A reactive power control method, system, device and storage medium based on a grid-type wind turbine generator set

Abstract

The present invention discloses a reactive power control method, system, device and storage medium based on a grid-type wind turbine generator set, which is applied to the field of new energy grid connection technology. The method includes acquiring data; processing the active power signal and its reference value using proportional-integral control to obtain a reference value of the d-axis component of the AC voltage; performing voltage and current double closed-loop vector processing on the reference value of the d-axis component of the AC voltage to obtain a modulation signal; determining a reactive power deviation value based on the reactive power signal and its reference value; inputting the reactive power deviation value into a dynamic droop coefficient relationship to obtain an angular frequency deviation signal; correcting the angular frequency deviation signal after parameter calibration to obtain a phase angle signal; performing coordinate transformation processing on the modulation signal to obtain the reactive modulation signal of the current wind turbine generator set; and executing a reactive power control strategy. The method provided in the embodiment of the present invention can realize the control of the reactive power between the wind turbines of the grid-type wind turbine generator set.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy grid connection, and in particular to a reactive power control method, system, device and storage medium based on a grid-connected wind turbine generator set. Background Art

[0002] With the continuous advancement of renewable energy technology, offshore wind power, as a clean and renewable form of energy, is gradually becoming an important part of energy.

[0003] In existing technologies, grid-connected wind turbines in offshore wind power transmission systems typically utilize a reactive power-frequency (Qf) droop control architecture. However, due to the inherent volatility and randomness of offshore wind power generation, when using Qf droop control, the reactive power of each wind turbine is always evenly distributed. This prevents wind turbines with low active power output from fully utilizing their reactive power regulation capabilities, thus affecting the stability of the offshore wind power transmission system.

[0004] It can be seen that how to control the reactive power between wind turbines of grid-type wind turbines to ensure the stability of offshore wind power transmission systems has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a reactive power control method, system, device and storage medium based on a grid-type wind turbine generator set to solve the technical problem that the reactive power of each wind turbine generator set is currently evenly distributed, resulting in the wind turbine generator set with low active output being unable to fully utilize its reactive power regulation capability, so as to realize the control of the reactive power between the wind turbines of the grid-type wind turbine generator set and ensure the stability of the offshore wind power transmission system.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a reactive power control method based on a grid-connected wind turbine generator system, the method comprising:

[0007] Obtain the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine;

[0008] Processing the active power signal and the active power signal reference value by using proportional-integral control to obtain a reference value of the AC voltage d-axis component of the current wind turbine generator set;

[0009] Performing voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal;

[0010] determining a reactive power deviation value based on the reactive power signal and the reactive power signal reference value;

[0011] Inputting the reactive power deviation value into the constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal;

[0012] The angular frequency deviation signal after parameter calibration is corrected using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal;

[0013] performing coordinate transformation processing on the first modulation signal and the second modulation signal by using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set;

[0014] A reactive power control strategy generated by the reactive modulation signal is executed.

[0015] As one preferred solution, the process of processing the active power signal and the active power signal reference value by using proportional-integral control to obtain the reference value of the AC voltage d-axis component of the current wind turbine generator system includes:

[0016] Obtaining an active power deviation based on the active power signal and the active power signal reference value;

[0017] The proportional and integral terms are processed using the open-loop transfer function to obtain a proportional-integral controller;

[0018] The active power deviation is input into the proportional-integral controller to obtain a reference value of the d-axis component of the AC voltage.

[0019] As one preferred solution, performing voltage-current dual closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain the first modulation signal and the second modulation signal includes:

[0020] Obtaining an AC voltage d-axis component, an AC voltage q-axis component, and an AC voltage q-axis component reference value;

[0021] performing voltage vector processing on the AC voltage d-axis component, the AC voltage q-axis component, the AC voltage q-axis component reference value, and the AC voltage d-axis component reference value to obtain an AC current d-axis component reference value and an AC current q-axis component reference value;

[0022] Obtaining the d-axis component of the alternating current and the q-axis component of the alternating current;

[0023] Current vector processing is performed on the AC current d-axis component, the AC current q-axis component, the AC current d-axis component reference value, and the AC current q-axis component reference value to obtain the first modulation signal and the second modulation signal.

[0024] As one preferred solution, the reactive power deviation value is input into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal, including:

[0025] The reactive power deviation value is input into a dynamic droop coefficient relationship formula constructed by the active power signal and a conventional droop coefficient to obtain the angular frequency deviation signal, wherein the angular frequency deviation signal is updated based on the real-time active power signal of the grid-type wind turbine.

[0026] As one preferred solution, the method of using a preset reactive-phase angle feedforward coefficient to correct the angular frequency deviation signal after parameter calibration to obtain a phase angle signal includes:

[0027] Get the angular frequency rating;

[0028] Calibrate the angular frequency deviation signal and the angular frequency rated value to obtain an angular frequency reference value;

[0029] The angular frequency reference value is corrected using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal.

[0030] As one preferred solution, the step of performing coordinate transformation processing on the first modulation signal and the second modulation signal using the phase angle signal to obtain the reactive modulation signal of the current wind turbine generator includes:

[0031] performing normalization processing on the first modulated signal and the second modulated signal to obtain aligned first modulated signal and second modulated signal;

[0032] The phase angle signal is used to perform inverse Park transform processing on the aligned first modulation signal and the second modulation signal to obtain a reactive modulation signal of the current wind turbine generator set.

[0033] As one preferred solution, after executing the reactive power control strategy generated by the reactive modulation signal, the reactive power control method based on the grid-connected wind turbine generator system further includes:

[0034] Obtaining an execution result of the reactive power control strategy;

[0035] A threshold analysis is performed on each signal in the execution result, a fault fluctuation is determined according to a preset threshold, and a wind turbine group number corresponding to the fault fluctuation is sent to a maintenance terminal.

[0036] Another embodiment of the present invention provides a reactive power control system based on a grid-connected wind turbine generator system, comprising:

[0037] An acquisition module is used to obtain the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine;

[0038] a control module, configured to process the active power signal and the active power signal reference value by using proportional-integral control to obtain a reference value of the d-axis component of the AC voltage of the current wind turbine generator set;

[0039] A vector processing module, configured to perform voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal;

[0040] a determining module, configured to determine a reactive power deviation value based on the reactive power signal and the reactive power signal reference value;

[0041] a calculation module, configured to input the reactive power deviation value into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal;

[0042] A correction module is used to correct the angular frequency deviation signal after parameter calibration using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal;

[0043] a transformation module, configured to perform coordinate transformation processing on the first modulation signal and the second modulation signal using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set;

[0044] An execution module is used to execute the reactive power control strategy generated by the reactive power modulation signal.

[0045] Another embodiment of the present invention provides a reactive power control device based on a grid-type wind turbine generator set, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the reactive power control method based on the grid-type wind turbine generator set as described above.

[0046] Yet another embodiment of the present invention provides a computer-readable storage medium storing a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the reactive power control method based on the grid-type wind turbine as described above is implemented.

[0047] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0048] The present invention obtains the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine generator set; uses proportional-integral control to process the active power signal and the active power signal reference value to obtain the reference value of the AC voltage d-axis component of the current wind turbine generator set; performs voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal; determines a reactive power deviation value based on the reactive power signal and the reactive power signal reference value; inputs the reactive power deviation value into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal; uses a preset reactive-phase angle feedforward coefficient to correct the parameter-calibrated angular frequency deviation signal to obtain a phase angle signal; uses the phase angle signal to perform coordinate transformation processing on the first modulation signal and the second modulation signal to obtain the reactive modulation signal of the current wind turbine generator set; and executes a reactive power control strategy generated by the reactive modulation signal. Compared with the existing technology, the present invention processes active power deviation through a proportional-integral controller, dynamically adjusts the reference value of the AC voltage d-axis component, stabilizes the DC bus or AC voltage level, provides a balanced voltage basis for reactive power distribution, performs current inner loop and voltage outer loop control based on at least the d-axis voltage reference value, quickly tracks instructions and decouples and adjusts the first modulation signal and the second modulation signal, ensures voltage stability in the dynamic process, and reduces cross-interference between active and reactive power; then compares the deviation between the actual reactive power and the reference value, quantifies the gap between the current reactive power output and the target, and drives subsequent dynamic droop control , the reactive deviation is input into the adaptive droop coefficient relationship to generate an angular frequency deviation signal. When the deviation is high, the droop coefficient is increased to encourage low-output wind turbines to bear more reactive power; the preset feedforward coefficient is used to perform phase compensation on the angular frequency deviation to offset the phase shift caused by reactive regulation; the d-axis and q-axis modulation signals are converted into components in the stationary coordinate system through inverse Park transform to generate a reactive modulation signal, and the generated reactive modulation signal is applied to the converter to dynamically balance the reactive power of each wind turbine, thereby realizing the control of the reactive power between the grid-type wind turbines and ensuring the stability of the offshore wind power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 1 is a flow chart of a reactive power control method based on a grid-type wind turbine generator system in one embodiment of the present invention;

[0050] Figure 2 It is a structural diagram of a reactive power control system based on a grid-type wind turbine generator system in one embodiment of the present invention;

[0051] Figure 3 It is a structural schematic diagram of a reactive power control device based on a grid-type wind turbine generator system in one embodiment of the present invention.

[0052] Reference numerals:

[0053] Among them, 11, acquisition module; 12, control module; 13, vector processing module; 14, determination module; 15, calculation module; 16, correction module; 17, transformation module; 18, execution module; 21, processor; 22, memory. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0055] In the description of the present invention, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0056] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are for illustrative purposes only, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In describing the present invention, it should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0058] With the continuous advancement of renewable energy technology, offshore wind power, as a clean and renewable form of energy, is gradually becoming an important part of energy.

[0059] In existing technologies, grid-connected wind turbines in offshore wind power transmission systems typically utilize a reactive power-frequency (Qf) droop control architecture. However, due to the inherent volatility and randomness of offshore wind power generation, when using Qf droop control, the reactive power of each wind turbine is always evenly distributed. This prevents wind turbines with low active power output from fully utilizing their reactive power regulation capabilities, thus affecting the stability of the offshore wind power transmission system.

[0060] It can be seen that how to control the reactive power between wind turbines of grid-type wind turbines to ensure the stability of offshore wind power transmission systems has become a technical problem that needs to be urgently solved by those skilled in the art.

[0061] To this end, an embodiment of the present invention provides a reactive power control method based on a grid-type wind turbine generator set. For details, see Figure 1 , Figure 1 The figure shows a flow chart of a reactive power control method based on a grid-type wind turbine generator system in one embodiment of the present invention, the method comprising:

[0062] S1: Obtain the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine;

[0063] S2: Processing the active power signal and the active power signal reference value by using proportional-integral control to obtain a reference value of the d-axis component of the AC voltage of the current wind turbine generator set;

[0064] S3: performing voltage-current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal;

[0065] S4: determining a reactive power deviation value based on the reactive power signal and the reactive power signal reference value;

[0066] S5: Inputting the reactive power deviation value into the constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal;

[0067] S6: using a preset reactive-phase angle feedforward coefficient to correct the angular frequency deviation signal after parameter calibration to obtain a phase angle signal;

[0068] S7: performing coordinate transformation processing on the first modulation signal and the second modulation signal using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set;

[0069] S8: Execute the reactive power control strategy generated by the reactive power modulation signal.

[0070] In step S1 , firstly, the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of each wind turbine in the current wind turbine group are obtained.

[0071] The active power signal and the active power signal reference value are processed using proportional-integral control to obtain a reference value of the AC voltage d-axis component of the current wind turbine generator set. This process specifically includes: obtaining an active power deviation based on the active power signal and the active power signal reference value; processing the proportional term and the integral term using an open-loop transfer function to obtain a proportional-integral controller; and inputting the active power deviation into the proportional-integral controller to obtain a reference value of the AC voltage d-axis component.

[0072] Specifically, the active power signal is the real-time measurement of the wind turbine's output active power. The active power signal reference value is based on the active power reference value given by the upper-level dispatch system, such as the wind turbine's maximum power tracking point. The active power deviation represents the difference between the current output and the target. This process quantifies the real-time deviation in active power, providing a basis for proportional-integral control.

[0073] The open-loop transfer function is used to process the proportional and integral terms. In the design of proportional-integral controller, the open-loop transfer function is the core tool for analyzing the dynamic characteristics of the system and parameter tuning. Its definition is directly related to the control object model and the controller structure.

[0074] In the proportional-integral controller designed using the open-loop transfer function, the proportional term can quickly respond to active power deviation and provide instantaneous regulation, while the integral term eliminates steady-state errors and ensures long-term tracking accuracy.

[0075] The active power deviation is input into the proportional-integral controller to obtain a reference value for the d-axis component of the AC voltage. This reference value ensures the accuracy and current sharing effect of the subsequent q-axis reactive power control.

[0076] In step S3, the reference value of the AC voltage d-axis component is subjected to voltage-current dual closed-loop vector processing to obtain a first modulation signal and a second modulation signal, specifically including: obtaining the AC voltage d-axis component, the AC voltage q-axis component and the AC voltage q-axis component reference value; performing voltage vector processing on the AC voltage d-axis component, the AC voltage q-axis component, the AC voltage q-axis component reference value and the reference value of the AC voltage d-axis component to obtain an AC current d-axis component reference value and an AC current q-axis component reference value; obtaining the AC current d-axis component and the AC current q-axis component; performing current vector processing on the AC current d-axis component, the AC current q-axis component, the AC current d-axis component reference value and the AC current q-axis component reference value to obtain the first modulation signal and the second modulation signal.

[0077] Preferably, the first modulation signal is a modulation signal of a d-axis component, and the second modulation signal is a modulation signal of a q-axis component.

[0078] Specifically, during the voltage vector processing process, the main function is to maintain the grid voltage stability and generate a current reference value. For example, when the grid voltage drops, the reference current is adjusted to indirectly control the active and reactive power and maintain the grid voltage amplitude and phase.

[0079] Specifically, during the current vector processing, the current reference value is quickly tracked to ensure that the actual current accurately follows the instruction. At the same time, the obtained modulation signal of the d-axis component and the modulation signal of the q-axis component can offset the coupling effect between the d-axis and q-axis components, thereby improving the control accuracy.

[0080] A reactive power deviation value is determined based on the reactive power signal and a reactive power signal reference value.

[0081] In step S5, the reactive power deviation value is input into the constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal, including: inputting the reactive power deviation value into the dynamic droop coefficient relationship constructed by the active power signal and the conventional droop coefficient to obtain the angular frequency deviation signal, wherein the angular frequency deviation signal is updated based on the real-time active power signal of the grid-type wind turbine.

[0082] Specifically, the reactive power deviation value is input into a dynamic droop coefficient relationship constructed from the active power signal and the conventional droop coefficient to generate an angular frequency deviation signal. During this process, the conventional droop coefficient is dynamically adjusted based on the wind turbine's real-time active power signal (i.e., the current actual active power output), generating an adaptive droop coefficient that varies with active power. For example, when the turbine's active power output is low, the droop coefficient is increased to increase its reactive power regulation weight; when the active power output is high, the droop coefficient is decreased to avoid turbine overload. This dynamic adjustment allows the droop coefficient to flexibly match the turbine's current operating status.

[0083] The calculated reactive power deviation (i.e., the difference between the target reactive power and the actual reactive power) is input into the dynamic droop coefficient equation to generate an angular frequency deviation signal. The magnitude of this signal is proportional to the reactive power deviation and the dynamic droop coefficient. For example, when a unit's reactive output is insufficient, a large reactive power deviation will be amplified by the current droop coefficient, generating a significant angular frequency deviation signal.

[0084] The core function of the angular frequency deviation signal is to drive the balanced distribution of reactive power among multiple wind turbines by adjusting the phase of the unit output voltage. Specifically, the angular frequency deviation signal will be converted into a phase angle offset through the integral link, changing the phase of the unit output voltage. When multiple units are operated in parallel, the phase difference will prompt each unit to automatically adjust its reactive output. The unit with the leading phase tends to reduce its reactive output, while the unit with the lagging phase increases its reactive output, ultimately achieving reactive current sharing among multiple units.

[0085] The introduction of real-time active power signals further optimizes the dynamic droop coefficient adjustment logic. Because wind turbines have limited apparent power capacity, their remaining reactive power regulation capacity inevitably decreases when their active power output is high. By dynamically adjusting the droop coefficient based on real-time active power, the system prioritizes the reactive power capacity of low-active-output units, preventing high-active-output units from triggering protective shutdowns due to reactive power overload, thereby improving overall system reliability.

[0086] In step S6, the angular frequency deviation signal after parameter calibration is corrected using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal, including: obtaining an angular frequency rated value; calibrating the angular frequency deviation signal and the angular frequency rated value to obtain an angular frequency reference value; and correcting the angular frequency reference value using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal.

[0087] The reference value of the angular frequency is read from the system settings as the reference for the calibration process. The real-time angular frequency deviation signal (the deviation between the actual frequency and the rated value) is combined with the angular frequency rated value to generate a dynamically adjusted angular frequency reference value through linear calibration or normalization.

[0088] Among them, the reactive-phase feedforward coefficient is set based on the system impedance. The preset reactive-phase feedforward coefficient is multiplied by the current reactive power change to generate a feedforward compensation amount, which directly corrects the angular frequency reference value. The corrected angular frequency reference value is converted into a phase angle signal through integration operation.

[0089] In this process, the dynamic changes of reactive power are directly converted into active adjustment of phase angle through reactive-phase feedforward compensation, which optimizes the voltage and frequency regulation performance of grid-connected wind turbines, especially in high-penetration new energy power grids, and significantly improves the transient stability of the system.

[0090] In step S7, the first modulation signal and the second modulation signal are subjected to coordinate transformation processing using the phase angle signal to obtain the reactive modulation signal of the current wind turbine generator set, including: normalizing the first modulation signal and the second modulation signal to obtain aligned first modulation signal and second modulation signal; and performing inverse Park transformation processing on the aligned first modulation signal and second modulation signal using the phase angle signal to obtain the reactive modulation signal of the current wind turbine generator set.

[0091] Specifically, the first modulation signal (d-axis modulation signal) and the second modulation signal (q-axis modulation signal) are amplitude-normalized to ensure that they are aligned under the same reference, thereby preventing amplitude exceeding a limit or distortion during subsequent transformation.

[0092] The normalized d-axis and q-axis modulation signals are inversely Park transformed using the phase angle signal to convert them from the rotating coordinate system (dq axes) to the stationary coordinate system. The orthogonal voltage components in the stationary coordinate system are extracted as the reactive modulation signal of the current wind turbine. The reactive power control strategy generated by the reactive modulation signal is used to control the reactive power output of the converter.

[0093] After executing the reactive power control strategy generated by the reactive modulation signal, the reactive power control method based on the grid-connected wind turbine generator system further includes:

[0094] Obtaining an execution result of the reactive power control strategy;

[0095] A threshold analysis is performed on each signal in the execution result, a fault fluctuation is determined according to a preset threshold, and a wind turbine group number corresponding to the fault fluctuation is sent to a maintenance terminal.

[0096] In the above method, the wind turbines of each grid-type wind turbine group can autonomously coordinate according to local measurement signals to achieve on-demand distribution and dynamic balance of reactive power.

[0097] At the same time, since the initial data of each wind turbine is different, the subsequent execution strategy of each wind turbine is different.

[0098] An embodiment of the present invention provides a reactive power control system based on a grid-type wind turbine generator system. For details, see Figure 2 , Figure 2 FIG. 1 is a schematic structural diagram of a reactive power control system based on a grid-connected wind turbine generator system in one embodiment of the present invention. The system includes:

[0099] An acquisition module 11 is configured to acquire a reactive power signal, a reactive power signal reference value, an active power signal, and an active power signal reference value of a current wind turbine generator system;

[0100] A control module 12 is configured to process the active power signal and the active power signal reference value using proportional-integral control to obtain a reference value of the AC voltage d-axis component of the current wind turbine generator set;

[0101] A vector processing module 13 is configured to perform voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal;

[0102] a determination module 14, configured to determine a reactive power deviation value based on the reactive power signal and the reactive power signal reference value;

[0103] A calculation module 15 is configured to input the reactive power deviation value into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal;

[0104] The correction module 16 is used to correct the angular frequency deviation signal after parameter calibration using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal;

[0105] a transformation module 17, configured to perform coordinate transformation processing on the first modulation signal and the second modulation signal using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set;

[0106] The execution module 18 is configured to execute the reactive power control strategy generated by the reactive power modulation signal.

[0107] See also Figure 3 , which is a structural diagram of a reactive power control device based on a grid-type wind turbine generator set provided in an embodiment of the present invention. The reactive power control device 20 based on a grid-type wind turbine generator set provided in an embodiment of the present invention comprises a processor 21, a memory 22, and a computer program stored in the memory 22 and configured to be executed by the processor 21. When the processor 21 executes the computer program, the steps in the embodiment of the reactive power control method based on a grid-type wind turbine generator set are implemented, for example Figure 1or, when the processor 21 executes the computer program, the functions of the modules in the above-mentioned device embodiments are realized, such as the acquisition module 11.

[0108] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory 22 and executed by the processor 21 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the reactive power control device 20 based on the grid-type wind turbine. For example, the computer program may be divided into an acquisition module 11, a control module 12, a vector processing module 13, etc., and the specific functions of each module are as follows:

[0109] An acquisition module 11 is configured to acquire a reactive power signal, a reactive power signal reference value, an active power signal, and an active power signal reference value of a current wind turbine generator system;

[0110] A control module 12 is configured to process the active power signal and the active power signal reference value using proportional-integral control to obtain a reference value of the AC voltage d-axis component of the current wind turbine generator set;

[0111] A vector processing module 13 is configured to perform voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal;

[0112] a determination module 14, configured to determine a reactive power deviation value based on the reactive power signal and the reactive power signal reference value;

[0113] A calculation module 15 is configured to input the reactive power deviation value into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal;

[0114] The correction module 16 is used to correct the angular frequency deviation signal after parameter calibration using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal;

[0115] a transformation module 17, configured to perform coordinate transformation processing on the first modulation signal and the second modulation signal using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set;

[0116] The execution module 18 is configured to execute the reactive power control strategy generated by the reactive power modulation signal.

[0117] The reactive power control device 20 based on the grid-type wind turbine generator system may include, but is not limited to, a processor 21 and a memory 22. Those skilled in the art will appreciate that the schematic diagram is merely an example of a reactive power control device based on a grid-type wind turbine generator system and does not limit the reactive power control device 20 based on the grid-type wind turbine generator system. The reactive power control device 20 based on the grid-type wind turbine generator system may include more or fewer components than shown in the figure, or may combine certain components, or different components. For example, the reactive power control device 20 based on the grid-type wind turbine generator system may further include input and output devices, network access devices, buses, and the like.

[0118] The processor 21 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 gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 21 is the control center of the reactive power control device 20 based on the grid-type wind turbine generator system, and utilizes various interfaces and lines to connect various parts of the reactive power control device 20 based on the grid-type wind turbine generator system.

[0119] The memory 22 can be used to store the computer programs and / or modules. The processor 21 implements the various functions of the reactive power control device 20 for a grid-connected wind turbine by running or executing the computer programs and / or modules stored in the memory 22 and accessing the data stored in the memory 22. The memory 22 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as a sound playback function or an image playback function); the data storage area may store data generated based on the use of the mobile phone (such as audio data and a phone book). Furthermore, the memory 22 may include high-speed random access memory (RAM) and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0120] If the integrated module of the reactive power control device 20 based on the grid-type wind turbine is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention can also implement all or part of the process of the above-mentioned method embodiment by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium.

[0121] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0122] Accordingly, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to perform the steps of the reactive power control method based on the grid-type wind turbine generator system in the above embodiment, for example Figure 1 Steps S1 to S8 described in .

[0123] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0124] The present invention obtains the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine generator set; uses proportional-integral control to process the active power signal and the active power signal reference value to obtain the reference value of the AC voltage d-axis component of the current wind turbine generator set; performs voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal; determines a reactive power deviation value based on the reactive power signal and the reactive power signal reference value; inputs the reactive power deviation value into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal; uses a preset reactive-phase angle feedforward coefficient to correct the parameter-calibrated angular frequency deviation signal to obtain a phase angle signal; uses the phase angle signal to perform coordinate transformation processing on the first modulation signal and the second modulation signal to obtain the reactive modulation signal of the current wind turbine generator set; and executes a reactive power control strategy generated by the reactive modulation signal.

[0125] Compared with the existing technology, the present invention processes active power deviation through a proportional-integral controller, dynamically adjusts the reference value of the AC voltage d-axis component, stabilizes the DC bus or AC voltage level, provides a balanced voltage basis for reactive power distribution, performs current inner loop and voltage outer loop control based on at least the d-axis voltage reference value, quickly tracks instructions and decouples and adjusts the first modulation signal and the second modulation signal, ensures voltage stability in the dynamic process, and reduces cross-interference between active and reactive power; then compares the deviation between the actual reactive power and the reference value, quantifies the gap between the current reactive power output and the target, and drives subsequent dynamic droop control , the reactive deviation is input into the adaptive droop coefficient relationship to generate an angular frequency deviation signal. When the deviation is high, the droop coefficient is increased to encourage low-output wind turbines to bear more reactive power; the preset feedforward coefficient is used to perform phase compensation on the angular frequency deviation to offset the phase shift caused by reactive regulation; the d-axis and q-axis modulation signals are converted into components in the stationary coordinate system through inverse Park transform to generate a reactive modulation signal, and the generated reactive modulation signal is applied to the converter to dynamically balance the reactive power of each wind turbine, thereby realizing the control of the reactive power between the grid-type wind turbines and ensuring the stability of the offshore wind power transmission system.

[0126] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A reactive power control method based on a grid-type wind turbine generator system, characterized in that: include: Obtain the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine; Processing the active power signal and the active power signal reference value by using proportional-integral control to obtain a reference value of the AC voltage d-axis component of the current wind turbine generator set; Performing voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal; determining a reactive power deviation value based on the reactive power signal and the reactive power signal reference value; Inputting the reactive power deviation value into a constructed dynamic droop coefficient relationship equation to obtain an angular frequency deviation signal includes: inputting the reactive power deviation value into a dynamic droop coefficient relationship equation constructed by the active power signal and a conventional droop coefficient to obtain the angular frequency deviation signal, wherein the angular frequency deviation signal is updated based on the real-time active power signal of the grid-type wind turbine; The angular frequency deviation signal after parameter calibration is corrected using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal; performing coordinate transformation processing on the first modulation signal and the second modulation signal by using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set; A reactive power control strategy generated by the reactive modulation signal is executed.

2. The reactive power control method based on a grid-connected wind turbine generator system according to claim 1, characterized in that: The process of processing the active power signal and the active power signal reference value by using proportional-integral control to obtain the reference value of the AC voltage d-axis component of the current wind turbine generator system includes: Obtaining an active power deviation based on the active power signal and the active power signal reference value; The proportional-integral controller is obtained by processing the proportional and integral terms using the open-loop transfer function. The active power deviation is input into the proportional-integral controller to obtain a reference value of the d-axis component of the AC voltage.

3. The reactive power control method based on a grid-connected wind turbine generator system according to claim 1, characterized in that: The step of performing voltage-current dual closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal includes: Obtaining an AC voltage d-axis component, an AC voltage q-axis component, and an AC voltage q-axis component reference value; performing voltage vector processing on the AC voltage d-axis component, the AC voltage q-axis component, the AC voltage q-axis component reference value, and the AC voltage d-axis component reference value to obtain an AC current d-axis component reference value and an AC current q-axis component reference value; Obtaining the d-axis component of the alternating current and the q-axis component of the alternating current; Current vector processing is performed on the AC current d-axis component, the AC current q-axis component, the AC current d-axis component reference value, and the AC current q-axis component reference value to obtain the first modulation signal and the second modulation signal.

4. The reactive power control method based on a grid-connected wind turbine generator system according to claim 1, characterized in that: The method of using a preset reactive-phase angle feedforward coefficient to correct the angular frequency deviation signal after parameter calibration to obtain a phase angle signal includes: Get the angular frequency rating; Calibrate the angular frequency deviation signal and the angular frequency rated value to obtain an angular frequency reference value; The angular frequency reference value is corrected using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal.

5. The reactive power control method based on a grid-connected wind turbine generator system according to claim 1, characterized in that: The performing coordinate transformation processing on the first modulation signal and the second modulation signal by using the phase angle signal to obtain the reactive modulation signal of the current wind turbine generator system includes: performing normalization processing on the first modulated signal and the second modulated signal to obtain aligned first modulated signal and second modulated signal; The phase angle signal is used to perform inverse Park transform processing on the aligned first modulation signal and the second modulation signal to obtain a reactive modulation signal of the current wind turbine generator set.

6. The reactive power control method based on a grid-connected wind turbine generator system according to claim 1, characterized in that: After executing the reactive power control strategy generated by the reactive modulation signal, the reactive power control method based on the grid-connected wind turbine generator system further includes: Obtaining an execution result of the reactive power control strategy; A threshold analysis is performed on each signal in the execution result, a fault fluctuation is determined according to a preset threshold, and a wind turbine group number corresponding to the fault fluctuation is sent to a maintenance terminal.

7. A reactive power control system based on a grid-type wind turbine generator system, characterized in that: include: An acquisition module is used to obtain the reactive power signal, reactive power signal reference value, active power signal and active power signal reference value of the current wind turbine; a control module, configured to process the active power signal and the active power signal reference value by using proportional-integral control to obtain a reference value of the d-axis component of the AC voltage of the current wind turbine generator set; A vector processing module, configured to perform voltage and current double closed-loop vector processing on the reference value of the AC voltage d-axis component to obtain a first modulation signal and a second modulation signal; a determining module, configured to determine a reactive power deviation value based on the reactive power signal and the reactive power signal reference value; a calculation module, configured to input the reactive power deviation value into a constructed dynamic droop coefficient relationship to obtain an angular frequency deviation signal; A correction module is used to correct the angular frequency deviation signal after parameter calibration using a preset reactive-phase angle feedforward coefficient to obtain a phase angle signal; a transformation module, configured to perform coordinate transformation processing on the first modulation signal and the second modulation signal using the phase angle signal to obtain a reactive modulation signal of the current wind turbine generator set; An execution module is used to execute the reactive power control strategy generated by the reactive power modulation signal.

8. A reactive power control device based on a grid-type wind turbine generator system, characterized in that: It comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the reactive power control method based on the grid-type wind turbine according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the reactive power control method based on the grid-type wind turbine according to any one of claims 1 to 6 is implemented.

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