Wind storage frequency modulation control method and device based on virtual inertia support and medium

Abstract

The invention provides a wind storage frequency modulation control method and device based on virtual inertia support and a medium, and the method comprises the steps: carrying out the aggregation of wind turbine generators through employing an equivalent model, and obtaining the virtual inertia of a wind power plant and the inertia of an energy storage power station; detecting system frequency deviation by introducing frequency tracking negative feedback, and calculating required auxiliary power according to power grid frequency deviation by utilizing inertia response characteristics of wind energy storage; the wind turbine generator releases kinetic energy of a rotor of the wind turbine generator to provide inertia support required by the system; through the design of the energy storage controller, the energy storage system adapts to the operation condition of new energy, necessary inertia support is provided for the system, charging and discharging of the storage battery are controlled, real-time response is achieved, power balance is maintained, and then constant frequency control is achieved. According to the invention, an efficient and integrated control system is constructed, and the flexibility and response speed of the wind energy storage system to cope with power grid frequency fluctuation challenges are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power storage frequency regulation control in power grids, and in particular relates to a wind power storage frequency regulation control method, equipment and medium based on virtual inertia support. Background Art

[0002] Since the output characteristics of renewable energy such as wind power and photovoltaic power are significantly random, intermittent, periodic and volatile during the power generation process, these characteristics have brought unique challenges to the stable operation and dispatch management of the power system. With the large-scale access of new energy, the power output of power generation cannot be controlled on demand, and the accuracy of load prediction on the power side has also dropped significantly, which means that both the power generation side and the user side are uncontrollable, and it is difficult to achieve a strict match between production and demand, which affects the stability of the power system. As a high-quality flexible regulation resource for the power grid, the energy storage system can solve the problems of volatility and strong randomness of new energy output, and provide the necessary inertia support for the system.

[0003] At present, in the scenario of wind power generation and energy storage systems being connected to the grid, due to the intermittent and uncertain nature of wind power generation and the fluctuation of grid load, the grid frequency often fluctuates greatly, affecting the stability and security of the grid. Traditional frequency regulation methods may not be able to respond to such fluctuations in a timely and effective manner, affecting the stability of grid operation. Summary of the invention

[0004] The present invention provides a wind-storage frequency regulation control method based on virtual inertia support, which adjusts the output power of wind turbines, energy storage systems and other controllable power sources to keep the grid frequency within a range with small fluctuations near a set reference value, thereby achieving effective regulation and stable control of the grid frequency.

[0005] Methods include: S101: Aggregate the wind turbines based on the equivalent model to obtain the virtual inertia of the wind farm and the inertia of the energy storage power station; S102: Configure frequency tracking negative feedback to detect system frequency deviation, and calculate the required auxiliary power using the inertia response characteristics of the wind energy storage and the grid frequency deviation; S103: Providing the required inertia for the system based on the release of rotor kinetic energy of the wind turbine generator set; S104: Configure the energy storage controller to adapt the energy storage system to the operating conditions of the new energy, control the battery charging and discharging, respond in real time to maintain power balance, and achieve constant frequency control.

[0006] It should be further explained that step S101 also includes: analyzing the inertial response characteristics of wind, solar and energy storage, aggregating wind turbines using an equivalent model, and expressing the virtual inertia of the wind farm as follows:

[0007] In the formula, is the virtual inertia time constant of the wind farm at time t; is the virtual inertia time constant of the wind turbine at time t; is the rated capacity of the wind turbine; is the installed capacity of the wind farm.

[0008] It should be further noted that in step S102, the inertia response characteristic of the wind energy storage is based on the absolute value of the frequency deviation of the energy storage system exceeding 0.05 Hz and satisfying When the energy storage controller is controlled, inertia support is provided for the energy storage system; Inertia support, Maximum value greater than 10% , response time is less than 0.5s;

[0009] Where: Provide supporting power for energy storage power stations; is the energy storage inertia time constant; is the energy storage rated power.

[0010] It should be further explained that, in step S103, the method of releasing the rotor kinetic energy of the wind turbine to provide inertia for the energy storage system includes: adding a proportional controller to the MPPT control loop on the wind turbine side, generating auxiliary power according to the grid frequency deviation, and actively adjusting the output power to meet the preset frequency regulation requirements of the grid.

[0011] Among them, in the frequency control link, the calculation method of active power addition is:

[0012] In the formula, is the differential control coefficient; is the proportional control coefficient; Measure frequency for the system; is the system reference frequency; The actual active power output of the fan: .

[0013] It should be further explained that in the method, the energy storage system is configured with an energy storage inverter, and the energy storage inverter adopts a dual-loop control method, and the power is calculated by collecting the inductor current and the capacitor voltage to obtain the actual value of active and reactive power; the reference values ​​U and f of the voltage and frequency are calculated by the following formula, and then the voltage reference value is obtained through the limiting link and the three-phase voltage synthesis;

[0014] Where: They are rated voltage / frequency; is the voltage / frequency droop control slope; is the average reactive power / average active power; is the average reactive power / average active power.

[0015] It should be further explained that, in step S104, the energy storage controller includes: a battery, a DC / DC circuit, an inverter, a filter circuit and a transformer; The output electric energy of the battery is transmitted to the AC bus through the DC / DC circuit, inverter, filter circuit and transformer in sequence.

[0016] It should be further explained that, in step S104, the energy storage system includes a two-stage energy storage converter, the two-stage energy storage converter includes a bidirectional DC / DC converter, a bidirectional PWM converter and an LCL filter circuit, and the two-stage PCS includes a direct-direct link and a direct-alternating link; The DC-DC link adopts voltage and current double closed loop control to keep the DC bus voltage constant; The DC-AC link controls the active power and reactive power of the energy storage system.

[0017] It is further necessary to explain that when the wind power output is lower than the preset power threshold, the bidirectional DC / DC converter controls the battery to discharge and maintain power balance; When the output power of the wind power generation unit exceeds the power required by the load, the bidirectional DC / DC converter controls the battery to be in charging mode to absorb the difference in power.

[0018] According to another embodiment of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the wind storage frequency modulation control method based on virtual inertia support when executing the program.

[0019] According to another embodiment of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the wind storage frequency regulation control method based on virtual inertia support are implemented.

[0020] It can be seen from the above technical solutions that the present invention has the following advantages: The wind storage frequency regulation control method based on virtual inertia support provided by the present invention provides inertia support for the energy storage system by introducing frequency tracking negative feedback and designing the energy storage controller. Under extreme frequency conversion conditions, the constant frequency tracking technology ensures that the energy storage device can stably track and maintain the target frequency, maximizes the power regulation capability of the energy storage, and effectively fills the instantaneous gap in system power, realizes efficient inertial support, and ensures the stable operation of the power system. The vector control of the energy storage system focuses on achieving accurate setting of output power, has rapid dynamic response, can respond to power instructions in real time to ensure continuous power regulation, and effectively improves the flexibility and accuracy of energy management. The present invention constructs an efficient and integrated control system by organically integrating virtual inertia control, primary frequency regulation, and secondary frequency regulation control functions, thereby improving the flexibility and response speed of the energy storage system in dealing with the challenges of grid frequency fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a flow chart of the wind storage frequency regulation control method based on virtual inertia support; Figure 2 It is the virtual inertia control diagram of the fan; Figure 3 This is the fan power standby control diagram; Figure 4 The control structure diagram of the energy storage system for the wind storage frequency regulation control process; Figure 5 It is the flow chart of energy storage virtual inertia control; Figure 6 Schematic diagram of an electronic device. DETAILED DESCRIPTION

[0023] The wind-storage frequency regulation control method based on virtual inertia support provided in this application combines the coordinated frequency regulation strategy of wind power and energy storage systems, which can improve the frequency stability and reliability of the power system. The method simulates the inertia characteristics of traditional generators and utilizes the rapid response capabilities of wind power and energy storage systems to achieve effective regulation of the grid frequency.

[0024] The virtual inertia control involved in the present application is a strategy of adding active control based on frequency deviation and frequency change rate on the rotor side of the wind turbine generator set, which participates in frequency regulation by increasing the output electromagnetic power of the wind turbine generator set in a short time, reducing the rotor speed, and releasing the rotor kinetic energy.

[0025] The following is a detailed description of the wind storage frequency regulation control method based on virtual inertia support. For the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are proposed to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0026] It should be understood that when used in the present specification, the term "includes" indicates the presence of the described features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or their collections. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 The figure is a flow chart of a wind storage frequency regulation control method based on virtual inertia support in a specific embodiment, the method comprising: S101: Aggregate wind turbines based on an equivalent model to obtain virtual inertia of the wind farm and inertia of the energy storage power station.

[0029] In some embodiments, a simplified equivalent model of a wind farm is established by considering the mutual influence between wind turbines, such as wake effect, wind direction change, etc. A clustering algorithm is used to group wind turbines in a wind farm and classify them according to parameters such as wind speed and power output of each wind turbine. Each wind turbine group is equivalent to a single unit, and a wind farm containing multiple wind turbines is simplified to a few large-capacity wind turbines determined by wind speed grouping.

[0030] In this embodiment, the virtual inertia of the wind farm under different wind speeds and power outputs is calculated according to the equivalent model. For the virtual inertia, the inertial support capacity that can be provided is achieved by adjusting the speed and power output of the wind turbine.

[0031] In this embodiment, the inertia of the energy storage system can quickly respond and adjust the power output. Moreover, based on the virtual inertia of the wind farm, the inertial support capability provided by the wind farm when the frequency changes is achieved through the rapid response control of the wind turbines in the wind farm.

[0032] S102: Configure frequency tracking negative feedback to detect system frequency deviation, and use the inertia response characteristics of wind energy storage and grid frequency deviation to calculate the required auxiliary power.

[0033] In some embodiments, a frequency detection device is configured in the power grid to monitor the changes in system frequency in real time. A negative feedback control mechanism is used to compare the detected frequency offset as a feedback signal with the frequency reference value set by the system. Based on the comparison result, a control signal is generated to adjust the output power of the wind turbine and the energy storage system to eliminate the frequency offset.

[0034] This embodiment can calculate the required auxiliary power according to the inertia response characteristics of the wind turbine and the energy storage system, as well as the magnitude and direction of the grid frequency deviation. The inertia response characteristics here can reflect the power regulation capability and response speed of the wind turbine and the energy storage system when the frequency changes.

[0035] A method to eliminate grid frequency deviation through real-time monitoring and feedback control. Using the negative feedback control mechanism, the deviation between the actual system frequency and the set frequency is used as a control signal to adjust the output power of the wind turbine and energy storage system to maintain the stability of the grid frequency.

[0036] S103: Providing the required inertia for the energy storage system based on the release of rotor kinetic energy of the wind turbine.

[0037] In some embodiments, when the grid frequency drops, the wind turbine sets adjust their control systems to reduce the rotor speed, thereby releasing the kinetic energy stored in the rotors. The released kinetic energy is converted into electrical energy and output to the grid, providing additional power support for the energy storage system and helping to maintain the stability of the grid frequency.

[0038] During the control process, it is necessary to monitor the speed and power output of the wind turbine in real time to ensure that it operates within a safe range and to avoid excessive release of rotor kinetic energy that may cause the wind turbine to become instable.

[0039] S104: Configure the energy storage controller to adapt the energy storage system to the operating conditions of the new energy, control the battery charging and discharging, respond in real time to maintain power balance, and achieve constant frequency control.

[0040] This embodiment can configure the energy storage controller according to the wind speed change, light intensity change, etc. of the renewable energy. The energy storage controller can monitor the output power of renewable energy, grid frequency, and the state of the energy storage system in real time. Through algorithm optimization and strategy adjustment, the energy storage system can adapt to different renewable energy operating conditions and provide effective power support and frequency regulation capabilities.

[0041] Optionally, the energy storage controller controls the charging and discharging process of the battery according to the real-time monitored parameters and the preset control strategy. When the grid frequency drops or the output power of the new energy is insufficient, the energy storage controller instructs the battery to discharge and provide additional power support for the system; conversely, when the grid frequency rises or the output power of the new energy is excessive, the energy storage controller instructs the battery to charge and store excess energy. By accurately controlling the charging and discharging process and time of the battery, real-time power balance and constant control of the grid frequency can be achieved.

[0042] This embodiment can make the energy storage system adapt to the operating conditions of renewable energy, and can automatically adjust its working state and control strategy according to factors such as the output power change of renewable energy, grid load fluctuation, and weather conditions. For example, when the wind speed is low or the light intensity is insufficient, the energy storage system may need to provide more power support to make up for the lack of renewable energy output; when the wind speed is high or the light intensity is strong, it may need to reduce the output power or charge to store excess electricity.

[0043] This embodiment can also perform constant frequency control, that is, by adjusting the output power of wind turbines, energy storage systems and other controllable power sources, the grid frequency is kept within a range with small fluctuations near the set reference value. Constant frequency control allows the power system to operate stably and can effectively avoid risks such as equipment damage or power outages caused by excessive frequency fluctuations. Effective regulation and stable control of the grid frequency is achieved.

[0044] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process in this embodiment, the present application provides the following specific implementation method. The wind storage frequency regulation control method based on virtual inertia support includes: In some embodiments, by analyzing the inertial response characteristics of wind, solar and energy storage, and using the equivalent model to aggregate and derive the wind turbines, the virtual inertia representation formula of the wind farm can be obtained as follows: (1) In the formula, is the virtual inertia time constant of the wind farm at time t; is the virtual inertia time constant of the wind turbine at time t; is the rated capacity of the wind turbine; is the installed capacity of the wind farm. The inertia response characteristic of wind energy storage refers to when the absolute value of the system frequency deviation exceeds 0.05Hz and satisfies When the inertia support is needed, the system needs to be provided with necessary inertia support to maintain the system stability. Through the design of the energy storage controller, the inertia support can be provided for the system. The maximum value should be greater than 10% , the response time should be less than 0.5s.

[0045] (2)

[0046] Where: Provide supporting power for energy storage power stations; is the energy storage inertia time constant; is the energy storage rated power.

[0047] For wind turbines, the virtual inertia control methods of wind turbines include virtual inertia control (VIC) without power reserve control, power load reduction control with power reserve control, and wind-storage coordinated frequency modulation control.

[0048] In this embodiment, when the wind turbine is working normally, the blades will store a certain amount of rotational kinetic energy, which is related to its rotational inertia. When the load suddenly changes, the active power is released or absorbed by adjusting the blade speed to provide inertia support to the power grid. Since the wind turbine itself has certain energy storage means, there is no need to prepare frequency modulation standby power. Since the rotational inertia of wind turbines is comparable to that of traditional thermal and hydroelectric generators, their inertia time constants and the energy stored are roughly the same. Through corresponding control means, the wind turbine can simulate the frequency characteristics of traditional generators to achieve stable support for the power grid.

[0049] In some specific embodiments, the wind turbine releases the rotor kinetic energy to provide the required inertia support for the energy storage system, see Figure 2 The specific control method is to add a proportional controller to the MPPT control loop on the wind turbine side, generate auxiliary power according to the grid frequency deviation, and actively adjust the output power to meet the grid frequency regulation requirements. When the system frequency fluctuates, the wind turbine releases the rotational inertia in its rotor and actively participates in the frequency regulation process of the system, thereby enhancing the frequency stability of the power system. Under the frequency control link, the additional active power is: (3) In the formula, is the differential control coefficient; is the proportional control coefficient; Measure frequency for the system; is the system reference frequency.

[0050] The actual active power output of the fan: (4) When a wind turbine under virtual inertia control actively participates in frequency control, its additional inertia control may conflict with the maximum power point tracking (MPPT) control, reducing control stability and affecting its economic benefits. At the same time, since the speed of the wind turbine rotor will return to the set value at maximum power after frequency support, this process may also cause frequency fluctuations.

[0051] Reference Figure 3 In response to the problem of abnormal frequency fluctuations, wind turbines adopt power reserve control strategies when actively participating in frequency control, including two common means, pitch angle adjustment and load reduction operation, to make them operate away from the maximum power point and reserve a part of the power for frequency regulation. Pitch angle adjustment is to actively reduce the output power of wind turbines through variable pitch angle control. When the grid frequency fluctuates, the output power can be increased or decreased by adjusting the pitch angle to achieve the purpose of supporting the frequency. Load reduction operation is to make the wind turbine operating speed exceed the MPPT operating speed, thereby achieving load reduction.

[0052] Reference Figure 4 Through the design of the energy storage controller, the energy storage system adapts to the operating conditions of new energy and provides the necessary inertia support for the system. The structure of the energy storage controller is that the battery is connected to the AC bus through the DC / DC circuit, inverter, filter circuit and transformer. In the control of the battery side, the Buck / Boost converter adopts voltage and current dual closed-loop control. In the control of the load side, the droop control is used to stabilize the power of the entire system. Insufficient energy supply is supplemented by energy storage, and excessive energy supply is absorbed by energy storage to ensure the stability of the base export AC bus.

[0053] The control goal of the energy storage inverter in this embodiment is to establish a stable and balanced output voltage for the load. Droop control does not require a communication link. When the load changes, the power of each energy storage can be quickly and accurately distributed, so that the system can reach a safe and stable operating state. The energy storage inverter adopts a dual-loop control method. By collecting the inductor current and capacitor voltage for power calculation, the actual values ​​of active and reactive power are obtained; the reference values ​​U and f of voltage and frequency are calculated by the following formula, and then the voltage reference value is obtained through the limiting link and three-phase voltage synthesis.

[0054] (5) Where: They are rated voltage / frequency; is the voltage / frequency droop control slope; is the average reactive power / average active power; is the average reactive power / average active power.

[0055] In some embodiments, the wind energy storage system uses a two-stage power conversion system (PCS), which includes a bidirectional DC / DC converter, a bidirectional PWM converter and an LCL filter circuit. The two-stage PCS mainly includes a DC-DC link and a DC-AC link. The DC-DC link uses a voltage and current double closed loop to control the DC bus voltage to be constant. The DC-AC link is responsible for controlling the system's active power and reactive power, and the inner loop controls the system's current.

[0056] The bidirectional DC / DC converter in the two-stage PCS of this embodiment can flexibly increase or decrease the DC voltage. In terms of energy transmission, when the wind power output is insufficient, the bidirectional converter controls the battery to discharge and maintain power balance; when the output power of the wind power generation unit exceeds the power required by the load, the DC / DC circuit controls the battery to be in charging mode to absorb the difference in power and ensure reliable operation of the system. During peak load periods of the grid, the PCS can respond quickly to increase or decrease output power to balance supply and demand; in emergency situations, such as power shortages caused by grid failures, the PCS can provide the necessary power support to ensure stable operation of the grid. When the grid voltage fluctuates or the frequency shifts, the PCS can automatically adjust its output to maintain the stability of the grid voltage and frequency, significantly improving the overall operation quality and reliability of the grid.

[0057] like Figure 5 , the present invention further achieves the purpose of providing inertia support for the system by introducing frequency tracking negative feedback to achieve constant frequency control. Under extreme frequency conversion conditions, the constant frequency tracking technology ensures that the energy storage device can stably track and maintain the target frequency, maximizes the power regulation capability of the energy storage, and effectively fills the instantaneous gap in the system power, achieving efficient inertial support and ensuring the stable operation of the power system. The constant frequency control strategy enables the energy storage system to maintain its own high power output level without absorbing energy from the system for charging, further optimizing the frequency regulation performance of the system and improving the overall energy efficiency. Constant frequency control not only improves the frequency regulation capability of energy storage, but also simplifies the frequency regulation control method. By organically integrating the virtual inertia control, primary frequency regulation and secondary frequency regulation control functions, an efficient and integrated control system is constructed, which greatly improves the flexibility and response speed of the energy storage system to cope with the challenges of grid frequency fluctuations.

[0058] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0059] like Figure 6As shown, the present application also provides an electronic device, including a display module 103, a memory 102, a processor 101, and a computer program stored in the memory and executable on the processor 101, wherein the processor 101 implements the steps of a wind storage frequency modulation control method based on virtual inertia support when executing the program.

[0060] In embodiments of the present invention, electronic devices include, but are not limited to, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present application described and / or required herein.

[0061] In the embodiment of the present application, the processor 101 can be implemented by using at least one of an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microcontroller, a microprocessor, and an electronic unit designed to perform the functions described herein. In some cases, such an implementation can be implemented in a controller. For software implementation, implementations such as processes or functions can be implemented with separate software modules that allow execution of at least one function or operation. The software code can be implemented by a software application (or program) written in any appropriate programming language, and the software code can be stored in a memory and executed by a controller.

[0062] The display module 103 is used to display information input by the user or information provided to the user. The display module 103 may include a display panel, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0063] The memory 102 may be used to store software programs and various data. The memory 102 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0064] The present application also provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the wind storage frequency modulation control method based on virtual inertia support are implemented.

[0065] The storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind storage frequency modulation control method based on virtual inertia support, characterized in that: Methods include: S101: Aggregate the wind turbines based on the equivalent model to obtain the virtual inertia of the wind farm and the inertia of the energy storage power station; S102: Configure frequency tracking negative feedback to detect system frequency deviation, and calculate the required auxiliary power using the inertia response characteristics of the wind energy storage and the grid frequency deviation; S103: Providing the required inertia for the system based on the release of rotor kinetic energy of the wind turbine generator set; S104: Configure the energy storage controller to adapt the energy storage system to the operating conditions of the new energy, control the battery charging and discharging, respond in real time to maintain power balance, and achieve constant frequency control.

2. The wind storage frequency modulation control method based on virtual inertia support according to claim 1 is characterized in that: Step S101 also includes: analyzing the inertial response characteristics of wind, solar and energy storage, aggregating wind turbines using an equivalent model, and expressing the virtual inertia of the wind farm as follows: In the formula, is the virtual inertia time constant of the wind farm at time t; is the virtual inertia time constant of the wind turbine at time t; is the rated capacity of the wind turbine; is the installed capacity of the wind farm.

3. The wind storage frequency modulation control method based on virtual inertia support according to claim 1 is characterized in that: In step S102, the inertia response characteristics of the wind energy storage are based on the absolute value of the frequency deviation of the energy storage system exceeding 0.05 Hz and satisfying When the energy storage controller is controlled, inertia support is provided for the energy storage system; Inertia support, Maximum value greater than 10% , response time is less than 0.5s; Where: Provide supporting power for energy storage power stations; is the energy storage inertia time constant; is the energy storage rated power.

4. The wind storage frequency modulation control method based on virtual inertia support according to claim 1 is characterized in that: In step S103, the method of releasing rotor kinetic energy of the wind turbine to provide inertia for the energy storage system includes: adding a proportional controller to the MPPT control loop on the wind turbine side, generating auxiliary power according to the grid frequency deviation, and actively adjusting the output power to meet the preset frequency regulation requirements of the grid. Among them, in the frequency control link, the calculation method of active power addition is: In the formula, is the differential control coefficient; is the proportional control coefficient; Measure frequency for the system; is the system reference frequency; The actual active power output of the fan: 。 5. The wind storage frequency modulation control method based on virtual inertia support according to claim 1 is characterized in that: In the method, the energy storage system is equipped with an energy storage inverter. The energy storage inverter adopts a dual-loop control method. The power is calculated by collecting the inductor current and capacitor voltage to obtain the actual value of active and reactive power. The reference values ​​U and f of voltage and frequency are calculated by the following formula, and then the voltage reference value is obtained through the limiting link and three-phase voltage synthesis. Where: They are rated voltage / frequency; is the voltage / frequency droop control slope; is the average reactive power / average active power; is the average reactive power / average active power.

6. The wind storage frequency modulation control method based on virtual inertia support according to claim 1 is characterized in that: In step S104, the energy storage controller includes: a battery, a DC / DC circuit, an inverter, a filter circuit and a transformer; The output electric energy of the battery is transmitted to the AC bus through the DC / DC circuit, inverter, filter circuit and transformer in sequence.

7. The wind storage frequency modulation control method based on virtual inertia support according to claim 1 is characterized in that: In step S104, the energy storage system includes a two-stage energy storage converter, the two-stage energy storage converter includes a bidirectional DC / DC converter, a bidirectional PWM converter and an LCL filter circuit, and the two-stage PCS includes a direct-direct link and a direct-alternating link; The DC-DC link adopts voltage and current double closed loop control to keep the DC bus voltage constant; The DC-AC link controls the active power and reactive power of the energy storage system.

8. The wind storage frequency modulation control method based on virtual inertia support according to claim 7 is characterized in that: When the wind power output is lower than the preset power threshold, the bidirectional DC / DC converter controls the battery discharge to maintain power balance; When the output power of the wind power generation unit exceeds the power required by the load, the bidirectional DC / DC converter controls the battery to be in charging mode to absorb the difference in power.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the wind storage frequency regulation control method based on virtual inertia support as described in any one of claims 1 to 8 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the wind storage frequency regulation control method based on virtual inertia support as described in any one of claims 1 to 8 are implemented.

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