Method and system for verifying broadband impedance characteristic model of wind turbine generator

Abstract

The invention discloses a method and system for verifying a broadband impedance characteristic model of a wind turbine generator, and belongs to the technical field of new energy power generation. The method comprises the steps that a simulation working condition is set, under the set simulation working condition, a to-be-verified wind turbine generator broadband impedance characteristic model is used for model simulation operation, and disturbance is injected in the model simulation operation process; collecting model simulation data in a model simulation operation process, extracting a disturbance component from the model simulation data, and calculating an impedance value based on the disturbance component; and based on the impedance value, verifying the accuracy of the broadband impedance characteristic model of the wind turbine generator to be verified. According to the method, the accuracy of the wind turbine generator model can be effectively verified through model simulation, so that the accuracy of new energy grid-connected stability analysis is improved, and the technical progress and safe and rapid development of the industry are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy power generation, and more specifically, to a method and system for verifying a broadband impedance characteristic model of a wind turbine generator set. Background Art

[0002] With the large-scale grid connection of renewable energy power generation and the widespread application of other large-capacity power electronic devices, the strength of the power grid in some local areas has weakened. The interaction between the high proportion of renewable energy and the weak power grid has led to frequent broadband oscillation accidents, posing severe challenges to the safe and stable operation of the power system.

[0003] GB / T 19963.1-2021 "Technical Regulations for Wind Farm Access to Power System Part 1: Onshore Wind Power" proposes that in cases such as when the short circuit of a wind farm is relatively low, a special study on the analysis of wind farm grid-connected sub / supersynchronous oscillation and prevention and control measures should be carried out. In addition, the impedance characteristic test of wind turbines has been incorporated into the grid adaptability test procedures for wind turbines. It can be foreseen that after the impedance characteristic test of a model of wind turbine, there will be a great demand for the simulation and evaluation of the impedance characteristics of the same series of units after changes in components such as blades, pitch control, main control system, and generators. Among them, the wind turbine impedance characteristic model verification method, which is the key to the evaluation, needs to be developed urgently. Summary of the invention

[0004] In view of the above problems, the present invention proposes a method for verifying a broadband impedance characteristic model of a wind turbine generator set, comprising:

[0005] Setting simulation conditions, under the set simulation conditions, using the broadband impedance characteristic model of the wind turbine to be verified to perform model simulation operation, and injecting disturbances during the model simulation operation;

[0006] Collecting model simulation data during the model simulation operation, extracting disturbance components from the model simulation data, and calculating impedance values ​​based on the disturbance components;

[0007] Based on the impedance value, the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified is verified.

[0008] Optionally, the method further includes: building a broadband impedance characteristic model of the wind turbine to be verified based on the wind turbine impedance characteristic test.

[0009] Optionally, set simulation conditions, including:

[0010] The reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands;

[0011] Among them, the low power area and the medium power area are limited power operation;

[0012] Wherein, the disturbance voltage injected into the disturbance under the simulation condition is injected into three frequency bands, and the disturbance voltage is divided into a positive sequence signal and a negative sequence signal.

[0013] Optionally, inject disturbances into the model during simulation, including:

[0014] Using the power grid disturbance simulation device, positive-sequence voltage disturbance and negative-sequence voltage disturbance of specified frequency and amplitude are injected during the model simulation process.

[0015] Optionally, the model simulation data collected during the model simulation operation process includes: low-voltage side data of the wind turbine step-up transformer;

[0016] The low-voltage side data of the wind turbine step-up transformer include: three-phase voltage, three-phase current and time.

[0017] Optionally, the disturbance components include: disturbance components of voltage and current.

[0018] Optionally, the impedance value calculated based on the disturbance component includes: a positive-sequence impedance value and a negative-sequence impedance value.

[0019] Optionally, the calculation formula for the positive sequence impedance value is as follows:

[0020]

[0021] Among them, Z pp (f p ) is the positive sequence impedance value, Δu p (f p ) is the positive sequence voltage disturbance component, Δi p (f p ) is the positive sequence current disturbance component.

[0022] Optionally, the negative sequence impedance value is calculated as follows:

[0023] When f p <2f1:

[0024] When f p When ≥2f1:

[0025]

[0026] Among them, Z nn (f p ) is the negative sequence impedance value, Δu p (2f1-f p ) is the positive sequence voltage disturbance component, Δi p(2f1-f p ) is the positive sequence current disturbance component, Δu n (f p -2f1) is the negative sequence voltage disturbance component, Δi n (f p -2f1) is the negative sequence current disturbance component, f1 is the rated frequency, * is the complex conjugate, f p is the disturbance frequency.

[0027] Optionally, based on the impedance value, verifying the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified includes:

[0028] According to the test results of the impedance characteristics of the wind turbine generator set, the amplitude deviation and phase deviation of the impedance value are determined. If the amplitude deviation and phase deviation are within the preset deviation allowable value range, the broadband impedance characteristic model of the wind turbine generator set is accurate.

[0029] In another aspect, the present invention further proposes a system for verifying a broadband impedance characteristic model of a wind turbine generator set, comprising:

[0030] A simulation unit is used to set simulation conditions, and under the set simulation conditions, use the broadband impedance characteristic model of the wind turbine to be verified to perform model simulation operation, and inject disturbances during the model simulation operation;

[0031] A calculation unit, used for collecting model simulation data during the model simulation operation, extracting disturbance components from the model simulation data, and calculating impedance values ​​based on the disturbance components;

[0032] A verification unit is used to verify the accuracy of the broadband impedance characteristic model of the wind turbine to be verified based on the impedance value.

[0033] Optionally, the simulation unit is also used to: build a broadband impedance characteristic model of the wind turbine to be verified based on the impedance characteristic test of the wind turbine.

[0034] Optionally, set simulation conditions, including:

[0035] The reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands;

[0036] Among them, the low power area and the medium power area are limited power operation;

[0037] Wherein, the disturbance voltage injected into the disturbance under the simulation condition is injected into three frequency bands, and the disturbance voltage is divided into a positive sequence signal and a negative sequence signal.

[0038] Optionally, inject disturbances into the model during simulation, including:

[0039] Using the power grid disturbance simulation device, positive-sequence voltage disturbance and negative-sequence voltage disturbance of specified frequency and amplitude are injected during the model simulation process.

[0040] Optionally, the model simulation data collected during the model simulation operation process includes: low-voltage side data of the wind turbine step-up transformer;

[0041] The low-voltage side data of the wind turbine step-up transformer include: three-phase voltage, three-phase current and time.

[0042] Optionally, the disturbance components include: disturbance components of voltage and current.

[0043] Optionally, the impedance value calculated based on the disturbance component includes: a positive-sequence impedance value and a negative-sequence impedance value.

[0044] Optionally, the calculation formula for the positive sequence impedance value is as follows:

[0045]

[0046] Among them, Z pp (f p ) is the positive sequence impedance value, Δu p (f p ) is the positive sequence voltage disturbance component, Δi p (f p ) is the positive sequence current disturbance component.

[0047] Optionally, the negative sequence impedance value is calculated as follows:

[0048] When f p <2f1:

[0049]

[0050] When f p When ≥2f1:

[0051]

[0052] Among them, Z nn (f p ) is the negative sequence impedance value, Δu p (2f1-f p ) is the positive sequence voltage disturbance component, Δi p (2f1-f p ) is the positive sequence current disturbance component, Δu n (f p -2f1) is the negative sequence voltage disturbance component, Δi n (fp -2f1) is the negative sequence current disturbance component, f1 is the rated frequency, * is the complex conjugate, f p is the disturbance frequency.

[0053] Optionally, based on the impedance value, verifying the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified includes:

[0054] According to the test results of the impedance characteristics of the wind turbine generator set, the amplitude deviation and phase deviation of the impedance value are determined. If the amplitude deviation and phase deviation are within the preset deviation allowable value range, the broadband impedance characteristic model of the wind turbine generator set is accurate.

[0055] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0056] a processor for executing one or more programs;

[0057] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0058] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] The present invention provides a method for verifying a broadband impedance characteristic model of a wind turbine generator set, comprising: setting a simulation condition, under the set simulation condition, using a broadband impedance characteristic model of a wind turbine generator set to be verified to perform model simulation operation, and injecting disturbances during the model simulation operation; collecting model simulation data during the model simulation operation, extracting disturbance components from the model simulation data, and calculating impedance values ​​based on the disturbance components; based on the impedance values, verifying the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified. The present invention can effectively verify the accuracy of the wind turbine generator set model through model simulation, thereby improving the accuracy of the stability analysis of new energy grid connection, and promoting technological progress and safe and rapid development of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a flow chart of the method of the present invention;

[0062] Figure 2 is a flow chart of an embodiment of the method of the present invention;

[0063] Figure 3 A model structure diagram of an embodiment of the method of the present invention;

[0064] Figure 4It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0065] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0066] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0067] Embodiment 1:

[0068] The present invention proposes a method for verifying a broadband impedance characteristic model of a wind turbine generator system. Figure 1 As shown, including:

[0069] Step 1: Set simulation conditions. Under the set simulation conditions, use the broadband impedance characteristic model of the wind turbine to be verified to perform model simulation operation, and inject disturbance during the model simulation operation;

[0070] Step 2: collecting model simulation data during the model simulation operation, extracting disturbance components from the model simulation data, and calculating impedance values ​​based on the disturbance components;

[0071] Step 3: Based on the impedance value, verify the accuracy of the broadband impedance characteristic model of the wind turbine to be verified.

[0072] The method also includes: based on the wind turbine impedance characteristic test, building a wide-band impedance characteristic model of the wind turbine to be verified.

[0073] The simulation conditions are set up, including:

[0074] The reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands;

[0075] Among them, the low power area and the medium power area are limited power operation;

[0076] Wherein, the disturbance voltage injected into the disturbance under the simulation condition is injected into three frequency bands, and the disturbance voltage is divided into a positive sequence signal and a negative sequence signal.

[0077] Among them, the disturbances injected during the model simulation include:

[0078] Using the power grid disturbance simulation device, positive-sequence voltage disturbance and negative-sequence voltage disturbance of specified frequency and amplitude are injected during the model simulation process.

[0079] Among them, the model simulation data collected during the model simulation operation process includes: low-voltage side data of the wind turbine step-up transformer;

[0080] The low-voltage side data of the wind turbine step-up transformer include: three-phase voltage, three-phase current and time.

[0081] The disturbance components include: disturbance components of voltage and current.

[0082] The impedance value calculated based on the disturbance component includes: a positive sequence impedance value and a negative sequence impedance value.

[0083] Among them, the calculation formula for calculating the positive sequence impedance value is as follows:

[0084]

[0085] Among them, Z pp (f p ) is the positive sequence impedance value, Δu p (f p ) is the positive sequence voltage disturbance component, Δi p (f p ) is the positive sequence current disturbance component.

[0086] Among them, the calculation formula for calculating the negative sequence impedance value is as follows:

[0087] When f p <2f1:

[0088]

[0089] When f p When ≥2f1:

[0090]

[0091] Among them, Z nn (f p ) is the negative sequence impedance value, Δu p (2f1-f p ) is the positive sequence voltage disturbance component, Δi p (2f1-f p) is the positive sequence current disturbance component, Δu n (f p -2f1) is the negative sequence voltage disturbance component, Δi n (f p -2f1) is the negative sequence current disturbance component, f1 is the rated frequency, * is the complex conjugate, f p is the disturbance frequency.

[0092] Wherein, based on the impedance value, verifying the accuracy of the broadband impedance characteristic model of the wind turbine to be verified includes:

[0093] According to the test results of the impedance characteristics of the wind turbine generator set, the amplitude deviation and phase deviation of the impedance value are determined. If the amplitude deviation and phase deviation are within the preset deviation allowable value range, the broadband impedance characteristic model of the wind turbine generator set is accurate.

[0094] The present invention is further described below with reference to specific cases:

[0095] Specific case flow, such as Figure 2 As shown, including:

[0096] Based on the impedance characteristic test of wind turbines, an electromagnetic transient model of wind turbines is built. The model adopts a joint simulation model of Bladed mechanical model and Matlab electrical model. The model includes components that have a significant impact on the grid performance during normal operation and fault operation of wind turbines, as well as control, safety and fault protection modules. The power grid simulation device model generates broadband voltage disturbances to provide conditions for impedance characteristic simulation. The data collection point is located on the low-voltage side of the step-up transformer. The structural diagram of the wind turbine simulation model is shown in the figure. Figure 3 shown.

[0097] The simulation conditions are set, the reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area, among which the low power area and medium power area are limited power operation. The simulation conditions of the wind turbine are shown in Table 1.

[0098] Table 1

[0099]

[0100] The disturbance voltage is divided into positive sequence signal and negative sequence signal. For each simulation condition, the disturbance voltage is injected into three frequency bands, namely 1-9Hz, 10-100Hz, and 110-1000Hz. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands. Figure 2 shown.

[0101] Table 2

[0102]

[0103] Under the conditions of rated voltage and rated frequency, the wind turbine generator system operates normally, and in the low power area P = 0.1P n , Medium power area P = 0.5P n , High power area P = 1.0P n Simulate the broadband impedance characteristics of wind turbines.

[0104] According to Table 2, in the 1-9 Hz frequency range, the injection amplitude is 0.2% U n The positive sequence disturbance voltage is 1Hz in frequency step and 7s in duration at each frequency point. In the 10-100Hz frequency range, the injection amplitude is 0.5%U n The positive sequence disturbance voltage is 1Hz in frequency step and 7s in duration at each frequency point. In the frequency range of 110-1000Hz, the injection amplitude is 2%U n The positive sequence disturbance voltage is 10 Hz in frequency step and the duration of each frequency point is 7 s.

[0105] According to Table 2, in the 10-100 Hz frequency range, the injection amplitude is 0.5% U n The negative sequence disturbance voltage has a frequency step of 10 Hz and a duration of 7 s at each frequency point. In the 110-1000 Hz frequency band, the injection amplitude is 2% U n The negative sequence disturbance voltage has a frequency step of 10 Hz and each frequency point lasts for 7 seconds.

[0106] The simulation collects the low-voltage side data of the wind turbine step-up transformer, including three-phase voltage, three-phase current, and time, with a sampling frequency of no less than 5kHz.

[0107] Based on the voltage and current data collected by the positive sequence disturbance voltage injection, the positive sequence voltage disturbance component Δu is extracted using the Fourier transform algorithm p (f p ), positive sequence current disturbance component Δi p (f p ), calculate the positive sequence impedance value Z pp (f p ), the formula is as follows:

[0108]

[0109] Based on the voltage and current acquisition data of negative-sequence disturbance voltage injection, negative-sequence impedance calculation is carried out, which is divided into two cases.

[0110] The first case: when f p <2f1, extract the positive sequence voltage disturbance component Δu p (2f1-f p ), positive sequence current disturbance component Δi p (2f1-fp ), calculate the negative sequence impedance value Z nn (f p ), the formula is as follows:

[0111]

[0112] Where f1 is the rated frequency, “*” indicates the complex conjugate, and f p is the disturbance frequency.

[0113] The second case: When f p ≥2f1, extract the negative sequence voltage disturbance component Δu n (f p -2f1), negative sequence current disturbance component Δi n (f p -2f1), calculate the negative sequence impedance value Z nn (f p ), the formula is as follows:

[0114]

[0115] Based on the test results of wind turbine impedance characteristics, the accuracy of wind turbine simulation model impedance characteristics is checked. If the amplitude deviation and phase deviation of the impedance are within the preset deviation allowable range, the wind turbine simulation model impedance characteristics are consistent with the test wind turbine, otherwise they are inconsistent. The maximum allowable value of impedance characteristic deviation is shown in Table 3.

[0116] Table 3

[0117] Impedance Amplitude Deviation Impedance Phase Deviation ±10db ±10°

[0118] In order to solve the problem that there will be a great demand for impedance characteristic simulation evaluation of the same series of wind turbines based on wind turbine impedance characteristic test in the near future, the present invention provides a practical, simple and accurate model verification method for impedance characteristic model verification of the key evaluation step, ensuring that the electrical model of the wind turbine is consistent with the broadband impedance characteristics of the actual wind turbine. At the same time, an accurate wind turbine model is provided for conducting wind farm impedance characteristic evaluation, improving the accuracy of new energy grid-connected stability analysis, and promoting technological progress and safe and rapid development of the industry.

[0119] Embodiment 2:

[0120] The present invention also proposes a system 200 for verifying a broadband impedance characteristic model of a wind turbine generator system, such as Figure 4 As shown, including:

[0121] The simulation unit 201 is used to set a simulation condition, and under the set simulation condition, use the broadband impedance characteristic model of the wind turbine to be verified to perform model simulation operation, and inject disturbance during the model simulation operation process;

[0122] The calculation unit 202 is used to collect model simulation data during the model simulation operation, extract disturbance components from the model simulation data, and calculate the impedance value based on the disturbance components;

[0123] The verification unit 203 is used to verify the accuracy of the broadband impedance characteristic model of the wind turbine to be verified based on the impedance value.

[0124] The simulation unit 201 is also used to build a broadband impedance characteristic model of the wind turbine to be verified based on the impedance characteristic test of the wind turbine.

[0125] The simulation conditions are set up, including:

[0126] The reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands;

[0127] Among them, the low power area and the medium power area are limited power operation;

[0128] Wherein, the disturbance voltage injected into the disturbance under the simulation condition is injected into three frequency bands, and the disturbance voltage is divided into a positive sequence signal and a negative sequence signal.

[0129] Among them, the disturbances injected during the model simulation include:

[0130] Using the power grid disturbance simulation device, positive-sequence voltage disturbance and negative-sequence voltage disturbance of specified frequency and amplitude are injected during the model simulation process.

[0131] Among them, the model simulation data collected during the model simulation operation process includes: low-voltage side data of the wind turbine step-up transformer;

[0132] The low-voltage side data of the wind turbine step-up transformer include: three-phase voltage, three-phase current and time.

[0133] The disturbance components include: disturbance components of voltage and current.

[0134] The impedance value calculated based on the disturbance component includes: a positive sequence impedance value and a negative sequence impedance value.

[0135] Among them, the calculation formula for calculating the positive sequence impedance value is as follows:

[0136]

[0137] Among them, Z pp (f p ) is the positive sequence impedance value, Δu p (f p) is the positive sequence voltage disturbance component, Δi p (f p ) is the positive sequence current disturbance component.

[0138] Among them, the calculation formula for calculating the negative sequence impedance value is as follows:

[0139] When f p <2f1:

[0140]

[0141] When f p When ≥2f1:

[0142]

[0143] Among them, Z nn (f p ) is the negative sequence impedance value, Δu p (2f1-f p ) is the positive sequence voltage disturbance component, Δi p (2f1-f p ) is the positive sequence current disturbance component, Δu n (f p -2f1) is the negative sequence voltage disturbance component, Δi n (f p -2f1) is the negative sequence current disturbance component, f1 is the rated frequency, * is the complex conjugate, f p is the disturbance frequency.

[0144] Wherein, based on the impedance value, verifying the accuracy of the broadband impedance characteristic model of the wind turbine to be verified includes:

[0145] According to the test results of the impedance characteristics of the wind turbine generator set, the amplitude deviation and phase deviation of the impedance value are determined. If the amplitude deviation and phase deviation are within the preset deviation allowable value range, the broadband impedance characteristic model of the wind turbine generator set is accurate.

[0146] The present invention can effectively verify the accuracy of the wind turbine model through model simulation, thereby improving the accuracy of new energy grid-connected stability analysis and promoting technological progress and safe and rapid development of the industry.

[0147] Embodiment 3:

[0148] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or 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. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0149] Embodiment 4:

[0150] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0151] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0152] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0153] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0154] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0155] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0156] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for verifying a broadband impedance characteristic model of a wind turbine generator system, characterized in that: include: Setting simulation conditions, under the set simulation conditions, using the broadband impedance characteristic model of the wind turbine to be verified to perform model simulation operation, and injecting disturbances during the model simulation operation; Collecting model simulation data during the model simulation operation, extracting disturbance components from the model simulation data, and calculating impedance values ​​based on the disturbance components; Based on the impedance value, the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified is verified.

2. The method according to claim 1, characterized in that The method further includes: building a broadband impedance characteristic model of the wind turbine to be verified based on the wind turbine impedance characteristic test.

3. The method according to claim 1, characterized in that The setting of simulation working conditions includes: The reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands; Among them, the low power area and the medium power area are limited power operation; Wherein, the disturbance voltage injected into the disturbance under the simulation condition is injected into three frequency bands, and the disturbance voltage is divided into a positive sequence signal and a negative sequence signal.

4. The method according to claim 1, characterized in that The injecting disturbance during the model simulation operation includes: Using the power grid disturbance simulation device, positive-sequence voltage disturbance and negative-sequence voltage disturbance of specified frequency and amplitude are injected during the model simulation process.

5. The method according to claim 1, characterized in that The model simulation data collected during the model simulation operation process include: low-voltage side data of the wind turbine step-up transformer; The low-voltage side data of the wind turbine step-up transformer include: three-phase voltage, three-phase current and time.

6. The method according to claim 1, characterized in that The disturbance components include: disturbance components of voltage and current.

7. The method according to claim 1, characterized in that The impedance value calculated based on the disturbance component includes: a positive sequence impedance value and a negative sequence impedance value.

8. The method according to claim 7, characterized in that The calculation formula for the positive sequence impedance value is as follows: Among them, Z pp (f p ) is the positive sequence impedance value, Δu p (f p ) is the positive sequence voltage disturbance component, Δi p (f p ) is the positive sequence current disturbance component.

9. The method according to claim 7, characterized in that: The calculation formula for calculating the negative sequence impedance value is as follows: When fp<2f1: When f p When ≥2f1: Among them, Z nn (f p ) is the negative sequence impedance value, Δu p (2f1-f p ) is the positive sequence voltage disturbance component, Δi p (2f1-f p ) is the positive sequence current disturbance component, Δu n (f p -2f1) is the negative sequence voltage disturbance component, Δi n (f p -2f1) is the negative sequence current disturbance component, f1 is the rated frequency, * is the complex conjugate, f p is the disturbance frequency.

10. The method according to claim 1, characterized in that The verifying the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified based on the impedance value includes: According to the test results of the impedance characteristics of the wind turbine generator set, the amplitude deviation and phase deviation of the impedance value are determined. If the amplitude deviation and phase deviation are within the preset deviation allowable value range, the broadband impedance characteristic model of the wind turbine generator set is accurate.

11. A system for verifying a broadband impedance characteristic model of a wind turbine generator system, characterized in that: include: A simulation unit is used to set simulation conditions, and under the set simulation conditions, use the broadband impedance characteristic model of the wind turbine to be verified to perform model simulation operation, and inject disturbances during the model simulation operation; A calculation unit, used for collecting model simulation data during the model simulation operation, extracting disturbance components from the model simulation data, and calculating impedance values ​​based on the disturbance components; A verification unit is used to verify the accuracy of the broadband impedance characteristic model of the wind turbine to be verified based on the impedance value.

12. The system according to claim 11, characterized in that The simulation unit is also used to: build a broadband impedance characteristic model of the wind turbine to be verified based on the wind turbine impedance characteristic test.

13. The system according to claim 11, characterized in that The setting of simulation working conditions includes: The reactive output of the wind turbine is set to 0, and the active output is divided into low power area, medium power area and high power area. The disturbance voltage amplitude, disturbance frequency step and duration are set according to the positive and negative sequence disturbance voltage signals and different frequency bands; Among them, the low power area and the medium power area are limited power operation; Wherein, the disturbance voltage injected into the disturbance under the simulation condition is injected into three frequency bands, and the disturbance voltage is divided into a positive sequence signal and a negative sequence signal.

14. The system according to claim 11, characterized in that The injecting disturbance during the model simulation operation includes: Using the power grid disturbance simulation device, positive-sequence voltage disturbance and negative-sequence voltage disturbance of specified frequency and amplitude are injected during the model simulation process.

15. The system according to claim 11, characterized in that The model simulation data collected during the model simulation operation process include: low-voltage side data of the wind turbine step-up transformer; The low-voltage side data of the wind turbine step-up transformer include: three-phase voltage, three-phase current and time.

16. The system according to claim 11, characterized in that The disturbance components include: disturbance components of voltage and current.

17. The system according to claim 11, characterized in that The impedance value calculated based on the disturbance component includes: a positive sequence impedance value and a negative sequence impedance value.

18. The system according to claim 17, characterized in that The calculation formula for the positive sequence impedance value is as follows: Among them, Z pp (f p ) is the positive sequence impedance value, Δu p (f p ) is the positive sequence voltage disturbance component, Δi p (f p ) is the positive sequence current disturbance component.

19. The system according to claim 17, characterized in that The calculation formula for calculating the negative sequence impedance value is as follows: When f p <2f1: When f p When ≥2f1: Among them, Z nn (f p ) is the negative sequence impedance value, Δu p (2f1-f p ) is the positive sequence voltage disturbance component, Δi p (2f1-f p ) is the positive sequence current disturbance component, Δu n (f p -2f1) is the negative sequence voltage disturbance component, Δi n (f p -2f1) is the negative sequence current disturbance component, f1 is the rated frequency, * is the complex conjugate, f p is the disturbance frequency.

20. The system according to claim 11, characterized in that The verifying the accuracy of the broadband impedance characteristic model of the wind turbine generator set to be verified based on the impedance value includes: According to the test results of the impedance characteristics of the wind turbine generator set, the amplitude deviation and phase deviation of the impedance value are determined. If the amplitude deviation and phase deviation are within the preset deviation allowable value range, the broadband impedance characteristic model of the wind turbine generator set is accurate.

21. A computer device, characterized in that: include: One or more processors: A processor that executes one or more programs: When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 10 is implemented.

22. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 10 is implemented.

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