Network-constructing type wind turbine control method and device based on distributed energy storage, equipment and medium

Abstract

This invention discloses a control method, device, equipment, and medium for grid-connected wind turbines based on distributed energy storage, belonging to the field of wind power generation. Specifically, it involves: calculating a reference power based on real-time wind speed and the target tip speed ratio of the permanent magnet synchronous wind turbine; generating a first control signal based on the difference between the real-time power and the reference power; comparing the real-time DC voltage of each back-to-back converter with a preset reference value, and generating corresponding second control signals based on the comparison results; performing virtual synchronous control calculations based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter; inputting the calculated reference quantities into a voltage and current control loop containing virtual impedance for adjustment, and generating corresponding third control signals; and controlling the grid-connected wind turbine through the first, second, and third control signals. Therefore, by implementing this invention, the wind energy utilization rate and grid connection stability of grid-connected wind turbines can be improved.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to a method, apparatus, equipment and medium for controlling grid-type wind turbines based on distributed energy storage. Background Technology

[0002] As wind power accounts for an increasingly larger share of the power system, the problems of voltage instability and insufficient inertia of traditional grid-connected wind turbines under weak grid conditions are becoming increasingly prominent, prompting grid-connected control technology to become a research hotspot. Grid-connected wind turbines, by simulating the voltage source characteristics of synchronous generators, can autonomously establish voltage and frequency, providing inertial response and frequency support for the power grid.

[0003] However, existing grid-type wind turbine technology faces multiple bottlenecks when developing towards larger capacities: on the one hand, in order to provide frequency regulation reserve capacity, wind turbines usually need to operate at reduced load, resulting in wind curtailment and reducing wind energy utilization and power generation economy; on the other hand, when multiple sets of back-to-back converters are connected in parallel to improve current carrying capacity, the low-frequency oscillation and circulating current problems between grid-type converters seriously threaten system stability, and existing methods lack effective solutions to this problem.

[0004] To address the aforementioned issues, existing research has attempted to optimize the performance of grid-connected wind turbines by improving control strategies, but these methods generally have limitations. Some methods achieve grid-machine coordination through adaptive load shedding, but rely on rotor kinetic energy as the frequency regulation energy source, resulting in limited frequency regulation capability and a tendency to induce secondary frequency drops. Other methods improve grid-connected stability by adjusting the inertial time constant, but these are only applicable to small-capacity units with a single converter and cannot solve the power oscillation problem when multiple units are connected in parallel. Furthermore, existing schemes suffer from a conflict in control degrees of freedom between grid-side virtual synchronization control and turbine-side maximum power point tracking, preventing wind turbines from simultaneously achieving active grid support under full power generation. Summary of the Invention

[0005] This invention provides a control method, device, equipment, and medium for grid-connected wind turbines based on distributed energy storage, which can improve the wind energy utilization rate and grid connection stability of grid-connected wind turbines.

[0006] This invention provides a grid-type wind turbine control method based on distributed energy storage, applicable to grid-type wind turbine systems. The grid-type wind turbine system includes a permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters, and two sets of energy storage batteries; wherein, the back-to-back converters include a turbine-side converter and a grid-side converter. The grid-type wind turbine control method includes: The system acquires the real-time wind speed and the real-time power and target tip speed ratio of the permanent magnet synchronous fan, calculates the reference power based on the real-time wind speed and the target tip speed ratio, and generates a first control signal based on the difference between the real-time power and the reference power. The real-time DC voltage of each of the back-to-back converters is collected, and each of the real-time DC voltages is compared with a preset reference value. A corresponding second control signal is generated based on the comparison results. Virtual synchronous control calculations are performed based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter. The calculated reference quantities are then input to the voltage and current control loop for adjustment, generating the corresponding third control signal. The voltage and current control loop includes a virtual impedance. The first control signal, the second control signal, and the third control signal are respectively input to the turbine-side converter, the energy storage battery, and the grid-side converter to control the grid-type wind turbine system.

[0007] This invention provides a signal basis for grid-connected wind turbine control to ensure the turbine always operates at its maximum power point by acquiring real-time wind speed and real-time power, calculating a reference power based on the target tip speed ratio, and comparing it with the real-time power. A second control signal is generated by acquiring the real-time DC voltage of each back-to-back converter and comparing it with a preset reference value, providing a signal basis for grid-connected wind turbine control to maintain a stable DC bus voltage. A third control signal is generated by performing virtual synchronous control based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter and inputting the reference quantity into a voltage and current control loop containing virtual impedance, providing a signal basis for grid-connected wind turbine control to enable the grid-side converter to actively support the grid and suppress power oscillations. By inputting the three control signals to the turbine-side converter, energy storage battery, and grid-side converter respectively, coordinated control of the turbine-side converter, energy storage battery, and grid-side converter can be achieved, enabling the wind turbine to simultaneously support the grid under full-load conditions. Compared to existing technologies that are prone to wind curtailment and frequency drops, this application can improve the wind energy utilization rate and grid connection stability of grid-connected wind turbines.

[0008] Furthermore, the grid-type wind turbine system includes a permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters, and two sets of energy storage batteries, specifically: The output end of the permanent magnet synchronous fan is connected to the AC side of each of the machine-side converters; Each of the machine-side converters has its DC side connected to the DC side of the corresponding grid-side converter via a DC bus; wherein, a set of back-to-back converters corresponds to one DC bus. The AC side of each grid-side converter is connected to the power grid; Each of the energy storage batteries is connected to the corresponding DC bus via a Buck / Boost half-bridge circuit; wherein, a set of back-to-back converters corresponds to a set of energy storage batteries, and a set of energy storage batteries corresponds to a Buck / Boost half-bridge circuit.

[0009] The embodiments of the present invention, by defining the connection relationship between the permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters and two sets of energy storage batteries, can provide a hardware foundation for a grid-type wind turbine control method based on distributed energy storage.

[0010] Further, the step of calculating the reference power based on the real-time wind speed and the target tip speed ratio, and generating a first control signal based on the difference between the real-time power and the reference power, includes: The target rotational speed is calculated based on the real-time wind speed and the target tip speed ratio, and the reference power is calculated based on the target rotational speed. The difference between the real-time power and the reference power is input to the proportional-integral controller to generate a first control signal.

[0011] This invention calculates the target rotational speed based on real-time wind speed and target tip speed ratio, and calculates the reference power based on the target rotational speed. Then, the difference between the real-time power and the reference power is used to generate a first control signal through proportional-integral adjustment. This enables closed-loop tracking of the fan speed to the optimal rotational speed, ensuring that the fan always outputs maximum power.

[0012] Further, the step of comparing each of the real-time DC voltages with a preset reference value and generating a corresponding second control signal based on each comparison result includes: Each of the real-time DC voltages is compared with a preset reference value, and the comparison results are input to the proportional-integral controller to generate the corresponding second control signal.

[0013] In this embodiment of the invention, by inputting the comparison results of each real-time DC voltage with a preset reference value into a proportional-integral regulator to generate a corresponding second control signal, independent closed-loop control of each DC bus voltage can be achieved, so that each DC bus voltage is stabilized at a preset value.

[0014] Furthermore, the virtual synchronous control calculation is performed based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter, and the calculated reference quantities are input to the voltage and current control loop for adjustment to generate corresponding third control signals, including: The real-time active power, the preset active power reference value, and the virtual synchro speed are input into the virtual synchro loop for calculation to generate a reference phase; The real-time output voltage, the preset output voltage reference value, the real-time reactive power, and the preset reactive power reference value are input into the reactive power loop for calculation to generate a reference voltage. The reference phase and the reference voltage are input to the voltage and current control loop for adjustment, thereby generating a third control signal.

[0015] The embodiments of the present invention generate a reference phase by inputting real-time active power, a preset active power reference value, and virtual synchronous machine speed into a virtual synchronous loop, and generate a reference voltage by inputting real-time output voltage, a preset output voltage reference value, real-time reactive power, and a preset reactive power reference value into a reactive power loop. This can simulate the characteristics of a synchronous generator, enabling the grid-side converter to have inertial response and grid support capabilities.

[0016] Further, the step of inputting the reference phase and the reference voltage to the voltage-current control loop for adjustment to generate a third control signal includes: The reference phase and the reference voltage are input to the voltage-current control loop to generate a modulated wave; The modulated wave is subjected to sinusoidal pulse width modulation to generate a third control signal.

[0017] This invention generates a modulation wave by using a reference phase and reference voltage input voltage-current control loop, and then performs sinusoidal pulse width modulation on the modulation wave to generate a third control signal. This enables the conversion of voltage amplitude and phase commands into switching signals that drive the grid-side converter, thereby achieving the output of the desired voltage waveform.

[0018] Further, the step of inputting the first control signal, the second control signal, and the third control signal to the turbine-side converter, the energy storage battery, and the grid-side converter, respectively, to control the grid-type wind turbine system, includes: The first control signal is input to each of the machine-side converters, so that each of the machine-side converters adjusts the torque of the permanent magnet synchronous wind turbine according to the first control signal; Each of the second control signals is input to the corresponding Buck / Boost half-bridge circuit, so that each of the Buck / Boost half-bridge circuits adjusts the working mode of the corresponding energy storage battery according to the corresponding second control signal. Each of the third control signals is input to the corresponding grid-side converter so that each grid-side converter adjusts its output according to the corresponding third control signal.

[0019] In this embodiment of the invention, by inputting a first control signal to the turbine-side converter to adjust the turbine torque, inputting a second control signal to the Buck / Boost half-bridge circuit to adjust the energy storage battery operating mode, and inputting a third control signal to the grid-side converter for output adjustment, the three sets of control signals can be used to precisely drive their respective actuators, thereby achieving coordinated control of the grid-type wind turbine system.

[0020] Another embodiment of the present invention provides a grid-type wind turbine control device based on distributed energy storage, which is applicable to grid-type wind turbine systems. The grid-type wind turbine system includes a permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters, and two sets of energy storage batteries; wherein, the back-to-back converters include a turbine-side converter and a grid-side converter. The grid-type wind turbine control device includes: a first control signal generation module, a second control signal generation module, a third control signal generation module, and a system control module; The first control signal generation module is used to acquire the real-time wind speed and the real-time power and target tip speed ratio of the permanent magnet synchronous wind turbine, calculate the reference power based on the real-time wind speed and the target tip speed ratio, and generate a first control signal based on the difference between the real-time power and the reference power. The second control signal generation module is used to collect the real-time DC voltage of each of the back-to-back converters, compare each of the real-time DC voltages with a preset reference value, and generate a corresponding second control signal based on the comparison results. The third control signal generation module is used to perform virtual synchronous control calculations based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter, and input the calculated reference quantities to the voltage and current control loop for adjustment to generate the corresponding third control signal; wherein, the voltage and current control loop includes virtual impedance; The system control module is used to input the first control signal, the second control signal and the third control signal to the turbine-side converter, the energy storage battery and the grid-side converter respectively, so as to realize the control of the grid-type wind turbine system.

[0021] Another embodiment of the present invention provides a terminal device, including: 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 steps of a grid-type wind turbine control method based on distributed energy storage as described in the present invention.

[0022] Another embodiment of the present invention also provides a computer-readable storage medium item, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of a grid-type wind turbine control method based on distributed energy storage as described in the present invention. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating an embodiment of the grid-type wind turbine control method based on distributed energy storage provided by the present invention. Figure 2 A schematic diagram of a structure of an embodiment of the grid-type wind turbine system provided by the present invention; Figure 3 This is a schematic flowchart of an embodiment of the voltage and current control loop control method for Buck / Boost half-bridge circuits provided by the present invention. Figure 4 A flowchart illustrating an embodiment of the virtual synchronization control method provided by the present invention; Figure 5 A schematic flowchart of an embodiment of the voltage-current control loop control method with additional virtual impedance provided by the present invention; Figure 6 This is a schematic diagram of one embodiment of the grid-type wind turbine control device based on distributed energy storage provided by the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] See Figure 1 To address the issues of wind curtailment and frequency drop that are common in existing technologies, an embodiment of the present invention provides a grid-type wind turbine control method based on distributed energy storage, applicable to grid-type wind turbine systems. The grid-type wind turbine system includes a permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters, and two sets of energy storage batteries; wherein the back-to-back converters include a turbine-side converter and a grid-side converter.

[0031] In this embodiment of the invention, the topology of the grid-type wind turbine system is as follows: Figure 2 As shown, the specific connection relationship is as follows: the output end of the permanent magnet synchronous wind turbine is connected to the AC side of each of the turbine-side converters; the DC side of each of the turbine-side converters is connected to the DC side of the corresponding grid-side converter through a DC bus; wherein, a set of back-to-back converters corresponds to one DC bus; the AC side of each of the grid-side converters is connected to the power grid; each of the energy storage batteries is connected to the corresponding DC bus through a Buck / Boost half-bridge circuit; wherein, a set of back-to-back converters corresponds to a set of energy storage batteries, and a set of energy storage batteries corresponds to one Buck / Boost half-bridge circuit.

[0032] In this embodiment of the invention, the grid-type wind turbine control method based on distributed energy storage includes steps S101 to S104: Step S101: Obtain the real-time wind speed and the real-time power and target tip speed ratio of the permanent magnet synchronous fan; calculate the reference power based on the real-time wind speed and the target tip speed ratio; and generate a first control signal based on the difference between the real-time power and the reference power.

[0033] It should be noted that acquiring the real-time wind speed, the real-time power of the permanent magnet synchronous wind turbine, and the target tip speed ratio, calculating the reference power based on the real-time wind speed and the target tip speed ratio, and generating the first control signal based on the difference between the real-time power and the reference power means: First, acquiring the real-time wind speed, the real-time power of the permanent magnet synchronous wind turbine, and the target tip speed ratio. The real-time wind speed is used to determine the current wind resource status, and the target tip speed ratio is the optimal tip speed ratio constant determined by the design of the permanent magnet synchronous wind turbine blades. Based on the real-time wind speed and the target tip speed ratio, the target rotational speed of the permanent magnet synchronous wind turbine at the current wind speed is calculated, and then the corresponding reference power is calculated based on the target rotational speed. This reference power is the theoretically maximum power that the permanent magnet synchronous wind turbine can output at the current wind speed. Then, the acquired real-time power of the permanent magnet synchronous wind turbine is compared with the calculated reference power, the difference between the two is calculated, and this difference is input into the proportional-integral controller (PIC). After proportional-integral operation, the first control signal is generated. The first control signal is used to drive the machine-side converter to adjust the electromagnetic torque of the permanent magnet synchronous fan, so that the actual speed of the permanent magnet synchronous fan tracks the target speed in real time, thereby making the permanent magnet synchronous fan always run at the maximum power point corresponding to the optimal tip speed ratio, and realizing maximum power tracking control.

[0034] Preferably, the step of calculating the reference power based on the real-time wind speed and the target tip speed ratio, and generating a first control signal based on the difference between the real-time power and the reference power, includes: The target rotational speed is calculated based on the real-time wind speed and the target tip speed ratio, and the reference power is calculated based on the target rotational speed. The difference between the real-time power and the reference power is input to the proportional-integral controller to generate a first control signal.

[0035] In one embodiment, the AC side of the turbine-side converter is directly connected to the output terminal of the permanent magnet synchronous wind turbine. Indirect torque control is used to achieve maximum power point tracking of the permanent magnet synchronous wind turbine, thus ensuring the wind energy utilization coefficient of the permanent magnet synchronous wind turbine at any permissible wind speed. Maximum output power. Considering fan losses, the kinetic energy theorem is used to derive the fan's ability to capture wind energy. The specific calculation formula is as follows: ; in, air density; The area swept by the blades of a permanent magnet synchronous fan. Real-time wind speed; wind energy utilization coefficient Tip speed ratio With pitch angle The function, specifically the expression is shown below: ; in, The radius of the blade of the permanent magnet synchronous fan; This refers to the rotational speed of the permanent magnet synchronous fan. , , , , and The wind energy utilization coefficient parameter is a fixed constant. These are intermediate calculation variables introduced to simplify the formula expression. The optimal tip speed ratio of a permanent magnet synchronous wind turbine can be obtained by plotting the wind energy capture function curve. (i.e., target tip speed ratio), and the optimal rotational speed (i.e., target rotational speed) corresponding to each wind speed. This ensures maximum wind energy utilization and maximum wind energy capture by the wind turbine. At this point, there is... Substituting the wind energy capture function into the equation, we can obtain the reference power expression for the permanent magnet synchronous wind turbine: ; The reference power obtained from the above formula The reference power of the turbine-side converter is calculated by subtracting it from the real-time power of the permanent magnet synchronous wind turbine, and then adjusted by a proportional-integral regulator to generate the first control signal. This first control signal is input to the voltage-current inner loop of the turbine-side converter for control, thereby achieving maximum power point tracking (MPPT) of the permanent magnet synchronous wind turbine.

[0036] Step S102: Collect the real-time DC voltage of each of the back-to-back converters, compare each of the real-time DC voltages with a preset reference value, and generate a corresponding second control signal based on the comparison results.

[0037] It should be noted that acquiring the real-time DC voltage of each of the back-to-back converters, comparing each real-time DC voltage with a preset reference value, and generating a corresponding second control signal based on the comparison results means: real-time acquisition of the DC voltage on each DC bus, i.e., the DC-side voltage of each back-to-back converter. The acquired real-time DC voltage is compared with its corresponding preset reference voltage to obtain the voltage deviation of each DC bus. Each voltage deviation is input to a corresponding proportional-integral controller, and after proportional-integral calculation, a corresponding second control signal is generated. This second control signal is used to control the switching transistors of the Buck / Boost half-bridge circuit connected to the corresponding DC bus, so that the energy storage battery automatically charges or discharges according to the change in DC voltage: when the DC voltage is higher than the reference value, the energy storage battery charges to absorb excess power; when the DC voltage is lower than the reference value, the energy storage battery discharges to compensate for the power deficiency. Through the above closed-loop control, the voltage of each DC bus is stabilized in real time near the preset reference value, providing a stable DC energy source for the grid-side converter.

[0038] Preferably, each of the real-time DC voltages is compared with a preset reference value, and a corresponding second control signal is generated based on the comparison results, including: Each of the real-time DC voltages is compared with a preset reference value, and the comparison results are input to the proportional-integral controller to generate the corresponding second control signal.

[0039] In one embodiment, the Buck / Boost half-bridge circuit employs a voltage-current control loop, and the specific control flow is as follows: Figure 3 As shown; where, For reference DC voltage, This is the actual DC voltage. For reference inductor current, This represents the actual inductor current. When the output power of the permanent magnet synchronous wind turbine is less than the output power of the grid-side converter, the real-time DC voltage decreases and falls below the preset reference value. At this time, the voltage deviation is positive, the current loop reference value is positive, and the Buck / Boost half-bridge circuit operates in Boost mode, controlling the corresponding energy storage battery to generate power, providing an additional power source, increasing the DC voltage, and stabilizing it at the preset reference value. When the output power of the permanent magnet synchronous wind turbine is greater than the output power of the grid-side converter, the real-time DC voltage increases and exceeds the preset reference value. At this time, the voltage deviation is negative, the current loop reference value is negative, and the Buck / Boost half-bridge circuit operates in Buck mode, controlling the corresponding energy storage battery to absorb power, acting as an additional load, decreasing the DC voltage, and stabilizing it at the preset reference value.

[0040] Step S103: Based on the real-time active power, real-time reactive power and real-time output voltage of each grid-side converter, perform virtual synchronous control calculation, and input the calculated reference quantities to the voltage and current control loop for adjustment to generate the corresponding third control signal; wherein, the voltage and current control loop includes virtual impedance.

[0041] It should be noted that the virtual synchronous control calculation based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter, and the input of the calculated reference quantities to the voltage and current control loop for adjustment to generate the corresponding third control signal, refers to the following: First, the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter are calculated. The real-time active power is compared with a preset active power reference value, and the difference, along with the virtual synchronous machine speed deviation, is input to the virtual synchronous loop to simulate the swing equation of the synchronous generator and calculate the reference phase of each grid-side converter. Simultaneously, the real-time reactive power is compared with a preset reactive power reference value, and the difference, combined with the real-time output voltage, is fed back to the reactive power loop. Through droop control or proportional-integral regulation, the reference voltage of each grid-side converter is calculated. The calculated reference phase and reference voltage are used as commands and input to the voltage and current control loop with added virtual impedance. The voltage and current control loop generates a modulation wave through closed-loop adjustment of the voltage outer loop and the current inner loop, and then generates the corresponding third control signal through sinusoidal pulse width modulation. The third control signal is used to drive the power switches of the grid-side converter, enabling the grid-side converter to output AC voltage and current that conform to the command, thereby simulating the voltage source characteristics of a synchronous generator and providing inertial response, primary frequency regulation, and voltage support for the power grid. The virtual impedance is added to the outer voltage loop to increase the equivalent output impedance between the grid-side converters, suppress circulating currents and low-frequency oscillations, and achieve stable parallel operation of multiple grid-side converters.

[0042] Preferably, the virtual synchronous control calculation is performed based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter, and the calculated reference quantities are input to the voltage and current control loop for adjustment to generate corresponding third control signals, including: The real-time active power, the preset active power reference value, and the virtual synchro speed are input into the virtual synchro loop for calculation to generate a reference phase; The real-time output voltage, the preset output voltage reference value, the real-time reactive power, and the preset reactive power reference value are input into the reactive power loop for calculation to generate a reference voltage. The reference phase and the reference voltage are input to the voltage and current control loop for adjustment, thereby generating a third control signal.

[0043] Preferably, the step of inputting the reference phase and the reference voltage to the voltage-current control loop for adjustment to generate a third control signal includes: The reference phase and the reference voltage are input to the voltage-current control loop to generate a modulated wave; The modulated wave is subjected to sinusoidal pulse width modulation to generate a third control signal.

[0044] In one embodiment, virtual synchronous control is applied to the grid-side converter. The output phase is autonomously generated by simulating the swing equation of a synchronous generator, maximally simulating the characteristics of a synchronous generator. Its mathematical model is consistent with the swing equation of a synchronous generator, as shown below: ; in, This is the virtual inertial time constant; This refers to the output power of the permanent magnet synchronous fan. This represents the real-time active power of the grid-side converter. The damping coefficient; This is the difference between the virtual synchronizer speed and the reference speed; This refers to the rotor phase of the synchronous machine; The speed is the virtual synchronous machine speed. This mathematical model contains a damping term; grid-side converters using this control can provide both frequency support for the grid and equivalent inertia for the system.

[0045] In one embodiment, the control flow of virtual synchronization control is as follows: Figure 4 As shown; where, For reference active power, For reference output voltage, For reference reactive power, This represents the actual active power. This is the actual output voltage. This represents the actual reactive power. For the virtual synchronizer speed, The damping coefficient is... For virtual inertia, For the Laplace operator, This is the reactive power droop factor. The reactive power integral coefficient, For the rotor phase of the synchronous machine, for Shaft reference voltage, for Actual shaft voltage for Actual shaft voltage for Actual shaft current, for The actual shaft current. The outer control loop consists of a virtual synchronization loop and a reactive power loop, while the inner control loop consists of a voltage and current control loop. After the inner control loop outputs a modulated wave, it is then sinusoidally pulse-width modulated to output a third control signal. The virtual synchronization loop's inputs are real-time active power, a preset active power reference value, and the virtual synchronizer speed; its output is the reference phase. The reactive power loop's inputs are real-time output voltage, a preset output voltage reference value, real-time reactive power, and a preset reactive power reference value; its output is the reference voltage.

[0046] Furthermore, the reference phase and reference voltage are input to the voltage-current control loop for control. At this point, the grid-side converter is equivalent to a series-connected, low-impedance controlled voltage source. Direct parallel connection of two grid-side converters would cause power oscillations due to the small interconnection impedance. Therefore, a virtual impedance control can be added to the voltage control loop to improve system stability. The control flow of the voltage-current control loop with added virtual impedance is as follows: Figure 5 As shown; where, For the additional virtual impedance, for Shaft reference voltage, for Shaft reference voltage, for Actual shaft current (feedback value). for Actual shaft current (feedback value). for Actual shaft voltage for Actual shaft voltage For the virtual synchronizer speed, For filtering capacitors, for Actual shaft current (measured value). for Actual shaft current (measured value). for Shaft reference current, for Shaft reference current, This is the filter inductor. At this point, the output impedance between the two parallel grid-side converters will increase to 2. It can suppress circulation and improve operational stability.

[0047] Step S104: The first control signal, the second control signal, and the third control signal are respectively input to the turbine-side converter, the energy storage battery, and the grid-side converter to control the grid-type wind turbine system.

[0048] It should be noted that inputting the first, second, and third control signals to the turbine-side converter, the energy storage battery, and the grid-side converter, respectively, to control the grid-connected wind turbine system means: The first control signal is input to the turbine-side converter to adjust the electromagnetic torque of the permanent magnet synchronous wind turbine, ensuring the turbine speed tracks the optimal speed in real time, thus achieving maximum power point tracking (MPPT). The second control signals are input to their respective energy storage batteries to control their charging and discharging states, stabilizing the voltage of their respective DC buses. The third control signals are input to their respective grid-side converters to drive their power switches, causing them to output AC voltage and current conforming to commands, achieving virtual synchronous machine control. Through the coordinated input of these three control signals, the turbine-side converter, energy storage battery, and grid-side converter each operate according to preset control targets, jointly achieving maximum power point tracking, DC bus voltage stability, and grid frequency and voltage support for the grid-connected wind turbine system.

[0049] Preferably, the step of inputting the first control signal, the second control signal, and the third control signal to the turbine-side converter, the energy storage battery, and the grid-side converter, respectively, to control the grid-type wind turbine system includes: The first control signal is input to each of the machine-side converters, so that each of the machine-side converters adjusts the torque of the permanent magnet synchronous wind turbine according to the first control signal; Each of the second control signals is input to the corresponding Buck / Boost half-bridge circuit, so that each of the Buck / Boost half-bridge circuits adjusts the working mode of the corresponding energy storage battery according to the corresponding second control signal. Each of the third control signals is input to the corresponding grid-side converter so that each grid-side converter adjusts its output according to the corresponding third control signal.

[0050] In one embodiment, the generated first control signal is input to the voltage and current inner loop controller of each generator-side converter. After being regulated by the voltage and current inner loop controller, the first control signal generates a PWM switching signal to drive the power switching transistors of the generator-side converter, adjusting the electromagnetic torque of the permanent magnet synchronous wind turbine, so that the wind turbine speed tracks the optimal speed under the current wind speed in real time, achieving maximum power point tracking control. The generated second control signals are input to the switching transistor drive circuits of the corresponding Buck / Boost half-bridge circuits. After being amplified by the drive circuits, the second control signals control the on and off states of the switching transistors in the corresponding Buck / Boost half-bridge circuits, thereby adjusting the charging or discharging state of the corresponding energy storage batteries, stabilizing the voltage of each DC bus at its respective preset reference value. The generated third control signals are input to the switching transistor drive circuits of the corresponding grid-side converters. Each third control signal is a PWM pulse signal, which is amplified by the drive circuit to control the on and off of the power switching transistors in the corresponding grid-side converter, so that each grid-side converter outputs AC voltage and current that conform to the reference phase and reference voltage commands, realizing virtual synchronous machine control and providing inertial response, primary frequency regulation and voltage support for the power grid.

[0051] This invention provides a signal basis for grid-connected wind turbine control to ensure the turbine always operates at its maximum power point by acquiring real-time wind speed and real-time power, calculating a reference power based on the target tip speed ratio, and comparing it with the real-time power. A second control signal is generated by acquiring the real-time DC voltage of each back-to-back converter and comparing it with a preset reference value, providing a signal basis for grid-connected wind turbine control to maintain a stable DC bus voltage. A third control signal is generated by performing virtual synchronous control based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter and inputting the reference quantity into a voltage and current control loop containing virtual impedance, providing a signal basis for grid-connected wind turbine control to enable the grid-side converter to actively support the grid and suppress power oscillations. By inputting the three control signals to the turbine-side converter, energy storage battery, and grid-side converter respectively, coordinated control of the turbine-side converter, energy storage battery, and grid-side converter can be achieved, enabling the wind turbine to simultaneously support the grid under full-load conditions. Compared to existing technologies that are prone to wind curtailment and frequency drops, this application can improve the wind energy utilization rate and grid connection stability of grid-connected wind turbines.

[0052] Optionally, in this embodiment of the invention, the grid-type wind turbine system includes a permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters, and two sets of energy storage batteries, specifically: The output end of the permanent magnet synchronous fan is connected to the AC side of each of the machine-side converters; Each of the machine-side converters has its DC side connected to the DC side of the corresponding grid-side converter via a DC bus; wherein, a set of back-to-back converters corresponds to one DC bus. The AC side of each grid-side converter is connected to the power grid; Each of the energy storage batteries is connected to the corresponding DC bus via a Buck / Boost half-bridge circuit; wherein, a set of back-to-back converters corresponds to a set of energy storage batteries, and a set of energy storage batteries corresponds to a Buck / Boost half-bridge circuit.

[0053] The embodiments of the present invention, by defining the connection relationship between the permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters and two sets of energy storage batteries, can provide a hardware foundation for a grid-type wind turbine control method based on distributed energy storage.

[0054] Optionally, in this embodiment of the invention, the step of calculating the reference power based on the real-time wind speed and the target tip speed ratio, and generating a first control signal based on the difference between the real-time power and the reference power, includes: The target rotational speed is calculated based on the real-time wind speed and the target tip speed ratio, and the reference power is calculated based on the target rotational speed. The difference between the real-time power and the reference power is input to the proportional-integral controller to generate a first control signal.

[0055] This invention calculates the target rotational speed based on real-time wind speed and target tip speed ratio, and calculates the reference power based on the target rotational speed. Then, the difference between the real-time power and the reference power is used to generate a first control signal through proportional-integral adjustment. This enables closed-loop tracking of the fan speed to the optimal rotational speed, ensuring that the fan always outputs maximum power.

[0056] Optionally, in this embodiment of the invention, comparing each of the real-time DC voltages with a preset reference value and generating a corresponding second control signal based on each comparison result includes: Each of the real-time DC voltages is compared with a preset reference value, and the comparison results are input to the proportional-integral controller to generate the corresponding second control signal.

[0057] In this embodiment of the invention, by inputting the comparison results of each real-time DC voltage with a preset reference value into a proportional-integral regulator to generate a corresponding second control signal, independent closed-loop control of each DC bus voltage can be achieved, so that each DC bus voltage is stabilized at a preset value.

[0058] Optionally, in this embodiment of the invention, the virtual synchronization control calculation based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter, and the input of the calculated reference quantities to the voltage and current control loop for adjustment, generating a corresponding third control signal, includes: The real-time active power, the preset active power reference value, and the virtual synchro speed are input into the virtual synchro loop for calculation to generate a reference phase; The real-time output voltage, the preset output voltage reference value, the real-time reactive power, and the preset reactive power reference value are input into the reactive power loop for calculation to generate a reference voltage. The reference phase and the reference voltage are input to the voltage and current control loop for adjustment, thereby generating a third control signal.

[0059] The embodiments of the present invention generate a reference phase by inputting real-time active power, a preset active power reference value, and virtual synchronous machine speed into a virtual synchronous loop, and generate a reference voltage by inputting real-time output voltage, a preset output voltage reference value, real-time reactive power, and a preset reactive power reference value into a reactive power loop. This can simulate the characteristics of a synchronous generator, enabling the grid-side converter to have inertial response and grid support capabilities.

[0060] Optionally, in this embodiment of the invention, the step of inputting the reference phase and the reference voltage to the voltage-current control loop for adjustment to generate a third control signal includes: The reference phase and the reference voltage are input to the voltage-current control loop to generate a modulated wave; The modulated wave is subjected to sinusoidal pulse width modulation to generate a third control signal.

[0061] This invention generates a modulation wave by using a reference phase and reference voltage input voltage-current control loop, and then performs sinusoidal pulse width modulation on the modulation wave to generate a third control signal. This enables the conversion of voltage amplitude and phase commands into switching signals that drive the grid-side converter, thereby achieving the output of the desired voltage waveform.

[0062] Optionally, in this embodiment of the invention, the step of inputting the first control signal, the second control signal, and the third control signal to the turbine-side converter, the energy storage battery, and the grid-side converter, respectively, to control the grid-type wind turbine system, includes: The first control signal is input to each of the machine-side converters, so that each of the machine-side converters adjusts the torque of the permanent magnet synchronous wind turbine according to the first control signal; Each of the second control signals is input to the corresponding Buck / Boost half-bridge circuit, so that each of the Buck / Boost half-bridge circuits adjusts the working mode of the corresponding energy storage battery according to the corresponding second control signal. Each of the third control signals is input to the corresponding grid-side converter so that each grid-side converter adjusts its output according to the corresponding third control signal.

[0063] In this embodiment of the invention, by inputting a first control signal to the turbine-side converter to adjust the turbine torque, inputting a second control signal to the Buck / Boost half-bridge circuit to adjust the energy storage battery operating mode, and inputting a third control signal to the grid-side converter for output adjustment, the three sets of control signals can be used to precisely drive their respective actuators, thereby achieving coordinated control of the grid-type wind turbine system.

[0064] like Figure 6 As shown, based on the above method embodiments, corresponding apparatus embodiments are provided; An embodiment of the present invention provides a grid-type wind turbine control device based on distributed energy storage, which is applicable to grid-type wind turbine systems. The grid-type wind turbine system includes a permanent magnet synchronous wind turbine, two sets of parallel back-to-back converters, and two sets of energy storage batteries; wherein, the back-to-back converters include a turbine-side converter and a grid-side converter. The grid-type wind turbine control device includes: a first control signal generation module 601, a second control signal generation module 602, a third control signal generation module 603, and a system control module 604; The first control signal generation module 601 is used to acquire the real-time wind speed and the real-time power and target tip speed ratio of the permanent magnet synchronous wind turbine, calculate the reference power based on the real-time wind speed and the target tip speed ratio, and generate a first control signal based on the difference between the real-time power and the reference power. The second control signal generation module 602 is used to collect the real-time DC voltage of each of the back-to-back converters, compare each of the real-time DC voltages with a preset reference value, and generate a corresponding second control signal based on the comparison results. The third control signal generation module 603 is used to perform virtual synchronous control calculations based on the real-time active power, real-time reactive power and real-time output voltage of each grid-side converter, and input the calculated reference quantities to the voltage and current control loop for adjustment to generate the corresponding third control signal; wherein, the voltage and current control loop includes virtual impedance; The system control module 604 is used to input the first control signal, the second control signal and the third control signal to the turbine-side converter, the energy storage battery and the grid-side converter respectively, so as to realize the control of the grid-type wind turbine system.

[0065] Optionally, in this embodiment of the invention, the first control signal generation module 601 includes: a reference power calculation submodule and a first control signal generation submodule; The reference power calculation submodule is used to calculate the target rotational speed based on the real-time wind speed and the target tip speed ratio, and to calculate the reference power based on the target rotational speed. The first control signal generation submodule is used to input the difference between the real-time power and the reference power to the proportional-integral regulator to generate the first control signal.

[0066] This invention calculates the target rotational speed based on real-time wind speed and target tip speed ratio, and calculates the reference power based on the target rotational speed. Then, the difference between the real-time power and the reference power is used to generate a first control signal through proportional-integral adjustment. This enables closed-loop tracking of the fan speed to the optimal rotational speed, ensuring that the fan always outputs maximum power.

[0067] Optionally, in this embodiment of the invention, the second control signal generation module 602 includes: a second control signal generation submodule; The second control signal generation submodule is used to input the comparison results between each of the real-time DC voltages and the preset reference values ​​to the proportional-integral regulator to generate the corresponding second control signal.

[0068] In this embodiment of the invention, by inputting the comparison results of each real-time DC voltage with a preset reference value into a proportional-integral regulator to generate a corresponding second control signal, independent closed-loop control of each DC bus voltage can be achieved, so that each DC bus voltage is stabilized at a preset value.

[0069] Optionally, in this embodiment of the invention, the third control signal generation module 603 includes: a reference phase calculation submodule, a reference voltage calculation submodule, and a third control signal generation submodule; The reference phase calculation submodule is used to input the real-time active power, the preset active power reference value and the virtual synchro speed into the virtual synchro loop for calculation to generate the reference phase; The reference voltage calculation submodule is used to input the real-time output voltage, the preset output voltage reference value, the real-time reactive power, and the preset reactive power reference value into the reactive power loop for calculation to generate the reference voltage. The third control signal generation submodule is used to input the reference phase and the reference voltage to the voltage and current control loop for adjustment, thereby generating a third control signal.

[0070] The embodiments of the present invention generate a reference phase by inputting real-time active power, a preset active power reference value, and virtual synchronous machine speed into a virtual synchronous loop, and generate a reference voltage by inputting real-time output voltage, a preset output voltage reference value, real-time reactive power, and a preset reactive power reference value into a reactive power loop. This can simulate the characteristics of a synchronous generator, enabling the grid-side converter to have inertial response and grid support capabilities.

[0071] Optionally, in this embodiment of the invention, the third control signal generation submodule includes: a modulation wave generation unit and a third control signal generation unit; The modulation wave generation unit is used to input the reference phase and the reference voltage to the voltage and current control loop to generate a modulation wave; The third control signal generation unit is used to perform sinusoidal pulse width modulation on the modulated wave to generate a third control signal.

[0072] This invention generates a modulation wave by using a reference phase and reference voltage input voltage-current control loop, and then performs sinusoidal pulse width modulation on the modulation wave to generate a third control signal. This enables the conversion of voltage amplitude and phase commands into switching signals that drive the grid-side converter, thereby achieving the output of the desired voltage waveform.

[0073] Optionally, in this embodiment of the invention, the system control module 604 includes: a first control signal control submodule, a second control signal control submodule, and a third control signal control submodule; The first control signal control submodule is used to input the first control signal to each of the machine-side converters, so that each of the machine-side converters adjusts the torque of the permanent magnet synchronous wind turbine according to the first control signal; The second control signal control submodule is used to input each of the second control signals to the corresponding Buck / Boost half-bridge circuits, so that each Buck / Boost half-bridge circuit adjusts the working mode of the corresponding energy storage battery according to the corresponding second control signal. The third control signal control submodule is used to input each of the third control signals to the corresponding grid-side converter, so that each of the grid-side converters can adjust its output according to the corresponding third control signal.

[0074] In this embodiment of the invention, by inputting a first control signal to the turbine-side converter to adjust the turbine torque, inputting a second control signal to the Buck / Boost half-bridge circuit to adjust the energy storage battery operating mode, and inputting a third control signal to the grid-side converter for output adjustment, the three sets of control signals can be used to precisely drive their respective actuators, thereby achieving coordinated control of the grid-type wind turbine system.

[0075] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention, and can implement the grid-type wind turbine control method based on distributed energy storage provided by any of the above-described method embodiments of the present invention.

[0076] This invention provides a first control signal generation module 601 that acquires real-time wind speed and real-time power, calculates a reference power based on the target tip speed ratio, and compares it with the real-time power to generate a first control signal. This provides a signal basis for grid-type wind turbine control to ensure that the wind turbine always operates at its maximum power point. A second control signal generation module 602 acquires the real-time DC voltage of each back-to-back converter and compares it with a preset reference value to generate a second control signal. This provides a signal basis for grid-type wind turbine control to maintain a stable DC bus voltage. A third control signal generation module 603... Virtual synchronous control is performed based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter. A reference value is input to a voltage-current control loop containing virtual impedance to generate a third control signal. This provides a signal basis for grid-connected wind turbine control, enabling the grid-side converter to actively support the grid and suppress power oscillations. The system control module 604 inputs the three control signals to the turbine-side converter, energy storage battery, and grid-side converter respectively, achieving coordinated control of these components. This allows the wind turbine to simultaneously support the grid while operating at full capacity. Compared to existing technologies prone to wind curtailment and frequency drops, this application improves the wind energy utilization rate and grid connection stability of grid-connected wind turbines.

[0077] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0078] Based on the above embodiment of a grid-type wind turbine control method based on distributed energy storage, another embodiment of the present invention provides a terminal device, which includes 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 a grid-type wind turbine control method based on distributed energy storage according to any embodiment of the present invention.

[0079] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0080] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0081] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0082] Based on the above-described method embodiments, another embodiment of the present invention provides a computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the grid-type wind turbine control method based on distributed energy storage described in any of the above-described method embodiments of the present invention.

[0083] The modules / units integrated in the device / terminal equipment, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0084] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A grid-type wind turbine control method based on distributed energy storage, characterized in that, This is applicable to grid-type wind turbine systems, which include permanent magnet synchronous wind turbines, two sets of parallel back-to-back converters, and two sets of energy storage batteries; wherein, the back-to-back converters include a turbine-side converter and a grid-side converter. The grid-type wind turbine control method includes: The system acquires the real-time wind speed and the real-time power and target tip speed ratio of the permanent magnet synchronous fan, calculates the reference power based on the real-time wind speed and the target tip speed ratio, and generates a first control signal based on the difference between the real-time power and the reference power. The real-time DC voltage of each of the back-to-back converters is collected, and each of the real-time DC voltages is compared with a preset reference value. A corresponding second control signal is generated based on the comparison results. Virtual synchronous control calculations are performed based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter. The calculated reference quantities are then input to the voltage and current control loop for adjustment, generating the corresponding third control signal. The voltage and current control loop includes a virtual impedance. The first control signal, the second control signal, and the third control signal are respectively input to the turbine-side converter, the energy storage battery, and the grid-side converter to control the grid-type wind turbine system.

2. The grid-type wind turbine control method based on distributed energy storage as described in claim 1, characterized in that, The grid-type wind turbine system includes permanent magnet synchronous wind turbines, two sets of parallel back-to-back converters, and two sets of energy storage batteries, specifically: The output end of the permanent magnet synchronous fan is connected to the AC side of each of the machine-side converters; Each of the machine-side converters has its DC side connected to the DC side of the corresponding grid-side converter via a DC bus; wherein, a set of back-to-back converters corresponds to one DC bus. The AC side of each grid-side converter is connected to the power grid; Each of the energy storage batteries is connected to the corresponding DC bus via a Buck / Boost half-bridge circuit; wherein, a set of back-to-back converters corresponds to a set of energy storage batteries, and a set of energy storage batteries corresponds to a Buck / Boost half-bridge circuit.

3. The grid-type wind turbine control method based on distributed energy storage as described in claim 1, characterized in that, The step of calculating a reference power based on the real-time wind speed and the target tip speed ratio, and generating a first control signal based on the difference between the real-time power and the reference power, includes: The target rotational speed is calculated based on the real-time wind speed and the target tip speed ratio, and the reference power is calculated based on the target rotational speed. The difference between the real-time power and the reference power is input to the proportional-integral controller to generate a first control signal.

4. The grid-type wind turbine control method based on distributed energy storage as described in claim 1, characterized in that, The step of comparing each of the real-time DC voltages with a preset reference value and generating a corresponding second control signal based on each comparison result includes: Each of the real-time DC voltages is compared with a preset reference value, and the comparison results are input to the proportional-integral controller to generate the corresponding second control signal.

5. The grid-type wind turbine control method based on distributed energy storage as described in claim 1, characterized in that, The virtual synchronous control calculation is performed based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter. The calculated reference quantities are then input to the voltage and current control loop for adjustment, generating corresponding third control signals, including: The real-time active power, the preset active power reference value, and the virtual synchro speed are input into the virtual synchro loop for calculation to generate a reference phase; The real-time output voltage, the preset output voltage reference value, the real-time reactive power, and the preset reactive power reference value are input into the reactive power loop for calculation to generate a reference voltage. The reference phase and the reference voltage are input to the voltage and current control loop for adjustment, thereby generating a third control signal.

6. The grid-type wind turbine control method based on distributed energy storage as described in claim 5, characterized in that, The step of inputting the reference phase and the reference voltage to the voltage-current control loop for adjustment to generate a third control signal includes: The reference phase and the reference voltage are input to the voltage-current control loop to generate a modulated wave; The modulated wave is subjected to sinusoidal pulse width modulation to generate a third control signal.

7. The grid-type wind turbine control method based on distributed energy storage as described in claim 2, characterized in that, The step of inputting the first control signal, the second control signal, and the third control signal to the turbine-side converter, the energy storage battery, and the grid-side converter, respectively, to control the grid-type wind turbine system includes: The first control signal is input to each of the machine-side converters, so that each of the machine-side converters adjusts the torque of the permanent magnet synchronous wind turbine according to the first control signal; Each of the second control signals is input to the corresponding Buck / Boost half-bridge circuit, so that each of the Buck / Boost half-bridge circuits adjusts the working mode of the corresponding energy storage battery according to the corresponding second control signal. Each of the third control signals is input to the corresponding grid-side converter so that each grid-side converter adjusts its output according to the corresponding third control signal.

8. A grid-type wind turbine control device based on distributed energy storage, characterized in that, This is applicable to grid-type wind turbine systems, which include permanent magnet synchronous wind turbines, two sets of parallel back-to-back converters, and two sets of energy storage batteries; wherein, the back-to-back converters include a turbine-side converter and a grid-side converter. The grid-type wind turbine control device includes: a first control signal generation module, a second control signal generation module, a third control signal generation module, and a system control module; The first control signal generation module is used to acquire the real-time wind speed and the real-time power and target tip speed ratio of the permanent magnet synchronous wind turbine, calculate the reference power based on the real-time wind speed and the target tip speed ratio, and generate a first control signal based on the difference between the real-time power and the reference power. The second control signal generation module is used to collect the real-time DC voltage of each of the back-to-back converters, compare each of the real-time DC voltages with a preset reference value, and generate a corresponding second control signal based on the comparison results. The third control signal generation module is used to perform virtual synchronous control calculations based on the real-time active power, real-time reactive power, and real-time output voltage of each grid-side converter, and input the calculated reference quantities to the voltage and current control loop for adjustment to generate the corresponding third control signal; wherein, the voltage and current control loop includes virtual impedance; The system control module is used to input the first control signal, the second control signal and the third control signal to the turbine-side converter, the energy storage battery and the grid-side converter respectively, so as to realize the control of the grid-type wind turbine system.

9. A terminal device, characterized in that, The method includes 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 a grid-type wind turbine control method based on distributed energy storage as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, include: A stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform a grid-type wind turbine control method based on distributed energy storage as described in any one of claims 1-7.

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