Photovoltaic inverter power generation harmonic characteristic experimental simulation method and device and computer equipment

Abstract

The embodiment of the application discloses a photovoltaic inverter power generation harmonic characteristic experiment simulation method and device and computer equipment. The method comprises the following steps: selecting an experiment type; obtaining a recording file according to the experiment type; analyzing the recording file to obtain transient data and steady-state data; and performing grid-connected power generation simulation according to the transient data and the steady-state data. The method can restore an occasional fault or event, and facilitate research on the power quality characteristics of a photovoltaic inverter.

Description

TECHNICAL FIELD

[0001] The present application relates to power generation harmonics, more particularly to a photovoltaic inverter power generation harmonic characteristic experiment simulation method and device and computer equipment. BACKGROUND

[0002] Harmonics refer to the current containing the frequency of the integer multiple of the fundamental wave, generally refers to the Fourier series decomposition of the periodic non-sinusoidal electric quantity, and the electric quantity generated by the current greater than the fundamental frequency. In a broad sense, since the effective component of the alternating current network is a single frequency of the power frequency, any component different from the power frequency can be called a harmonic.

[0003] There are harmonics in photovoltaic inverter power generation, and the current photovoltaic inverter power generation harmonic characteristic experiment simulation cannot restore occasional faults or events, which is not convenient for studying the power quality characteristics of the photovoltaic inverter.

[0004] Therefore, it is necessary to design a new method to restore occasional faults or events and facilitate the study of the power quality characteristics of the photovoltaic inverter. SUMMARY

[0005] The purpose of the present application is to overcome the defects of the prior art and provide a photovoltaic inverter power generation harmonic characteristic experiment simulation method and device and computer equipment.

[0006] To achieve the above purpose, the present application adopts the following technical scheme: a photovoltaic inverter power generation harmonic characteristic experiment simulation method, comprising:

[0007] selecting an experiment type;

[0008] obtaining a recording file according to the experiment type;

[0009] parsing the recording file to obtain transient data and steady-state data

[0010] According to the transient data and the steady-state data, the grid-connected power generation simulation is performed.

[0011] Further technical solutions are as follows: the experiment file is obtained according to the experiment type, comprising:

[0012] When the experiment type is a type of only studying the conventional power quality characteristics of photovoltaic power generation, an original recording comtrad file is obtained to form a recording file;

[0013] When the experiment type is a type of studying the fault characteristics in the photovoltaic power generation process, a comtrad file with added fault signals is obtained to form a recording file;

[0014] When the experiment type is the type of simulating photovoltaic power generation characteristics under specific weather conditions, a preset typical comtrad file is selected to form a recording file.

[0015] Further technical solutions of the application are as follows: the fault signal comprises at least one of a voltage sag signal and a harmonic over-limit signal.

[0016] Further technical solutions of the application are as follows: the analyzing of the recording file to obtain transient data and steady-state data comprises:

[0017] The effective value of each phase in the recording file, the corresponding curve and the included angle between each phase are calculated by using a data statistics and effective value calculation method to obtain a calculation result.

[0018] The fault in the calculation result is automatically determined by an effective value setting value, and the fault occurrence time and duration are obtained.

[0019] The detailed fault waveform in the recording file is intercepted to obtain transient data.

[0020] The transient data in the recording file is removed, and the effective value curve obtained by statistics is stored to obtain steady-state data.

[0021] Further technical solutions of the application are as follows: before the grid-connected power generation simulation according to the transient data and the steady-state data, the method further comprises:

[0022] The transient data and the steady-state data are stored.

[0023] Further technical solutions of the application are as follows: the grid-connected power generation simulation according to the transient data and the steady-state data comprises:

[0024] The power is taken from an energy storage battery according to the transient data and the steady-state data by using a DSP, and a hysteresis control power electronic switching device is used to perform a grid-connected power generation simulation process.

[0025] The application also provides a photovoltaic inverter power generation harmonic characteristic experiment simulation device, comprising:

[0026] A type selection unit is configured to select an experiment type.

[0027] A file acquisition unit is configured to acquire a recording file according to the experiment type.

[0028] An analysis unit is configured to analyze the recording file to obtain transient data and steady-state data.

[0029] A simulation unit is configured to perform grid-connected power generation simulation according to the transient data and the steady-state data.

[0030] A further technical scheme of the application is that the file acquisition unit is configured to acquire a raw comtrad file to form a recording wave file when the experiment type is a type of studying only conventional power quality characteristics of photovoltaic power generation, acquire a comtrad file with added fault signals to form a recording wave file when the experiment type is a type of studying fault characteristics in the process of photovoltaic power generation, and select a preset typical comtrad file to form a recording wave file when the experiment type is a type of simulating photovoltaic power generation characteristics under specific weather conditions.

[0031] A further technical scheme of the application is that the analysis unit comprises:

[0032] A calculation subunit is configured to calculate effective values of each phase, corresponding curves and angles between each phase in the recording wave file by using a data statistics and effective value calculation method to obtain a calculation result.

[0033] A fault determination subunit is configured to automatically determine a fault in the calculation result by using an effective value setting value, and acquire a fault occurrence time and duration.

[0034] A cutting subunit is configured to cut detailed fault waveforms in the recording wave file to obtain transient data.

[0035] A removal subunit is configured to remove the transient data in the recording wave file, and store the recording wave file according to the statistical effective value curve to obtain steady-state data.

[0036] The application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the above method when executing the computer program.

[0037] Compared with the prior art, the application has the beneficial effects that the application determines corresponding recording wave files according to selected experiment types, analyzes the recording wave files to determine steady-state data and transient data, combines a DSP, the transient data and the steady-state data to perform grid-connected power generation simulation, restores occasional faults or events, and facilitates the study of photovoltaic power quality characteristics.

[0038] The application will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical scheme of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0040] Figure 1An application scenario schematic diagram of the photovoltaic inverter power generation harmonic characteristic experimental simulation method provided by the embodiment of the present application is provided.

[0041] Figure 2 A flowchart of the photovoltaic inverter power generation harmonic characteristic experimental simulation method provided by the embodiment of the present application is provided.

[0042] Figure 3 A sub-flowchart of the photovoltaic inverter power generation harmonic characteristic experimental simulation method provided by the embodiment of the present application is provided.

[0043] Figure 4 A schematic block diagram of the photovoltaic inverter power generation harmonic characteristic experimental simulation device provided by the embodiment of the present application is provided.

[0044] Figure 5 A schematic block diagram of the analysis unit of the photovoltaic inverter power generation harmonic characteristic experimental simulation device provided by the embodiment of the present application is provided.

[0045] Figure 6 A schematic block diagram of the computer device provided by the embodiment of the present application is provided. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0047] It should be understood that, when used in the specification and the appended claims, the terms “comprise” and “include” indicate the presence of described features, integers, steps, operations, elements, and / or components but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0048] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms “a”, “an” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0049] It should be further understood that the term “and / or” used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0050] Please refer to Figure 1 and Figure 2 ,Figure 1 An application scenario schematic diagram of the photovoltaic inverter power generation harmonic characteristic experimental simulation method provided by the embodiment of the present application is provided. Figure 2 A schematic flowchart of the photovoltaic inverter power generation harmonic characteristic experimental simulation method provided by the embodiment of the present application is provided. The photovoltaic inverter power generation harmonic characteristic experimental simulation method is applied to a server, which interacts with a power electronic switching device. After selecting an experimental type, corresponding recording file is obtained, and the recording file is analyzed to form transient data and steady-state data, so that the transient data and the steady-state data are used to simulate grid-connected power generation together with the power electronic switching device.

[0051] Figure 2 A flowchart of the photovoltaic inverter power generation harmonic characteristic experimental simulation method provided by the embodiment of the present application is provided. As shown in Figure 2 the method comprises the following steps S110-S150.

[0052] S110, selecting an experimental type.

[0053] In the embodiment, the experimental type includes a type of studying only conventional power quality characteristics of photovoltaic power generation, a type of studying fault characteristics in the process of photovoltaic power generation, and a type of simulating photovoltaic power generation characteristics under specific weather conditions.

[0054] Before the experimental simulation is performed, the experimental type needs to be selected first, so that corresponding files can be obtained to analyze transient data and steady-state data.

[0055] S120, obtaining a recording file according to the experimental type.

[0056] In the embodiment, the recording file refers to a comtrad file required by the experiment.

[0057] Specifically, when the experimental type is the type of studying only conventional power quality characteristics of photovoltaic power generation, an original recording comtrad file is obtained to form the recording file; when the experimental type is the type of studying fault characteristics in the process of photovoltaic power generation, a comtrad file with added fault signals is obtained to form the recording file; and when the experimental type is the type of simulating photovoltaic power generation characteristics under specific weather conditions, a preset typical comtrad file is selected to form the recording file. The recording file determined according to different experimental types can realize restoration of occasional faults or events.

[0058] The specific weather conditions are, for example, conditions of 8 o'clock sunrise and 17 o'clock sunset. The fault signals include at least one of a voltage sag signal and a harmonic over-limit signal. Selecting a preset typical comtrad file refers to selecting a conventional typical comtrad file of preset photovoltaic characteristics.

[0059] S130, parsing the recording file to obtain transient data and steady-state data.

[0060] Specifically, the voltage / current mutation signal (mutation of effective value) is detected from 100 ms before the mutation point. The effective value is continuously stable for 5 cycles as a steady state, and is used to extract transient data.

[0061] In the embodiment, the steady-state data includes voltage amplitude change curve data, power change curve data, power factor change curve data, and harmonic value change data, mainly for extracting comtrad effective information and saving storage space; the transient data includes complete waveform point data (set to 128 points / s sampling rate) in the fault period, and a full restoration strategy is used to restore irregular waveforms in non-steady state.

[0062] In an embodiment, referring to Figure 3 The above step S130 can include steps S131-S134.

[0063] S131, calculating the effective value of each phase in the recording file, the corresponding curve, and the angle between each phase by using a data statistics and effective value calculation method, to obtain a calculation result.

[0064] In the embodiment, the calculation result refers to the effective value of each phase in the recording file, the corresponding curve, and the angle between each phase.

[0065] The data statistics and effective value calculation method belong to the prior art, which will not be described here.

[0066] S132, automatically determining the fault in the calculation result by setting the effective value, and obtaining the fault occurrence time and duration;

[0067] S133, intercepting the detailed fault waveform in the recording file to obtain transient data;

[0068] S134, removing the transient data in the recording file, and storing according to the statistical effective value curve to obtain steady-state data.

[0069] After opening the recording file, the data statistics and effective value calculation method are used to calculate the effective value (RMS (Root Mean Square) curve) of each phase (Ua, Ub, Uc, Ia, Ib, Ic) in the recording file and the angle between each phase. By setting the effective value, the fault is automatically determined, for example, Ua is less than 70% of the rated value, the fault occurrence time and duration are recorded, the detailed fault waveform of the recording file is intercepted and stored, and such data is transient data; the other waveform part, i.e. the non-fault waveform part, is stored according to the statistical effective value curve, which is steady-state data.

[0070] Since the recording file is large in recording file data amount per minute, the steady-state data must be stripped and converted into a form of data that can be actively controlled by DSP (Digital Signal Process), and the transient data does not have a rule due to the contingency of faults, and the fault waveform generally maintains for a short time, and DSP can meet the storage and reproduction mode.

[0071] S140, store the transient data and the steady-state data.

[0072] In the embodiment, the transient data and the steady-state data are stored in fragments.

[0073] S150, perform grid-connected power generation simulation according to the transient data and the steady-state data.

[0074] In the embodiment, the DSP is used to take power from the energy storage battery according to the transient data and the steady-state data, and the hysteresis control power electronic switching device is used to perform the grid-connected power generation simulation process.

[0075] Specifically, the DSP triggers a modulation signal to obtain a simulated power generation signal, and the energy storage inverter synchronously simulates power generation.

[0076] The steady-state data and the transient data obtained through the above processing are transmitted to the inverter DSP, so that the inverter completes the inverter power generation process according to the existing data, instead of the conventional inverter automatic grid-connected power generation mode, which can easily enable photovoltaic researchers to obtain a real photovoltaic power generation scene and easily reproduce the on-site fault.

[0077] The above photovoltaic inverter power generation harmonic characteristic experimental simulation method determines the corresponding recording file through the selected experimental type, analyzes the recording file to determine the steady-state data and the transient data, performs grid-connected power generation simulation in combination with the DSP, the transient data and the steady-state data, realizes the restoration of contingency faults or events, and facilitates the research on the power quality characteristics of photovoltaic.

[0078] Figure 4 is a schematic block diagram of a photovoltaic inverter power generation harmonic characteristic experimental simulation device 300 provided by an embodiment of the present application. As shown in Figure 4 According to the above photovoltaic inverter power generation harmonic characteristic experimental simulation method, the present application further provides a photovoltaic inverter power generation harmonic characteristic experimental simulation device 300. The photovoltaic inverter power generation harmonic characteristic experimental simulation device 300 includes units for performing the above photovoltaic inverter power generation harmonic characteristic experimental simulation method, and the device can be configured in a server. Specifically, please refer to Figure 4The photovoltaic inverter power generation harmonic characteristic experiment simulation device 300 comprises a type selection unit 301, a file acquisition unit 302, an analysis unit 303 and a simulation unit 305.

[0079] The type selection unit 301 is configured to select an experiment type; the file acquisition unit 302 is configured to acquire a recording file according to the experiment type; the analysis unit 303 is configured to analyze the recording file to obtain transient data and steady-state data; and the simulation unit 305 is configured to perform grid-connected power generation simulation according to the transient data and the steady-state data.

[0080] In an embodiment, the file acquisition unit 302 is configured to acquire an original recording comtrad file to form the recording file when the experiment type is a type of studying only conventional power quality characteristics of photovoltaic power generation; acquire a comtrad file to which a fault signal has been added to form the recording file when the experiment type is a type of studying fault characteristics in the process of photovoltaic power generation; and select a preset typical comtrad file to form the recording file when the experiment type is a type of simulating photovoltaic power generation characteristics under specific weather conditions.

[0081] In an embodiment, as shown in Figure 5 the analysis unit 303 comprises a calculation subunit 3031, a fault determination subunit 3032, a cutting subunit 3033 and a removal subunit 3034.

[0082] The calculation subunit 3031 is configured to calculate each-phase effective value, corresponding curves and angles between phases in the recording file by using data statistics and effective value calculation methods to obtain calculation results; the fault determination subunit 3032 is configured to automatically determine faults in the calculation results by using effective value setting values, and acquire fault occurrence time and duration; the cutting subunit 3033 is configured to cut detailed fault waveforms in the recording file to obtain transient data; and the removal subunit 3034 is configured to remove the transient data in the recording file, and store the effective value curves according to statistics to obtain steady-state data.

[0083] In an embodiment, as shown in Figure 4 the photovoltaic inverter power generation harmonic characteristic experiment simulation device 300 further comprises a storage unit 304 configured to store the transient data and the steady-state data.

[0084] In an embodiment, the simulation unit 305 is configured to take power from an energy storage battery according to the transient data and the steady-state data by using a DSP, and perform a grid-connected power generation simulation process by using hysteresis control power electronic switching devices.

[0085] It should be noted that the specific implementation process of the photovoltaic inverter power generation harmonic characteristic experiment simulation device 300 and each unit can be clearly understood by those skilled in the art, and the corresponding description in the foregoing method embodiments can be referred to. For the convenience and brevity of description, it will not be repeated here.

[0086] The photovoltaic inverter power generation harmonic characteristic experiment simulation device 300 described above can be realized in the form of a computer program, which can run on a computer device as shown in the figure. Figure 6

[0087] Please refer to Figure 6 , Figure 6 is a schematic block diagram of a computer device provided by an embodiment of the present application. The computer device 500 can be a server, wherein the server can be a stand-alone server or a server cluster composed of multiple servers.

[0088] Referring to Figure 6 , the computer device 500 includes a processor 502, a memory, and a network interface 505 connected through a system bus 501, wherein the memory can include a non-volatile storage medium 503 and an internal memory 504.

[0089] The non-volatile storage medium 503 can store an operating system 5031 and a computer program 5032. The computer program 5032 includes program instructions which, when executed, can cause the processor 502 to perform a photovoltaic inverter power generation harmonic characteristic experiment simulation method.

[0090] The processor 502 is configured to provide computing and control capabilities to support the operation of the entire computer device 500.

[0091] The internal memory 504 provides an environment for the running of the computer program 5032 in the non-volatile storage medium 503, which, when executed by the processor 502, can cause the processor 502 to perform a photovoltaic inverter power generation harmonic characteristic experiment simulation method.

[0092] The network interface 505 is configured to perform network communication with other devices. Those skilled in the art can understand that Figure 6 the structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device 500 to which the scheme of the present application is applied. The specific computer device 500 can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0093] The processor 502 is configured to run the computer program 5032 stored in the memory to implement the following steps: ​

[0094] selecting an experiment type; obtaining a recorded wave file according to the experiment type; parsing the recorded wave file to obtain transient data and steady-state data; and performing grid-connected power generation simulation according to the transient data and the steady-state data.

[0095] The fault signal includes at least one of a voltage sag signal and a harmonic signal exceeding a standard.

[0096] In an embodiment, the processor 502, when implementing the step of obtaining an experiment file according to the experiment type, implements the following steps:

[0097] When the experiment type is a type of studying only conventional power quality characteristics of photovoltaic power generation, an original recorded wave comtrad file is obtained to form the recorded wave file; when the experiment type is a type of studying fault characteristics in the process of photovoltaic power generation, a comtrad file with added fault signals is obtained to form the recorded wave file; and when the experiment type is a type of simulating photovoltaic power generation characteristics under specific weather conditions, a preset typical comtrad file is selected to form the recorded wave file.

[0098] In an embodiment, the processor 502, when implementing the step of parsing the recorded wave file to obtain transient data and steady-state data, implements the following steps:

[0099] The effective values of each phase in the recorded wave file, corresponding curves and angles between each phase are calculated by using data statistics and effective value calculation methods to obtain calculation results; the calculation results are automatically judged for faults by using effective value setting values, and fault occurrence time and duration are obtained; detailed fault waveforms in the recorded wave file are intercepted to obtain transient data; and the transient data is removed from the recorded wave file, and the recorded wave file is stored according to the calculated effective value curves to obtain steady-state data.

[0100] In an embodiment, before implementing the step of performing grid-connected power generation simulation according to the transient data and the steady-state data, the processor 502 further implements the following step: storing the transient data and the steady-state data.

[0101] In an embodiment, the processor 502, when implementing the step of performing grid-connected power generation simulation according to the transient data and the steady-state data, implements the following steps:

[0102] Power is taken from an energy storage battery according to the transient data and the steady-state data by using a DSP, and a grid-connected power generation simulation process is performed by using hysteresis control power electronic switching devices.

[0103] It should be understood that in the embodiments of the present application, the processor 502 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0104] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the above-mentioned embodiments.

[0105] Therefore, the present application further provides a storage medium. The storage medium can be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program is executed by a processor to make the processor execute the following steps:

[0106] selecting an experiment type, obtaining a recorded wave file according to the experiment type, analyzing the recorded wave file to obtain transient data and steady-state data, and performing grid-connected power generation simulation according to the transient data and the steady-state data.

[0107] The fault signal includes at least one of a voltage sag signal and a harmonic signal exceeding a standard.

[0108] In an embodiment, when the processor executes the computer program to implement the step of obtaining an experiment file according to the experiment type, the processor specifically implements the following steps:

[0109] When the experiment type is a type of studying only conventional power quality characteristics of photovoltaic power generation, an original recorded wave comtrad file is obtained to form a recorded wave file; when the experiment type is a type of studying fault characteristics in the process of photovoltaic power generation, a comtrad file with added fault signals is obtained to form a recorded wave file; and when the experiment type is a type of simulating photovoltaic power generation characteristics under specific weather conditions, a preset typical comtrad file is selected to form a recorded wave file.

[0110] In an embodiment, the processor, when executing the computer program to implement the step of parsing the recording file to obtain transient data and steady-state data, implements the following steps:

[0111] The effective values of each phase in the recording file, corresponding curves and angles between each phase are calculated by using data statistics and effective value calculation method to obtain a calculation result; the fault in the calculation result is automatically determined by using an effective value setting value, and the fault occurrence time and duration are obtained; detailed fault waveforms in the recording file are intercepted to obtain transient data; the transient data is removed from the recording file, and the steady-state data is stored according to the statistical effective value curve.

[0112] In an embodiment, before the processor, when executing the computer program, implements the step of simulating grid-connected power generation according to the transient data and the steady-state data, the processor further implements the following steps:

[0113] The transient data and the steady-state data are stored.

[0114] In an embodiment, when the processor, when executing the computer program, implements the step of simulating grid-connected power generation according to the transient data and the steady-state data, the processor implements the following steps:

[0115] The power is taken from the energy storage battery according to the transient data and the steady-state data by using a DSP, and the process of simulating grid-connected power generation is performed by using hysteresis control power electronic switching devices.

[0116] The storage medium can be a U disk, a mobile hard disk, a read-only memory (ROM), a magnetic disk or an optical disk, and various computer readable storage media that can store program codes.

[0117] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0118] In several embodiments provided by the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the embodiments of the apparatus described above are merely schematic. For example, the division of the units is merely a logical function division. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In this way, the inventive idea can be implemented.

[0119] The steps in the method embodiments of the present application can be adjusted, combined and deleted in sequence according to actual needs. The units in the apparatus embodiments of the present application can be combined, divided and deleted according to actual needs. In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0120] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a storage medium. Based on such understanding, the technical solutions of the present application, essentially or in the contribution to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0121] The above describes only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An experimental simulation method for the harmonic characteristics of photovoltaic inverter power generation, characterized in that, include: Select the experiment type; Obtain the waveform recording file according to the experimental type; The recorded waveform file is parsed to obtain transient and steady-state data; Grid-connected power generation simulation is performed based on the transient data and the steady-state data; The step of obtaining the experiment file according to the experiment type includes: When the experiment type is one that only studies the conventional power quality characteristics of photovoltaic inverter power generation, the original waveform recording comtrad file is obtained to form a waveform recording file; When the experiment type is to study the fault characteristics in the photovoltaic inverter power generation process, obtain the comtrad file with added fault signals to form a waveform recording file; When the experiment type is to simulate the power generation characteristics of a photovoltaic inverter under specific weather conditions, select a preset typical comtrad file to generate a waveform file; The step of performing grid-connected power generation simulation based on the transient data and the steady-state data includes: The DSP draws power from the energy storage battery according to the transient and steady-state data, and uses hysteresis control of power electronic switching devices to simulate the grid-connected power generation process.

2. The experimental simulation method for the harmonic characteristics of photovoltaic inverter power generation according to claim 1, characterized in that, The fault signal includes at least one of the voltage sag signal and the harmonic over-limit signal.

3. The experimental simulation method for the harmonic characteristics of photovoltaic inverter power generation according to claim 1, characterized in that, The step of parsing the waveform file to obtain transient and steady-state data includes: The effective values ​​of each phase, the corresponding curves, and the angles between each phase in the waveform recording file are calculated using data statistics and effective value calculation methods to obtain the calculation results; The system automatically determines the faults within the calculation results based on the effective value setpoint, and obtains the fault occurrence time and duration. Detailed fault waveforms are extracted from the recorded waveform file to obtain transient data; Transient data is removed from the recorded waveform file and stored according to the statistical effective value curve to obtain steady-state data.

4. The experimental simulation method for the harmonic characteristics of photovoltaic inverter power generation according to claim 1, characterized in that, Before performing grid-connected power generation simulation based on the transient data and the steady-state data, the method further includes: Store the transient data and the steady-state data.

5. An experimental simulation device for the harmonic characteristics of photovoltaic inverter power generation, characterized in that, include: The type selection unit is used to select the experiment type; The file acquisition unit is used to acquire waveform recording files according to the experiment type. The parsing unit is used to parse the waveform file to obtain transient and steady-state data; The simulation unit is used to perform grid-connected power generation simulation based on the transient data and the steady-state data; The method for performing grid-connected power generation simulation based on the transient data and the steady-state data includes: performing grid-connected power generation simulation based on the transient data and the steady-state data; The file acquisition unit is used to acquire the original waveform recording comtrad file to form a waveform recording file when the experiment type is to study only the conventional power quality characteristics of photovoltaic power generation; to acquire a comtrad file with added fault signals to form a waveform recording file when the experiment type is to study the fault characteristics in the photovoltaic power generation process; and to select a preset typical comtrad file to form a waveform recording file when the experiment type is to simulate the characteristics of photovoltaic power generation under specific weather conditions. The parsing unit includes: The calculation subunit is used to calculate the effective value of each phase, the corresponding curve, and the angle between each phase in the waveform recording file using data statistics and effective value calculation methods, so as to obtain the calculation results; The fault determination subunit is used to automatically determine the faults within the calculation results based on the effective value setpoint, and to obtain the fault occurrence time and duration. The extraction subunit is used to extract detailed fault waveforms from the recorded waveform file to obtain transient data; The removal sub-unit is used to remove transient data from the waveform file and store it according to the statistical effective value curve to obtain steady-state data.

6. A computer device, characterized in that, The computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1 to 4.

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