AC relay adhesion detection method and device for energy storage converter

Abstract

The present application relates to a method and device for detecting adhesion of AC relays of an energy storage converter, which first closes each AC side relay and DC side relay to energize the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that is stuck is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. Based on the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that is stuck is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, making it easier to control the overall cost, volume and design difficulty of the energy storage converter.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage converters, and in particular to a method and device for detecting adhesion of an AC relay of an energy storage converter. Background Art

[0002] With the rapid construction of energy storage power stations in recent years, the safety of energy storage converters has attracted much attention. The role of AC relays is to reliably disconnect the energy storage converter and the power grid in critical scenarios to protect the safety of the energy storage system and related personnel. However, due to improper use of relays and extreme operating conditions of energy storage converters, there is a risk of relay adhesion, which makes it unable to perform the disconnection function, endangering the safety of the energy storage system and related personnel.

[0003] Currently, mainstream detection methods rely on adding a dedicated relay sticking detection circuit inside the device. This circuit determines relay sticking by measuring the voltage difference across the terminals. As the number of relays increases, the more signals need to be collected, the more detection circuits are needed. These methods not only increase the cost and size of the energy storage inverter but also complicate the design of the device. For example, the technical solution disclosed in patent publication number CN117723954A, entitled "Relay Failure Detection Method for Grid-Connected Inverter and Grid-Connected Inverter," detects relay sticking by measuring the current flowing through the Y capacitor connected between the housing and the ground. This current is typically very small, and in high-power scenarios, the current sensor requires high detection accuracy, is incompatible with all power ranges, and requires a large number of signals to be collected. For example, the technical solution disclosed in patent publication number CN118033405A, entitled "A Relay Detection Circuit and Control Method for Energy Storage Inverter," relies on adding detection points between two groups of relays. This requires collecting multiple signals for processing, increasing costs and complexity. For example, the technical solution disclosed in the patent publication number CN221056603U and the application name "A detection device for inverter output relays" requires the use of relays with auxiliary contacts, which is relatively expensive. When there are a large number of relays in the energy storage inverter, the controller needs to reserve multiple interfaces, which occupy more control resources.

[0004] It can be seen from this that the current mainstream AC relay adhesion detection methods used in energy storage converters require additional hardware design when effectively dealing with the situation where the number of relays increases, resulting in higher overall cost, volume and design difficulty. Summary of the Invention

[0005] Based on this, the current mainstream AC relay adhesion detection method used in energy storage converters requires additional hardware design to effectively deal with the increase in the number of relays, resulting in the overall cost, volume and design difficulty being high. The embodiment of the present disclosure provides an AC relay adhesion detection method and device for an energy storage converter.

[0006] The present disclosure provides a method for detecting adhesion of an AC relay of an energy storage converter, comprising the steps of:

[0007] Pulling in each AC side relay and DC side relay to energize the internal bus capacitor; wherein there are two or more AC side relays;

[0008] Disconnecting the DC side relay and selectively disconnecting one or more of the AC side relays to cause the internal bus capacitor voltage to drop;

[0009] The AC side relay that is stuck is determined based on the internal bus voltage and the selective disconnection; wherein the internal bus voltage is the voltage value after the internal bus capacitor voltage drops.

[0010] The AC relay adhesion detection method of the energy storage converter in the embodiment of the present disclosure first attracts each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that has adhered is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. Based on the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that has adhered is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, making it convenient to control the overall cost, volume and design difficulty of the energy storage converter.

[0011] As one of the optional embodiments, the process of attracting each AC side relay and DC side relay to power on the internal bus capacitor includes the steps of:

[0012] energizing the pre-charging relay to pre-charge the internal bus capacitor;

[0013] After the pre-charging is completed, the main relay is pulled in to complete the power-on of the internal bus capacitor; wherein, the DC side relay includes the pre-charging relay and the main relay. As one of the optional embodiments,

[0014] As one of the optional embodiments, the process of determining the AC-side relay that is stuck based on the internal bus voltage and the selective disconnection includes the steps of:

[0015] According to the voltage value of the internal bus voltage, the number of AC side relays that are stuck is determined;

[0016] The AC side relay where adhesion occurs is determined according to the number and the selective disconnection.

[0017] As one of the optional embodiments, the voltage value of the internal bus voltage corresponds one-to-one to the number of the AC-side relays that are stuck.

[0018] As one of the optional embodiments, when the voltage value of the internal bus voltage is α times the peak value of the grid phase voltage, it indicates that all the AC side relays are stuck;

[0019] When the voltage value of the internal bus voltage is β times the peak value of the grid phase voltage, it indicates that the two AC side relays are stuck;

[0020] When the voltage value of the internal bus voltage is lower than β times the peak value of the grid phase voltage, it indicates that one AC side relay is stuck or no AC side relay is stuck;

[0021] Among them, α is greater than β, α is 1.9-2.1; β is 1.6-1.8.

[0022] As an optional embodiment, the α is 2, and the β is 1.732.

[0023] As one of the optional embodiments, the process of determining the AC-side relay that is stuck based on the internal bus voltage and the selective disconnection includes the steps of:

[0024] According to the one or more selective disconnections and the corresponding internal bus voltages, the AC side relay where adhesion occurs is determined.

[0025] The present disclosure also provides an AC relay adhesion detection device for an energy storage converter, comprising:

[0026] A power-on processing module, used to attract each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays;

[0027] A power-off processing module, configured to disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the internal bus capacitor voltage to drop;

[0028] A detection and determination module is used to determine the AC side relay that is stuck based on the internal bus voltage and the selective disconnection; wherein the internal bus voltage is the voltage value after the internal bus capacitor voltage drops.

[0029] The AC relay adhesion detection device of the energy storage converter of the disclosed embodiment first attracts each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that has adhered is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. Based on the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that has adhered is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, making it easier to control the overall cost, volume and design difficulty of the energy storage converter.

[0030] At least one embodiment of the present disclosure further provides a data control device, including:

[0031] one or more memories non-transitorily storing computer-executable instructions;

[0032] One or more processors are configured to run computer-executable instructions, wherein the computer-executable instructions, when run by the one or more processors, implement the AC relay adhesion detection method for the energy storage converter according to any embodiment of the present disclosure.

[0033] The above-mentioned data control device first attracts each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that is stuck is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. According to the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that is stuck is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, which facilitates the control of the overall cost, volume and design difficulty of the energy storage converter.

[0034] At least one embodiment of the present disclosure further provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, implement the AC relay adhesion detection method for the energy storage converter according to any embodiment of the present disclosure.

[0035] The above-mentioned non-transient computer-readable storage medium first attracts each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that is stuck is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. According to the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that is stuck is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, which facilitates the control of the overall cost, volume and design difficulty of the energy storage converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flowchart of a method for detecting adhesion of an AC relay of an energy storage converter according to a disclosed embodiment;

[0037] Figure 2 This is the system diagram of the INPC three-level three-phase energy storage converter;

[0038] Figure 3 Flowchart of a method for detecting adhesion of an AC relay of an energy storage converter according to a preferred embodiment;

[0039] Figure 4 A flow chart of a method for detecting adhesion of an AC relay of an energy storage converter in a specific application embodiment;

[0040] Figure 5 This is a module structure diagram of an AC relay adhesion detection device for an energy storage converter according to a disclosed embodiment;

[0041] Figure 6 A schematic block diagram of a data control device provided for at least one embodiment of the present disclosure;

[0042] Figure 7 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0044] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0045] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of some known functions and components.

[0046] An embodiment of the present disclosure provides a method for detecting adhesion of an AC relay of an energy storage converter.

[0047] Figure 1 FIG. 1 is a flow chart of a method for detecting adhesion of an AC relay of an energy storage converter according to a disclosed embodiment. Figure 1 As shown, a method for detecting adhesion of an AC relay of an energy storage converter according to a disclosed embodiment includes steps S100 to S102:

[0048] S100, closing each AC side relay and DC side relay to energize the internal bus capacitor; wherein there are two or more AC side relays;

[0049] S101, disconnecting the DC side relay and selectively disconnecting one or more AC side relays to cause the internal bus capacitor voltage to drop;

[0050] S102, determining the AC side relay that is stuck based on the internal bus voltage and the selective disconnection; wherein the internal bus voltage is the voltage value after the internal bus capacitor voltage drops.

[0051] The following explains the relay distribution of the energy storage converter to facilitate understanding of the embodiments of the present disclosure. The source of the energy storage converter is a battery, and the battery and the DC side of the NPC (Neutral Point Clamped) are separated by a DC side relay. The DC side relay includes a pre-charge relay and a main relay. The AC side of the energy storage converter is generally connected to the grid through an AC side relay. The AC side relays are configured in groups, and each AC side relay controls one phase separately. The DC side is provided with an internal bus capacitor. For example, Figure 2This is the INPC three-level three-phase energy storage converter system diagram, as shown in Figure 2 As shown, the battery and the DC side of the INPC (Type I NPC) are separated by relays. The DC side of the INPC has large-capacity internal bus capacitors (Cdc1 and Cdc2). During startup, the relay P-Relay needs to be pre-charged to pre-charge the internal bus capacitors before the main relay M-Relay can be closed. There are generally two groups of relays between the bridge arm and the power grid: one group is the bridge arm side relay (R1, S1, T1), and the other group is the grid side relay (R2, S2, T2). When the bridge arm side relay is first tested, the grid side relay needs to be energized, the bridge arm side relay remains disconnected, and all DC side relays are disconnected. Both the grid side relay and the bridge arm side relay are AC side relays. In the embodiment of the present disclosure, the AC side relay is only for either the grid side relay or the bridge arm side relay group, and the other group is fully energized by default. Based on the ideas of the embodiment of the present disclosure, it is applicable to both the grid side relay and the bridge arm side relay, and is also applicable to scenarios with more groups of relays on the AC side.

[0052] Therefore, the AC side relays of other groups are always in the energized state by default. The AC side relays in step S100 are the special group selected for detection. The AC side relays and DC side relays are energized by the battery to support the internal bus capacitor.

[0053] After the internal bus capacitors are powered on, the DC-side relays and, optionally, the AC-side relays are disconnected. If the AC-side relays are not stuck, the remaining charge in the internal bus capacitors will be consumed by the DC-side resistors, causing the internal bus voltage to continuously drop to zero. If the AC-side relays are stuck, a rectification effect will occur on the energy storage converter, limiting the internal bus voltage to a specific value, depending on the number of stuck AC-side relays. Furthermore, the rectification effect will vary depending on the number of stuck AC-side relays, resulting in different corresponding internal bus voltages. By monitoring the internal bus voltage, the number of stuck AC-side relays can be determined. Furthermore, by selectively disconnecting the AC-side relays while keeping some AC-side relays engaged, the stuck AC-side relays can be identified based on multiple power-on and power-off tests.

[0054] As a preferred embodiment, Figure 3 FIG. 1 is a flow chart of a method for detecting adhesion of an AC relay of an energy storage converter according to a preferred embodiment. Figure 3 As shown, the process of attracting each AC side relay and DC side relay in step S100 to power on the internal bus capacitor includes steps S200 and S201:

[0055] S200, energizing the pre-charging relay to pre-charge the internal bus capacitor;

[0056] S201, after the pre-charging is completed, the main relay is attracted to complete the power-on of the internal bus capacitor; wherein, the DC side relay includes the pre-charging relay and the main relay.

[0057] As a preferred embodiment, Figure 3 As shown, the process of determining the AC side relay that is stuck according to the internal bus voltage and the selective disconnection in step S102 includes steps S202 and S203:

[0058] S203, determining the number of AC-side relays that are stuck based on the voltage value of the internal bus voltage;

[0059] S204: Determine the AC-side relays where adhesion occurs based on the number and the selective disconnection.

[0060] According to the following description and steps, it can be seen that the voltage value of the internal bus voltage corresponds one-to-one to the number of AC-side relays that are stuck.

[0061] Typically, the energy storage converter is generally connected to a three-phase grid, with a three-phase grid as a preferred embodiment. When the voltage value of the internal bus voltage is α times the peak value of the grid phase voltage, it indicates that all the AC side relays are stuck; when the voltage value of the internal bus voltage is β times the peak value of the grid phase voltage, it indicates that two AC side relays are stuck; when the voltage value of the internal bus voltage is lower than β times the peak value of the grid phase voltage, it indicates that one AC side relay is stuck or no AC side relay is stuck; wherein, α is greater than β, α is 1.9-2.1; β is 1.6-1.8.

[0062] Preferably, α is 2, and β is 1.732.

[0063] As a preferred embodiment, Figure 3 As shown, the process of determining the AC side relay that is stuck according to the internal bus voltage and the selective disconnection in step S101 includes step S202:

[0064] S202: Determine an AC-side relay that is stuck based on one or more selective disconnections and the corresponding internal bus voltage.

[0065] The following Figure 2 Taking the three-phase INPC three-level three-phase energy storage converter shown as an example, a preferred embodiment is explained for the adhesion detection of the grid-side relay. Figure 4 Flowchart of a method for detecting adhesion of an AC relay of an energy storage converter in a specific application embodiment. Figure 4 Follow steps 1 to 6 as shown.

[0066] Step 1:

[0067] The energy storage converter's source is a battery. The battery and the INPC's DC side are separated by a relay. The INPC's DC side has large-capacity bus capacitors (Cdc1 and Cdc2). Therefore, during startup, the pre-charge relay P-Relay must be pre-charged before the main relay M-Relay can be closed.

[0068] There are generally two groups of relays between the bridge arm and the grid, one group is the bridge arm side relay (R1, S1, T1), and the other group is the grid side relay (R2, S2, T2). When testing the bridge arm side relay first, it is necessary to attract the grid side relay, keep the bridge arm side relay open, and disconnect all relays on the DC side.

[0069] Step 2:

[0070] The disconnection of the DC-side relay deprives the inner bus of battery support. The remaining charge Uc1 on the inner bus capacitor will be consumed and dropped by R2 and R3. R2 and R3 are used by the energy storage converter to discharge the inner bus capacitor after shutdown. Their resistance is generally 10,000 ohms or above. Because the grid-side relay is in the energized state, if there is two or three-phase adhesion in the bridge arm-side relay, when the inner bus voltage drops to the uncontrolled rectification value of the line voltage (1.732 times Ug) or the three-phase full-bridge rectification voltage (2 times Ug), the grid will perform uncontrolled rectification on the inner bus. At this time, because the PCS (energy storage converter) is not running and the auxiliary power supply is generally drawn from the battery or the grid, the power of R2 and R3 is also relatively small, so the inner bus voltage will be clamped at 1.732Ug or 2Ug.

[0071] If the internal bus voltage drops to 2 times Ug and then stops dropping, it means that the three-phase relays on the bridge arm side are simultaneously stuck, resulting in three-phase uncontrolled rectification. At this time, the three-phase relays on the bridge arm side are simultaneously stuck, the detection stops, and the converter reports a fault and shuts down.

[0072] If the internal bus voltage drops to 1.732 times Ug and then stops dropping, it means that the relays on the two-phase bridge arm side are stuck, resulting in uncontrolled rectification of the line voltage. In order to detect the position of the faulty relay, record the simultaneous sticking fault of the two-phase relays and proceed to the next detection step.

[0073] If Uc1 drops below 1.732 times Ug and continues to drop toward zero voltage, a voltage threshold Uth lower than 1.732Ug can be set here. When Uc1 drops to Uth, it indicates that the bridge arm side relay does not have two-phase relays that are simultaneously stuck and cannot be clamped. After recording that there is no simultaneous sticking of multi-phase relays, proceed to the next detection step.

[0074] Steps 3-4:

[0075] If a two-phase relay adhesion fault is recorded in step 2, close the bridge arm side R1 relay in step 3. If Uc2 is clamped to 2Ug, it means that the closing of R1 causes the two-phase uncontrolled rectification in step 2 to become three-phase uncontrolled rectification, indicating that the relays S1 and T1 are adhered. At this time, the fault relay is recorded and the detection stops, and the machine reports a fault and stops.

[0076] If a two-phase relay adhesion fault is recorded in step 2, close the bridge arm side R1 relay in step 3. If Uc2 is clamped to 1.732Ug, it means that after R1 is closed, it is still a two-phase uncontrolled rectifier. R1 is one of the faulty relays. If you want to detect the fault location information of the other faulty relay, you need to go to step 5.

[0077] If no multi-phase relays are stuck simultaneously in step 2, then single-phase relays on the bridge arm may be stuck, or no relays are stuck. If Uc2 is clamped to 1.732Ug after closing R1, a fault has occurred in S1 or T1. If Uc2 drops to Uth after closing R1, then R1 may be stuck, or no relays on the bridge arm may be stuck. In either case, proceed to step 5 for testing.

[0078] Steps 5-6:

[0079] After the third test, Uc3 is obtained. The location of the relay with the sticking fault can be determined based on Uc2 and Uc3 and the fault information comparison table 1 in step 2. If no relay sticking is detected, the PCS can continue to test the grid-side relay.

[0080] Where Ucx represents the internal bus voltage, and x in the process represents the internal bus voltage value after the xth voltage drop. Uth represents the voltage threshold at which the internal bus voltage Uc cannot be clamped after detecting that no uncontrolled rectification has occurred.

[0081] Table 1 Relay adhesion fault detection comparison table

[0082]

[0083] The disclosed embodiment is based on the premise of not adding a dedicated relay adhesion detection circuit. The only signal that needs to be collected is the bus voltage signal within the PCS, and there are no special requirements for the accuracy of the sampling circuit. Therefore, it has the advantages of improving machine power density, low detection cost and high accuracy, and simple processing, and is suitable for mass production applications of energy storage converters.

[0084] The AC relay adhesion detection method of the energy storage converter in the embodiment of the present disclosure first attracts each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that has adhered is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. Based on the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that has adhered is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, making it convenient to control the overall cost, volume and design difficulty of the energy storage converter.

[0085] The embodiments of the present disclosure also provide an AC relay adhesion detection device for an energy storage converter.

[0086] Figure 5 FIG. 1 is a module structure diagram of an AC relay adhesion detection device for an energy storage converter according to a disclosed embodiment. Figure 5 As shown, an AC relay adhesion detection device for an energy storage converter according to one embodiment includes:

[0087] The power-on processing module 100 is used to attract each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays;

[0088] A power-off processing module 101 is configured to disconnect the DC-side relay and selectively disconnect one or more AC-side relays to cause the internal bus capacitor voltage to drop;

[0089] The detection and determination module 102 is used to determine the AC side relay that is stuck based on the internal bus voltage and the selective disconnection; wherein the internal bus voltage is the voltage value after the internal bus capacitor voltage drops.

[0090] The AC relay adhesion detection device of the energy storage converter of the disclosed embodiment first attracts each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays. Disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the voltage of the internal bus capacitor to drop. The AC side relay that has adhered is determined based on the internal bus voltage and selective disconnection; wherein, the internal bus voltage is the voltage value after the internal bus capacitor voltage drops. Based on the different effects of the selective disconnection of the AC side relay on the internal bus voltage, the AC side relay that has adhered is identified. This does not require the addition of additional hardware, but also has higher detection accuracy, making it easier to control the overall cost, volume and design difficulty of the energy storage converter.

[0091] At least one embodiment of the present disclosure further provides a data control device. Figure 6 A schematic block diagram of a data control device provided by at least one embodiment of the present disclosure. Figure 6 As shown, the data control device 20 may include one or more memories 200 and one or more processors 201. The memories 200 are used to non-transiently store computer-executable instructions; the processor 201 is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor 201, the processor 201 may execute one or more steps of the AC relay adhesion detection method for the energy storage converter according to any embodiment of the present disclosure.

[0092] The specific implementation and related explanation of each step of the AC relay adhesion detection method for energy storage converter can be found in the relevant content of the embodiment of the AC relay adhesion detection method for energy storage converter, which will not be repeated here. Figure 6 The components of the data control device 20 shown are merely exemplary and non-limiting. The data control device 20 may further include other components according to actual application requirements.

[0093] In one embodiment, the processor 201 and the memory 200 can communicate with each other directly or indirectly. For example, the processor 201 and the memory 200 can communicate via a network connection. The network can include a wireless network, a wired network, and / or any combination of a wireless network and a wired network. The present disclosure does not limit the type and function of the network. For another example, the processor 201 and the memory 200 can also communicate via a bus connection. The bus can be a peripheral component interconnect standard (PCI) bus or an extended industrial standard architecture (EISA) bus, etc. For example, the processor 201 and the memory 200 can be set at a remote data server end (cloud) or a distributed energy system end (local end), or can be set at a client end (for example, a mobile device such as a mobile phone). For example, the processor 201 can be a device with data processing capabilities and / or instruction execution capabilities, such as a central processing unit (CPU), a tensor processing unit (TPU), or a graphics processing unit GPU, and can control other components in the data prediction device 20 to perform the desired functions. The central processing unit (CPU) can be an X86 or ARM architecture, etc.

[0094] In one embodiment, the memory 200 may include any combination of one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, erasable programmable read-only memory (EPROM), portable compact disk read-only memory (CD-ROM), USB memory, flash memory, etc. One or more computer-executable instructions may be stored on the computer-readable storage medium, and the processor 201 may execute the computer-executable instructions to implement various functions of the data prediction device 20. Various applications and various data, as well as various data used and / or generated by the applications, may also be stored in the memory 200.

[0095] It should be noted that the data control device 20 can achieve technical effects similar to the aforementioned AC relay adhesion detection method for the energy storage converter, and the repeated parts will not be repeated.

[0096] At least one embodiment of the present disclosure also provides a non-transitory computer-readable storage medium. Figure 7 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. Figure 7 As shown, one or more computer-executable instructions 301 may be non-transitory stored on a non-transitory computer-readable storage medium 30. For example, when the computer-executable instructions 301 are executed by a computer, the computer may execute one or more steps of the AC relay adhesion detection method for an energy storage converter according to any embodiment of the present disclosure.

[0097] In one embodiment, the non-transitory computer-readable storage medium 30 may be applied to the above-mentioned data control device 20 , for example, it may be the memory 200 in the data control device 20 .

[0098] In one embodiment, the description of the non-transitory computer-readable storage medium 30 may refer to the description of the memory 200 in the embodiment of the data control device 20 , and the repeated parts will be omitted.

[0099] It should be noted that the memory 200 stores different non-transient computer executable instructions, and the data control device 20 corresponds to a firmware upgrade device. When the computer executable instructions are executed by the processor 201, the processor 201 can execute one or more steps in the AC relay adhesion detection method of the energy storage converter according to any embodiment of the present disclosure.

[0100] Regarding this disclosure, the following points need to be explained:

[0101] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to the general design.

[0102] (2) For the sake of clarity, the thickness and size of layers or structures in the drawings used to describe the embodiments of the present invention are exaggerated. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element can be "directly on" or "under" the other element, or intervening elements may be present.

[0103] (3) Unless there is a conflict, the embodiments of the present disclosure and the features therein may be combined to form new embodiments. The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. The scope of protection of the present disclosure shall be based on the scope of protection of the claims.

[0104] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0105] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for detecting adhesion of an AC relay of an energy storage converter, characterized in that: Including steps: Pulling in each AC side relay and DC side relay to energize the internal bus capacitor; wherein there are two or more AC side relays; Disconnecting the DC side relay and selectively disconnecting one or more of the AC side relays to cause the internal bus capacitor voltage to drop; Determine the AC side relay that is stuck based on the internal bus voltage and the selective disconnection; wherein the internal bus voltage is the voltage value after the internal bus capacitor voltage drops; The voltage value of the internal bus voltage corresponds to the number of AC-side relays that are stuck; When the voltage value of the internal bus voltage is α times the peak value of the grid phase voltage, it means that all the AC side relays are stuck; When the voltage value of the internal bus voltage is β times the peak value of the grid phase voltage, it indicates that the two AC side relays are stuck; When the voltage value of the internal bus voltage is lower than β times the peak value of the grid phase voltage, it indicates that one AC side relay is stuck or no AC side relay is stuck; Among them, α is greater than β, α is 1.9-2.1; β is 1.6-1.

8.

2. The AC relay adhesion detection method for an energy storage converter according to claim 1, characterized in that: The process of attracting each AC side relay and DC side relay to power on the internal bus capacitor includes the following steps: energizing the pre-charging relay to pre-charge the internal bus capacitor; After the pre-charging is completed, the main relay is attracted to complete the power-on of the internal bus capacitor; wherein, the DC side relay includes the pre-charging relay and the main relay.

3. The AC relay adhesion detection method for an energy storage converter according to claim 1, characterized in that: The process of determining the AC side relay that is stuck based on the internal bus voltage and the selective disconnection includes the steps of: According to the voltage value of the internal bus voltage, the number of AC side relays that are stuck is determined; The AC side relay where adhesion occurs is determined according to the number and the selective disconnection.

4. The AC relay adhesion detection method for an energy storage converter according to claim 1, wherein: The α is 2, and the β is 1.

732.

5. The AC relay adhesion detection method for an energy storage converter according to claim 1, wherein: The process of determining the AC side relay that is stuck based on the internal bus voltage and the selective disconnection includes the steps of: According to the one or more selective disconnections and the corresponding internal bus voltages, the AC side relay where adhesion occurs is determined.

6. An AC relay adhesion detection device for an energy storage converter, characterized in that: include: A power-on processing module, used to attract each AC side relay and DC side relay to power on the internal bus capacitor; wherein, there are two or more AC side relays; A power-off processing module, configured to disconnect the DC side relay and selectively disconnect one or more of the AC side relays to cause the internal bus capacitor voltage to drop; A detection and determination module, configured to determine the AC-side relay that is stuck based on the internal bus voltage and the selective disconnection; wherein the internal bus voltage is the voltage value after the internal bus capacitor voltage drops; The voltage value of the internal bus voltage corresponds to the number of AC-side relays that are stuck; When the voltage value of the internal bus voltage is α times the peak value of the grid phase voltage, it means that all the AC side relays are stuck; When the voltage value of the internal bus voltage is β times the peak value of the grid phase voltage, it indicates that the two AC side relays are stuck; When the voltage value of the internal bus voltage is lower than β times the peak value of the grid phase voltage, it indicates that one AC side relay is stuck or no AC side relay is stuck; Among them, α is greater than β, α is 1.9-2.1; β is 1.6-1.

8.

7. A non-transitory computer-readable storage medium, characterized in that The non-transitory computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the AC relay adhesion detection method for the energy storage converter according to any one of claims 1 to 5 is implemented.

8. A data control device, characterized in that: include: one or more memories non-transitorily storing computer-executable instructions; One or more processors are configured to run computer-executable instructions, wherein the computer-executable instructions, when run by the one or more processors, implement the AC relay adhesion detection method for the energy storage converter according to any one of claims 1 to 5.

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