A method, system, device and medium for completing missing data of power electronic system

Abstract

The present invention discloses a method, system, device and medium for completing missing data of a power electronic system, which relates to the technical field of power electronic systems. The method includes: obtaining the operating data of multiple electronic devices of the same type in the power electronic system, and marking the operating data with a time stamp; removing abnormal data of data loss and data transmission error in the operating data, and using the operating data of the electronic device to be completed after removing the abnormal data as the missing data of the power electronic system; using the operating data of the adjacent electronic device corresponding to the time stamp of the missing data as the adjacent data, and using the operating data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data as the local data, inputting the adjacent data and the local data into a long short-term memory network, and obtaining the completed data of the power electronic system. The present invention can meet the real-time scheduling requirements of power stations for electronic devices.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic systems, and in particular to a method, system, device and medium for completing missing data of a power electronic system. Background Art

[0002] With the depletion of fossil energy and the urgency of environmental protection, the status of renewable energy power generation is becoming increasingly important. As the connection hub between renewable energy and the power grid, power electronics systems, especially distributed power electronics systems, are also attracting more and more attention. The digital and intelligent transformation of distributed power electronics systems is an effective means to improve the overall performance of the system. The primary basis of digital and intelligent transformation is the effective transmission and utilization of data, but data loss is inevitable during data transmission. Therefore, the completion of missing data in power electronics systems is a widely concerned issue.

[0003] In the prior art, the solution for completing missing data of electronic devices is mainly to complete the data based on mathematical methods. The specific process includes: reading the original electronic device data, analyzing the pattern of missing data, and using the chain equation multiple interpolation (MICE) method, which works by running a multivariate regression model. For each missing value, conditional modeling is performed based on the observed (non-missing) value, and the sparsity of the signal itself is used to restore the original signal from some observed samples. The original signal is processed to obtain a sparse sample representation to restore the original signal from a small number of observations based on sparsity.

[0004] The defect of the above-mentioned prior art is that all data of the missing data sequence must be confirmed, otherwise real-time completion cannot be achieved. Summary of the invention

[0005] Based on this, it is necessary to provide a method, system, device and medium for completing missing data in a power electronic system in response to the above technical problems.

[0006] An embodiment of the present invention provides a method for completing missing data of a power electronic system, comprising:

[0007] Acquire operation data of multiple electronic devices of the same type in the power electronic system, wherein the operation data is used to reflect the operation status of the electronic devices, and the operation data is marked with a time stamp;

[0008] Processing the operation data of the electronic equipment, removing abnormal data such as data loss and data transmission error in the operation data, and using the operation data of the electronic equipment to be completed after the abnormal data is removed as the missing data of the power electronic system;

[0009] The operation data of the adjacent electronic device at the time stamp corresponding to the missing data is used as the adjacent data, and the operation data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data is used as the local data, and the adjacent data and the local data are input into the long short-term memory network to obtain the completed data of the power electronic system;

[0010] Obtain the complete data of the power electronic system, which specifically includes:

[0011] Cut off k groups of continuous local data in any time period before the missing data appears and input them into the long short-term memory network to obtain an m×n time feature vector for retaining the implicit association between time series data;

[0012] Intercepting k groups of continuous local data in any time period before the missing data appears, combining the k groups of continuous adjacent data of p adjacent electronic devices in any time period before the missing data appears with the data at the time when the missing data appears, forming a (p+1)×(k+1) feature matrix, inputting the feature matrix into the long short-term memory network, and obtaining a q×m×n spatial feature vector representing the spatial features between the local data and the adjacent data;

[0013] The time feature vector and the space feature vector are fused to form a (q+1)×m×n fused feature vector; and the fused feature vector is re-input into the long short-term memory network to obtain the complete data of the power electronic system;

[0014] Wherein, p is the number of adjacent electronic devices, k is the number of groups of local data, and q, m, and n are all positive integers.

[0015] In addition, the operating data of multiple electronic devices of the same type in the power electronic system are obtained, which specifically includes:

[0016] Collecting raw data of multiple electronic devices of the same type in the power electronic system at a set sampling frequency, the raw data including input voltage, input current, output voltage and output current values ​​of the power electronic system;

[0017] According to the input voltage and input current, the input power of the electronic device is obtained;

[0018] The output power of the electronic device is obtained based on the output voltage and the output current;

[0019] The AC side voltage frequency, AC side voltage effective value and AC side voltage amplitude of the electronic device are calculated based on the phase-locked loop, and the operation data is obtained by combining the input power, output power, AC side voltage frequency, AC side voltage effective value and AC side voltage amplitude of the electronic device.

[0020] In addition, the operation data is marked with a time stamp, which specifically includes: using Beidou satellite or GPS satellite timing solutions to obtain an accurate clock, or obtaining an accurate clock through communication between wireless network nodes.

[0021] In addition, when the supplementary data of the power electronic system is obtained, if the local data or the adjacent data itself is missing, the supplementary data replaces the missing data to perform subsequent missing data supplementation operations.

[0022] In addition, when an electronic device continuously loses data and transmits data with errors for a number of times greater than a set threshold, the electronic device is deemed to have failed, and the power station manager or owner is notified to sound an alarm.

[0023] In addition, a power electronic system missing data completion system includes:

[0024] A data acquisition module, used to acquire operating data of multiple electronic devices of the same type in the power electronic system, wherein the operating data is used to reflect the operating status of the electronic devices, and the operating data is marked with a time stamp;

[0025] A data identification module is used to process the operation data of the electronic device, remove the abnormal data such as data loss and data transmission error in the operation data, and use the operation data of the electronic device to be completed after the abnormal data is removed as the missing data of the power electronic system;

[0026] A data completion module is used to use the operating data of the adjacent electronic device at the time stamp corresponding to the missing data as the adjacent data, and use the operating data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data as the local data, input the adjacent data and the local data into the long short-term memory network, and obtain the completed data of the power electronic system;

[0027] The abnormal alarm module is used to determine that an electronic device has a fault when the number of consecutive data loss and data transmission errors exceeds a set threshold, and notify the power station manager or owner to issue an alarm.

[0028] In addition, an electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps in the method for completing missing data of a power electronic system are implemented.

[0029] In addition, a computer-readable storage medium stores a program, which, when executed by a processor, implements the steps of a method for completing missing data of a power electronic system.

[0030] Compared with the prior art, the above-mentioned method, system, device and medium for completing missing data of a power electronic system provided by the embodiment of the present invention have the following beneficial effects:

[0031] In the prior art, the missing data of the electronic device is supplemented based on mathematical methods, and all the data of the missing data sequence must be known, otherwise the real-time supplement cannot be achieved.

[0032] The present invention uses the operating data of adjacent electronic devices at the time stamp corresponding to the missing data as adjacent data, and uses the operating data of the electronic device to be completed and the adjacent electronic devices in any time period before the time stamp corresponding to the missing data as local data, and inputs the adjacent data and the local data into a long short-term memory network to obtain the completed data of the power electronic system; in the process of completing the missing data of the power electronic system, there is no need to confirm all the data before and after the missing data sequence, and the missing data can be completed by knowing the operating data of the electronic device to be completed and the adjacent electronic devices, which can meet the real-time scheduling needs of the power station for electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A flowchart of a method for completing missing data of a power electronic system provided in one embodiment;

[0034] Figure 2 A data schematic diagram of a method for completing missing data of a power electronic system provided in an embodiment;

[0035] Figure 3 A schematic diagram of a completion model of a method for completing missing data of a power electronic system provided in an embodiment;

[0036] Figure 4 A structural block diagram of a power electronic system missing data completion system provided in one embodiment. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] An embodiment of the present invention introduces a method for completing missing data of a power electronic system. The distributed power electronic system includes but is not limited to photovoltaic power stations, wind farms, household distributed photovoltaics, rooftop photovoltaics, and other systems with multiple electronic devices in close geographical locations running simultaneously.

[0039] In this embodiment, Figure 1 As shown, specifically:

[0040] Step S01: acquiring operation data of a plurality of electronic devices of the same type in a power electronic system, wherein the operation data is used to reflect the operation status of the electronic devices, and the operation data is marked with a time stamp.

[0041] Step S02: Processing the operation data of the electronic device, removing abnormal data such as data loss and data transmission error in the operation data, and using the operation data of the electronic device to be completed after removing the abnormal data as the missing data of the power electronic system.

[0042] Step S03: Use the operating data of the adjacent electronic device at the time stamp corresponding to the missing data as the adjacent data, and use the operating data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data as the local data, input the adjacent data and the local data into the long short-term memory network to obtain the completed data of the power electronic system.

[0043] Step S04: For electronic devices that have been missing data for a long period of time, the power station manager or owner will be notified to perform maintenance on the electronic devices.

[0044] As one or more implementation modes, in step S01, (1) single-phase, three-phase single-stage, or multi-stage electronic devices are used to collect original data of multiple electronic devices of the same type in a power electronic system at a set sampling frequency, and the original data includes input voltage, input current, output voltage, and output current values ​​of the power electronic system.

[0045] (2) The input power of the electronic device is obtained based on the input voltage and the input current, that is, the input power is calculated by input voltage × input current.

[0046] (3) The output power of the electronic device is obtained based on the output voltage and the output current, that is, the output power is calculated by output voltage × output current.

[0047] (4) Calculate the AC side voltage frequency, AC side voltage effective value and AC side voltage amplitude of the electronic device based on the phase-locked loop.

[0048] (5) The operating data is obtained by combining the input power, output power, AC side voltage frequency, AC side voltage effective value and AC side voltage amplitude of the electronic equipment.

[0049] As one or more implementation modes, in step S01, the operation data is marked with a time stamp, specifically including obtaining an accurate clock using a Beidou / GPS satellite timing solution, or obtaining an accurate clock through communication between wireless network nodes.

[0050] As one or more implementation modes, in step S02, the acquired data is identified, including but not limited to: if the electronic device data is not received within the specified time, it is identified as abnormal data of data loss; the received data does not comply with the protocol verification rules or the transmission format is incorrect, it is identified as abnormal data of data transmission error.

[0051] As a necessary definition, in step S03, if Figure 2As shown, time series data, missing data, local data, adjacent data, and supplementary data are defined, including:

[0052] (1) Time series data: refers to a set of data that is arranged according to the data time stamp and all the data uploaded by an electronic device within a period of time.

[0053] (2) Missing data: refers to the operating data of the electronic equipment to be completed after removing abnormal data.

[0054] (3) Local data: refers to the operating data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data.

[0055] (4) Adjacent data: refers to the operating data of adjacent electronic devices that correspond to the missing data in the time stamp.

[0056] (5) Completion data: refers to obtaining the completion data of the power electronic system through the long short-term memory network.

[0057] As one or more implementation modes, in step S03, Figure 3 As shown in the figure, the input data of the long short-term memory network is local data and adjacent data, and the output data is the completed data. The long short-term memory network can also be replaced by artificial neural networks, gated recurrent unit networks, generative adversarial networks and other intelligent algorithms.

[0058] The long short-term memory network is used to obtain the complete data of the power electronic system, which includes:

[0059] (1) K groups of continuous local data in any time period before the missing data appear are intercepted and input into the long short-term memory network to obtain an m×n time feature vector for retaining the implicit association between time series data.

[0060] (2) K consecutive groups of local data in any time period before the missing data appear are intercepted, and the k consecutive groups of adjacent data of p adjacent electronic devices in any time period before the missing data appear are combined with the data at the time when the missing data appears to form a (p+1)×(k+1) feature matrix. The feature matrix is ​​input into the long short-term memory network to obtain a q×m×n spatial feature vector representing the spatial features between the local data and the adjacent data.

[0061] (3) The time feature vector and the spatial feature vector are fused to form a fused feature vector of (q+1)×m×n; and the fused feature vector is re-input into the long short-term memory network to obtain the completed data of the power electronic system.

[0062] Wherein, p is the number of adjacent electronic devices, k is the number of groups of local data, and q, m, and n are all positive integers.

[0063] As one or more implementation modes, in step S03, when the supplementary data of the power electronic system is obtained, if the local data or the adjacent data itself is missing, the supplementary data replaces the missing data to perform subsequent missing data supplementation operations.

[0064] As one or more implementation modes, in step S04, when a number of consecutive data loss and data transmission errors of an electronic device exceeds a set threshold, the electronic device is deemed to have failed, and the power station manager or owner is notified to raise an alarm.

[0065] The embodiment of the present invention also introduces a power electronic system missing data completion system, such as Figure 4 As shown, the system includes:

[0066] The data acquisition module is used to acquire the operating data of multiple electronic devices of the same type in the power electronic system, wherein the operating data is used to reflect the operating status of the electronic devices, and the operating data is marked with a time stamp.

[0067] The data identification module is used to process the operating data of the electronic equipment, remove the abnormal data such as data loss and data transmission error in the operating data, and use the operating data of the electronic equipment to be completed after the abnormal data is removed as the missing data of the power electronic system.

[0068] The data completion module is used to use the operating data of the adjacent electronic devices at the time stamp corresponding to the missing data as the adjacent data, and the operating data of the electronic device to be completed and the adjacent electronic devices in any time period before the time stamp corresponding to the missing data as the local data, and input the adjacent data and the local data into the long short-term memory network to obtain the completed data of the power electronic system.

[0069] The abnormal alarm module is used to determine that an electronic device has a fault when the number of consecutive data loss and data transmission errors exceeds a set threshold, and notify the power station manager or owner to issue an alarm.

[0070] An embodiment of the present invention further provides an electronic device.

[0071] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the method for completing missing data of a power electronic system as described in Embodiment 1 of the present invention are implemented. The detailed steps are the same as those of the method for completing missing data of a power electronic system provided in Embodiment 1, and will not be repeated here.

[0072] An embodiment of the present invention also provides a computer-readable storage medium.

[0073] A computer-readable storage medium stores a program, which, when executed by a processor, implements the steps of the method for completing missing data of a power electronic system as described in Embodiment 1 of the present invention. The detailed steps are the same as those of the method for completing missing data of a power electronic system provided in Embodiment 1, and will not be repeated here.

[0074] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for completing missing data in a power electronic system, characterized in that: include: Acquire operation data of multiple electronic devices of the same type in the power electronic system, wherein the operation data is used to reflect the operation status of the electronic devices, and the operation data is marked with a time stamp; Processing the operation data of the electronic equipment, removing abnormal data such as data loss and data transmission error in the operation data, and using the operation data of the electronic equipment to be completed after the abnormal data is removed as the missing data of the power electronic system; The operation data of the adjacent electronic device at the time stamp corresponding to the missing data is used as the adjacent data, and the operation data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data is used as the local data, and the adjacent data and the local data are input into the long short-term memory network to obtain the completed data of the power electronic system; When obtaining the supplementary data of the power electronic system, if the local data or the adjacent data itself is missing, the supplementary data replaces the missing data to perform subsequent missing data supplementation operations; The obtaining of the supplementary data of the power electronic system specifically includes: Cut off k groups of continuous local data in any time period before the missing data appears and input them into the long short-term memory network to obtain an m×n time feature vector for retaining the implicit association between time series data; Intercepting k groups of continuous local data in any time period before the missing data appears, combining the k groups of continuous adjacent data of p adjacent electronic devices in any time period before the missing data appears with the data at the time when the missing data appears, forming a (p+1)×(k+1) feature matrix, inputting the feature matrix into the long short-term memory network, and obtaining a q×m×n spatial feature vector representing the spatial features between the local data and the adjacent data; The time feature vector and the space feature vector are fused to form a (q+1)×m×n fused feature vector; and the fused feature vector is re-input into the long short-term memory network to obtain the complete data of the power electronic system; Wherein, p is the number of adjacent electronic devices, k is the number of groups of local data, and q, m, and n are all positive integers.

2. A method for completing missing data of a power electronic system according to claim 1, characterized in that: The obtaining of operating data of multiple electronic devices of the same type in the power electronic system specifically includes: Collecting original data of multiple electronic devices of the same type in the power electronic system at a set sampling frequency, wherein the original data includes an input voltage value, an input current value, an output voltage value, and an output current value of the power electronic system; According to the input voltage and input current, the input power of the electronic device is obtained; The output power of the electronic device is obtained based on the output voltage and the output current; The AC side voltage frequency, AC side voltage effective value and AC side voltage amplitude of the electronic device are calculated based on the phase-locked loop; and the operation data is obtained by combining the input power, output power, AC side voltage frequency, AC side voltage effective value and AC side voltage amplitude of the electronic device.

3. A method for completing missing data of a power electronic system according to claim 1, characterized in that: The use of time stamps to identify operating data specifically includes: obtaining an accurate clock using Beidou satellite or GPS satellite timing solutions, or obtaining an accurate clock through communication between wireless network nodes.

4. A method for completing missing data of a power electronic system according to claim 1, characterized in that: It also includes that when an electronic device continuously loses data and transmits data with errors for a number greater than a set threshold, the electronic device is deemed to have failed, and the power station manager or owner is notified to sound an alarm.

5. A completion system based on the missing data completion method of a power electronic system according to any one of claims 1 to 4, characterized in that: include: A data acquisition module, used to acquire operating data of multiple electronic devices of the same type in the power electronic system, wherein the operating data is used to reflect the operating status of the electronic devices, and the operating data is marked with a time stamp; A data identification module is used to process the operation data of the electronic device, remove the abnormal data such as data loss and data transmission error in the operation data, and use the operation data of the electronic device to be completed after the abnormal data is removed as the missing data of the power electronic system; A data completion module is used to use the operating data of the adjacent electronic device at the time stamp corresponding to the missing data as the adjacent data, and use the operating data of the electronic device to be completed and the adjacent electronic device in any time period before the time stamp corresponding to the missing data as the local data, input the adjacent data and the local data into the long short-term memory network, and obtain the completed data of the power electronic system; The abnormal alarm module is used to determine that an electronic device has a fault when the number of consecutive data loss and data transmission errors exceeds a set threshold, and notify the power station manager or owner to issue an alarm.

6. An electronic device, comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for completing missing data of a power electronic system according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps of the method for completing missing data of a power electronic system as described in any one of claims 1 to 4.

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