces the dead zone of the early warning, and thus safeguards the reliable operation of the valve control system from all aspects and multiple angles.

[0206] In some embodiments, the method further includes: calculating a third current difference between the second current value and the third current value; outputting a second warning signal when the first current difference is greater than a first difference threshold, the second current difference is less than or equal to the second difference threshold, and the third current difference is greater than the third difference threshold, the second warning signal indicating that the second overcurrent detection device 920 is abnormal; and outputting a third warning signal when the first current difference is less than or equal to the first difference threshold, the second current difference is greater than the second difference threshold, and the third current difference is greater than the third difference threshold, the third warning signal indicating that the third overcurrent detection device 930 is abnormal.

[0207] In some embodiments, the method further includes: storing a plurality of first current values, a plurality of second current values, and a plurality of third current values ​​associated with a sampling sequence number within a predetermined time period including a plurality of time sections; and calculating a first difference threshold value, a second difference threshold value, and a third difference threshold value based on the stored plurality of first current values, a plurality of second current values, and a plurality of third current values ​​when each of the stored plurality of first current values, a plurality of second current values, and a plurality of third current values ​​is within a preset current range.

[0208] In some embodiments, calculating the first difference threshold, the second difference threshold, and the third difference threshold includes: calculating, according to the corresponding sampling sequence number, the first current difference between the stored first current value and the second current value, the second current difference between the first current value and the third current value, and the third current difference between the second current value and the third current value at each time segment within a predetermined time period; and processing the first current difference, the second current difference, and the third current difference at each time segment to obtain the first difference threshold, the second difference threshold, and the third difference threshold.

[0209] In some embodiments, the first current difference, the second current difference, and the third current difference at each time segment are processed to obtain a first difference threshold value, a second difference threshold value, and a third difference threshold value, including:

[0210] Calculate the average value of multiple first current differences under multiple time sections to obtain the typical value of the first difference;

[0211] Calculate the product of the typical value of the first difference and the preset threshold coefficient to obtain the threshold value of the first difference;

[0212] Calculate the average value of multiple second current differences under multiple time sections to obtain the typical value of the second difference;

[0213] Calculate the product of the typical value of the second difference and the preset threshold coefficient to obtain the threshold value of the second difference;

[0214] Calculate the average of multiple third current differences across multiple time sections to obtain typical values ​​of the third current difference; and

[0215] The third difference threshold value is obtained by multiplying the typical value of the third difference by the preset threshold coefficient.

[0216] The above-mentioned anomaly warning methods are all applicable to valve control systems in the engineering integration of AC / DC microgrid / distribution network technology and battery energy storage technology. In addition to being applicable to anomaly warnings for multiple overcurrent detection devices in valve control systems, they can also be applied to anomaly warnings for multiple devices of the same level in other power scenarios.

[0217] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0218] In some embodiments, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0219] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by dedicated circuitry or by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited thereto.

[0220] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0221] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An overcurrent detection device, characterized in that, It operates in parallel with N-1 other overcurrent detection devices in the N-M redundancy structure of the energy storage valve control system, where N is an integer greater than or equal to 3, and M is an integer less than N. The overcurrent detection device is communicatively connected to each of the N-1 other overcurrent detection devices. The overcurrent detection device includes: A sampling unit is configured to sample the first measurement unit to obtain a first current value; The transceiver unit is configured to receive, from the N-1 additional overcurrent detection devices, the second to the Nth current values ​​sampled by each overcurrent detection device for the corresponding measurement unit; The difference calculation unit is configured to calculate a first current difference to a (N-1)th current difference, wherein the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value, respectively; and The warning output unit is configured to output a first warning signal when the first current difference to the (N-1)th current difference is greater than the first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, respectively. The first warning signal indicates that the overcurrent detection device is abnormal. The overcurrent detection device further includes: A storage unit configured to store multiple first current values ​​to Nth current values ​​in association with sampling sequence numbers within a predetermined time period including multiple time segments; The difference calculation unit is configured to: calculate the average value of each of the multiple first current differences to multiple (N-1)th current differences under the multiple time sections, to obtain typical values ​​of the first difference to the (N-1)th difference; and calculate the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value under the multiple time sections, to obtain typical values ​​of the differences between the Kth current value and the remaining current values ​​from the second current value to the Nth current value. The difference threshold calculation unit is configured as follows: when each of the stored multiple first current values ​​to Nth current values ​​is within a preset current range, the product of the first difference typical value to the (N-1)th difference typical value and the preset threshold coefficient is calculated respectively to obtain the first difference threshold value to the (N-1)th difference threshold value; and the product of the difference typical value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient is calculated respectively to obtain the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

2. The overcurrent detection device according to claim 1, characterized in that, The difference calculation unit is further configured to calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; and The early warning output unit is also configured to: When the (K-1)th current difference among the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, and the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and each of the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold, a second warning signal is output. The second warning signal indicates that the overcurrent detection device that sampled the Kth current value is malfunctioning.

3. The overcurrent detection device according to claim 2, characterized in that, The difference threshold calculation unit is configured to calculate the first difference threshold value to the (N-1)th difference threshold value based on the stored plurality of first current values ​​to Nth current values ​​when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range, and to calculate each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

4. The overcurrent detection device according to claim 3, characterized in that, The difference calculation unit is configured to: calculate the first current difference to the (N-1)th current difference between the stored first current value and the stored second current value to the Nth current value at each time section within the predetermined time period, according to the corresponding sampling sequence number; and calculate the current difference between the Kth current value among the stored second current value to the Nth current value and the remaining current values ​​among the second current value to the Nth current value. as well as The difference threshold calculation unit is configured to calculate the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value under each time segment. And based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value at each time segment, calculate the threshold values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value.

5. An anomaly early warning method, characterized in that, The method is applied to an N-to-M redundancy structure in an energy storage valve control system, where N is an integer greater than or equal to 3, and M is an integer less than N. The N-to-M redundancy structure includes a first to an Nth overcurrent detection device operating in parallel, and a protection device. The first to the Nth overcurrent detection devices are adapted to sample the first to the Nth measurement units to obtain a first to the Nth current value. The protection device is adapted to perform N-to-M voting on the overcurrent detection results output by the first to the Nth overcurrent detection devices and output the N-to-M voting result. Each of the first to the Nth overcurrent detection devices is communicatively connected to N-1 other overcurrent detection devices. The method is executed by any of the first to the Nth overcurrent detection devices. When the method is executed by the first overcurrent detection device, the method includes: The second to the Nth current values ​​are received from the second overcurrent detection device to the Nth overcurrent detection device, respectively. Calculate the first current difference to the (N-1)th current difference, where the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value, respectively; and When the first current difference to the (N-1)th current difference is greater than the first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device is abnormal. The method further includes: Within a predetermined time period that includes multiple time segments, multiple first current values ​​to Nth current values ​​are stored in association with sampling sequence numbers; Calculate the average of each of the first current difference to the (N-1)th current difference under multiple time sections to obtain the typical values ​​of the first difference to the (N-1)th difference. When each of the stored multiple first current values ​​to Nth current values ​​is within a preset current range, the product of the first difference typical value to the (N-1)th difference typical value and the preset threshold coefficient is calculated respectively to obtain the first difference threshold value to the (N-1)th difference threshold value. Calculate the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value at each of the multiple time sections, to obtain typical values ​​of each difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value; and When each of the stored multiple first to Nth current values ​​is within a preset current range, the typical value of each difference between the Kth current value and the remaining current values ​​from the second to Nth current values ​​is calculated and multiplied by the preset threshold coefficient to obtain the threshold value of each difference between the Kth current value and the remaining current values ​​from the second to Nth current values.

6. The method according to claim 5, characterized in that, Also includes: Calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; as well as When the (K-1)th current difference among the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, and the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and each of the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold, a second warning signal is output, indicating that the Kth overcurrent detection device is malfunctioning.

7. The method according to claim 6, characterized in that, Also includes: When each of the stored multiple first current values ​​to Nth current values ​​is within a preset current range, based on the stored multiple first current values ​​to Nth current values, calculate the first difference threshold value to the (N-1)th difference threshold value, and calculate each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

8. The method according to claim 7, characterized in that, The calculation of the first difference threshold value to the (N-1)th difference threshold value, and the calculation of each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value, include: At each time segment within the predetermined time period, the stored first current value and the first to N-1 current differences between the stored second current value and the Nth current value are calculated according to the corresponding sampling sequence number. Furthermore, the current differences between the Kth current value among the stored second to Nth current values ​​and the remaining current values ​​among the second to Nth current values ​​are calculated. Based on the first current difference to the (N-1)th current difference in each time segment, calculate the first difference threshold value to the (N-1)th difference threshold value; and based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value in each time segment, calculate the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

9. A protective device, characterized in that, It is located in the N-to-M redundancy structure of the energy storage valve control system, where N is an integer greater than or equal to 3, and M is an integer less than N. The protection device is adapted to perform N-to-M voting on the overcurrent detection results output by the first to the Nth overcurrent detection devices operating in parallel and output the N-to-M voting result. The protection device includes: A receiving unit is configured to receive first current values ​​to Nth current values ​​from the first overcurrent detection device to the Nth overcurrent detection device, respectively. A difference calculation unit is configured to calculate a first current difference to a (N-1)th current difference, wherein the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value, respectively; and The warning output unit is configured to output a first warning signal when the first current difference to the (N-1)th current difference is greater than the first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, respectively. The first warning signal indicates that the first overcurrent detection device is abnormal. The protective device further includes: A storage unit configured to store multiple first current values ​​to Nth current values ​​in association with sampling sequence numbers within a predetermined time period including multiple time segments; The difference calculation unit is configured to: calculate the average value of each of the multiple first current differences to multiple (N-1)th current differences under the multiple time sections, to obtain typical values ​​of the first difference to the (N-1)th difference; calculate the average value of each current difference corresponding one-to-one with the Kth current value and the remaining current values ​​from the second current value to the Nth current value under the multiple time sections, to obtain typical values ​​of the differences between the Kth current value and the remaining current values ​​from the second current value to the Nth current value; and The difference threshold calculation unit is configured as follows: when each of the stored multiple first current values ​​to Nth current values ​​is within a preset current range, the product of the first difference typical value to the (N-1)th difference typical value and the preset threshold coefficient is calculated respectively to obtain the first difference threshold value to the (N-1)th difference threshold value; and the product of the difference typical value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value and the preset threshold coefficient is calculated respectively to obtain the difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

10. The protection device according to claim 9, characterized in that, The difference calculation unit is configured to calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; and The early warning output unit is configured as follows: When the (K-1)th current difference among the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, and the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and each of the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold, a second warning signal is output, indicating that the Kth overcurrent detection device is malfunctioning.

11. The protection device according to claim 10, characterized in that, The difference threshold calculation unit is configured to calculate the first difference threshold value to the (N-1)th difference threshold value based on the stored plurality of first current values ​​to Nth current values ​​when each of the stored plurality of first current values ​​to Nth current values ​​is within a preset current range, and to calculate each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

12. The protection device according to claim 11, characterized in that, The difference calculation unit is configured to: calculate the first current difference to the (N-1)th current difference between the stored first current value and the stored second current value to the Nth current value at each time section within the predetermined time period, according to the corresponding sampling sequence number; and calculate the current difference between the Kth current value among the stored second current value to the Nth current value and the remaining current values ​​among the second current value to the Nth current value. as well as The difference threshold calculation unit is configured to calculate the first difference threshold value to the (N-1)th difference threshold value based on the first current difference value to the (N-1)th current difference value under each time segment. And based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value at each time segment, calculate the threshold values ​​of the difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value.

13. An anomaly early warning method, characterized in that, The method is applied to an N-to-M redundancy structure in an energy storage valve control system, where N is an integer greater than or equal to 3, and M is an integer less than N. The N-to-M redundancy structure includes a first to an Nth overcurrent detection device operating in parallel, and a protection device. The first to the Nth overcurrent detection devices are adapted to sample the first to the Nth measurement units to obtain a first to the Nth current value. The protection device is adapted to perform N-to-M voting on the overcurrent detection results output by the first to the Nth overcurrent detection devices and output the N-to-M voting result. The method is executed by the protection device and includes: The first current value to the Nth current value are received from the first overcurrent detection device to the Nth overcurrent detection device, respectively. Calculate the first current difference to the (N-1)th current difference, where the first current difference to the (N-1)th current difference represents the current difference between the first current value and the second current value to the Nth current value, respectively; and When the first current difference to the (N-1)th current difference is greater than the first difference threshold value to the (N-1)th difference threshold value corresponding to the first current difference to the (N-1)th current difference, a first warning signal is output, and the first warning signal indicates that the first overcurrent detection device is abnormal; The method further includes: Within a predetermined time period that includes multiple time segments, multiple first current values ​​to Nth current values ​​are stored in association with sampling sequence numbers; Calculate the average value of each of the multiple first current differences to multiple (N-1)th current differences under the multiple time sections to obtain the typical values ​​of the first difference to the (N-1)th difference; When each of the stored multiple first current values ​​to Nth current values ​​is within a preset current range, the product of the first difference typical value to the (N-1)th difference typical value and the preset threshold coefficient is calculated respectively to obtain the first difference threshold value to the (N-1)th difference threshold value. Calculate the average value of each current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value at each of the multiple time sections, to obtain typical values ​​of each difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value; and When each of the stored multiple first to Nth current values ​​is within a preset current range, the typical value of each difference between the Kth current value and the remaining current values ​​from the second to Nth current values ​​is calculated and multiplied by the preset threshold coefficient to obtain the threshold value of each difference between the Kth current value and the remaining current values ​​from the second to Nth current values.

14. The method according to claim 13, characterized in that, Also includes: Calculate the current difference between the Kth current value from the second current value to the Nth current value and the remaining current values ​​from the second current value to the Nth current value; as well as When the (K-1)th current difference among the first current difference to the (N-1)th current difference is greater than the (K-1)th difference threshold, and the remaining N-2 current differences are less than or equal to the corresponding difference threshold, and the current difference between the Kth current value and each of the remaining current values ​​from the second current value to the Nth current value is greater than the corresponding difference threshold, a second warning signal is output, indicating that the Kth overcurrent detection device is malfunctioning.

15. The method according to claim 14, characterized in that, Also includes: When each of the stored multiple first current values ​​to Nth current values ​​is within a preset current range, based on the stored multiple first current values ​​to Nth current values, calculate the first difference threshold value to the (N-1)th difference threshold value, and calculate each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

16. The method according to claim 15, characterized in that, The calculation of the first difference threshold value to the (N-1)th difference threshold value, and the calculation of each difference threshold value of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value, include: At each time segment within the predetermined time period, the stored first current value and the first to N-1 current differences between the stored second current value and the Nth current value are calculated according to the corresponding sampling sequence number. Furthermore, the current differences between the Kth current value among the stored second to Nth current values ​​and the remaining current values ​​among the second to Nth current values ​​are calculated. Based on the first current difference to the (N-1)th current difference in each time segment, calculate the first difference threshold value to the (N-1)th difference threshold value; and based on the current difference between the Kth current value and the remaining current values ​​from the second current value to the Nth current value in each time segment, calculate the difference threshold values ​​of the Kth current value relative to the remaining current values ​​from the second current value to the Nth current value.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 5 to 8, 13 to 16.

Images