Voltage active support type energy storage networking control method and system

Abstract

The invention discloses a voltage active support type energy storage networking control method and system, and belongs to the technical field of networking equipment control. The method comprises the following steps: acquiring an actually measured frequency, comparing the actually measured frequency with a reference frequency, and performing primary frequency modulation according to a comparison result; a synchronous generator rotor motion equation is simulated, virtual inertia and virtual damping are introduced in control, the virtual rotating speed of the energy storage converter is obtained, and then a virtual internal potential phase angle is obtained; generating a virtual voltage phase through power difference feedforward and PID control in response to power change; and performing dp conversion control according to the virtual internal potential phase angle and the virtual voltage phase to realize active voltage support. According to the method, the active supporting capability of the system is improved, and the dynamic stability of the system is improved.

Description

Technical Field

[0001] The present invention proposes a voltage active support type energy storage network control method and system, belonging to the technical field of network type equipment control. Background Art

[0002] With the rapid development of renewable energy technology, new energy has gradually become the main body of the power system, but its intermittent and volatile nature has brought challenges to the stable operation of the power grid. The large-scale grid connection of clean energy such as wind power and photovoltaics has affected the frequency and voltage stability of the power grid due to the lack of inertia and damping characteristics of traditional synchronous generators.

[0003] The grid-following energy storage system is essentially a current source, and its working state depends on the voltage and frequency of the grid. In the grid-following mode, the converter of the energy storage system will follow the phase information of the grid and measure the phase information of the grid connection point (PCC) through the phase-locked loop (PLL) to achieve synchronization with the grid. The grid-following energy storage system cannot provide voltage and frequency support independently and must rely on the voltage and frequency of the grid to operate. It is usually used to supplement the instantaneous power demand of the grid and improve the stability and reliability of the grid. The grid-following energy storage system is suitable for occasions where the grid stability is good and no additional voltage and frequency support is required.

[0004] The grid-type energy storage system is essentially a voltage source that can set voltage parameters internally and output stable voltage and frequency. The grid-type converter adopts a power synchronization strategy similar to that of a synchronous generator and can achieve synchronization without the help of a phase-locked loop.

[0005] In a power grid with weak system strength and low physical inertia, the grid-type energy storage system can provide virtual inertia and damping to enhance the stability of the power grid. The grid-type energy storage system can not only be connected to the grid, but also operate off the grid, and has a strong support capacity for the power grid. It can effectively improve the problems of short-circuit capacity and lack of rotational inertia of the new power system, improve the short-circuit ratio of multiple new energy stations, and improve the impedance characteristics of the power grid. The grid-type energy storage system also has additional functions such as primary frequency regulation, voltage regulation, and damping suppression. The grid-type energy storage system is more suitable for new power systems, especially in areas with a high proportion of new energy and poor grid stability.

[0006] Compared with grid-following energy storage, grid-building energy storage can provide better frequency and voltage support capabilities, which is particularly important for large-scale grid connection of new energy sources in new power systems. Grid-building energy storage simulates the power synchronization characteristics of conventional synchronous generators and can more effectively support the power grid, including frequency and voltage stability. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a voltage active support type energy storage grid control method and system. The method simulates the reactive voltage regulation and active frequency regulation characteristics of synchronous generators, so that the energy storage system can provide the voltage, frequency and autonomous inertia support required by the power grid, improve the ability of active support for the system, and improve the dynamic stability of the system.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a voltage active support type energy storage network control method, comprising: Obtain the measured frequency and compare it with the reference frequency, and perform a frequency modulation according to the comparison result; Simulate the synchronous generator rotor motion equation, introduce virtual inertia and virtual damping in the control, obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle; Generate virtual voltage phase through power difference feedforward and PID control and respond to power changes; DP conversion control is performed according to the virtual internal potential phase angle and virtual voltage phase to achieve active voltage support.

[0009] In a second aspect, the present invention provides a voltage active support type energy storage network control system, comprising: A primary frequency modulation module is used to obtain the measured frequency and compare it with the reference frequency, and perform a primary frequency modulation according to the comparison result; The virtual inertia and damping module is used to simulate the synchronous generator rotor motion equation, introduce virtual inertia and virtual damping in the control, obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle; A feedforward control module for generating a virtual voltage phase by power difference feedforward and PID control and responding to power changes; The DP conversion control module is used to perform DP conversion control according to the virtual internal potential phase angle and the virtual voltage phase to achieve active voltage support.

[0010] As a further improvement of the present invention, the obtaining of the measured frequency and comparing it with the reference frequency, and performing a frequency modulation according to the comparison result, comprises: Detect grid frequency in real time and compare it with reference frequency; Set the frequency deviation dead zone and respond when the deviation exceeds the dead zone; The additional reference power is calculated according to the frequency deviation and the droop coefficient, and the prime mover speed regulator characteristics of the synchronous generator set are simulated to achieve primary frequency regulation.

[0011] As a further improvement of the present invention, the responding when the deviation exceeds the dead zone includes: If the frequency deviation exceeds the set dead zone width, the actual deviation is output; otherwise the output is 0.

[0012] As a further improvement of the present invention, the virtual frequency modulation control model that responds when the deviation exceeds the dead zone is specifically:

[0013]

[0014] in, is the additional reference power; is the reference frequency; The measured frequency is calculated from the voltage signal collected from the grid side; To set the frequency dead zone; is the droop coefficient.

[0015] As a further improvement of the present invention, the simulated synchronous generator rotor motion equation introduces virtual inertia and virtual damping links in the control; obtains the virtual speed of the energy storage converter, and then obtains the virtual internal potential phase angle, including: The additional reference power is added to the active reference command to obtain the virtual mechanical power; The difference between the virtual mechanical power and the actual output active power is used to simulate the rotor motion equation of the synchronous generator through the virtual inertia and virtual damping control links to obtain the virtual speed; By integrating the virtual rotation speed, we can get the virtual internal potential phase angle.

[0016] As a further improvement of the present invention, the simulated synchronous generator rotor motion equation introduces virtual inertia and virtual damping in the control to obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle, specifically:

[0017] in, is the virtual moment of inertia; The virtual angular velocity of the internal potential of the converter output; is the input mechanical power corresponding to the traditional synchronous machine; is the actual output active power of the converter; is the equivalent virtual damping coefficient; is the rated angular velocity of the system; Outputting a virtual phase angle of the internal potential of the energy storage converter; It is the active reference instruction; is the additional reference power; is the droop coefficient; is the reference frequency; is the measured frequency.

[0018] As a further improvement of the present invention, the equivalent virtual damping coefficient The steady-state power control deviation is eliminated through the DC isolation link, and the damping control is adjusted through the phase shift and amplification links. The specific formula is:

[0019] in, is the time constant of the DC isolation link, , is the time constant of the phase shift link, It is the speed deviation magnification factor.

[0020] As a further improvement of the present invention, the generation of a virtual voltage phase by power difference feedforward and PID control and in response to power changes includes: A feed-forward path is established according to the difference between the output active power and the set value; By connecting the PID control link , adjust the virtual voltage phase inside the converter.

[0021] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the voltage active support type energy storage network control method is implemented when the processor executes the computer program.

[0022] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the voltage active support type energy storage network control method is implemented.

[0023] In a fifth aspect, the present invention provides a computer program product, which includes computer instructions, characterized in that the computer instructions instruct a computer to execute the voltage active support type energy storage network control method.

[0024] This application is mainly aimed at converters, which are power electronic devices. Grid-connected control is a control strategy that relies on power electronic devices to simulate the characteristics of synchronous generators to achieve stable grid connection of new energy.

[0025] The beneficial effects of the present invention compared with the prior art are as follows: The method of the present invention detects the grid frequency in real time and compares it with the reference frequency, combines dead zone control, and performs power adjustment only when necessary, which reduces unnecessary adjustments and improves the response speed and stability of the system. By introducing virtual inertia and damping, the rotor motion equation of the synchronous generator is simulated, so that the energy storage converter can quickly respond to and adjust the power fluctuation and frequency change of the grid like a traditional generator, thereby enhancing the overall stability of the power system. The output power is adjusted by using the droop control strategy to simulate the prime mover speed regulator characteristics of the synchronous generator set to achieve primary frequency modulation. This control strategy can quickly respond to slight changes in the grid frequency, stabilize the grid frequency by adjusting the output power, and improve the reliability and stability of the grid. By introducing virtual inertia and damping, the system's resistance to power disturbances is significantly enhanced. Virtual inertia can slow down the impact of power changes on the system frequency, while virtual damping can suppress frequency fluctuations. The two work together to make the system more stable. The feedforward control link quickly responds to power changes and adjusts the virtual voltage phase inside the converter through power difference feedforward and PID control to achieve active voltage support. This control strategy improves the system's response speed and accuracy to power disturbances, and further enhances the voltage support capability. This control method has strong flexibility and adaptability, and can be adjusted and optimized according to different grid requirements and operating conditions. By realizing active voltage support and rapid power regulation, the energy storage system can better play its role in energy storage and release, and improve the overall utilization and economy of the system. In summary, the voltage active support type energy storage network control method simulates the characteristics of synchronous generators and introduces multiple control strategies such as virtual inertia, damping and feedforward control, which significantly improves the active support capability and stability of the energy storage converter in the power system, and provides a strong guarantee for the safe and stable operation of the power system.

[0026] Furthermore, the introduction of DC isolation, phase shifting and amplification links makes the damping control effect more flexible and effective, and can adjust the control parameters according to actual conditions, thereby improving the system's ability to suppress frequency disturbances and thus improving the system's dynamic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A flow chart of a voltage active support type energy storage network control method provided by the present invention; Figure 2It is the virtual damping and inertia control link of the present invention; Figure 3 This is a control block diagram of the grid-based energy storage converter system of the present invention; Figure 4 A voltage active support type energy storage network control device provided by the present invention; Figure 5 A schematic diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] like Figure 1 As shown, the present invention provides a voltage active support type energy storage network control method, comprising the following steps: S100, obtaining the measured frequency and comparing it with the reference frequency, and performing a frequency modulation according to the comparison result; S200, simulates the synchronous generator rotor motion equation, introduces virtual inertia and virtual damping in the control, obtains the virtual speed of the energy storage converter, and then obtains the virtual internal potential phase angle; S300 generates a virtual voltage phase through power difference feedforward and PID control and responds to power changes; S400, dp conversion control is performed according to the virtual internal potential phase angle and the virtual voltage phase to achieve active voltage support.

[0032] In the above embodiments of the present application, the principle analysis of each step is as follows: The virtual FM control link includes: Detection and comparison is to detect the grid frequency in real time and compare it with the reference frequency. Dead zone control is to set the frequency deviation dead zone, and respond only when the deviation exceeds the dead zone, reducing unnecessary adjustments. Power adjustment is to calculate the additional reference power according to the frequency deviation and droop coefficient, simulate the prime mover speed regulator characteristics of the synchronous generator set, and realize primary frequency regulation. By simulating the prime mover speed regulator characteristics of the synchronous generator set, the output power is adjusted using the droop control strategy to respond to grid frequency changes and maintain grid frequency stability. It can quickly respond to grid frequency changes, realize primary frequency regulation, and improve grid stability.

[0033] Virtual inertia and damping control links include: Power calculation is to add the additional reference power to the active reference command to obtain the virtual mechanical power. Inertia and damping control simulates the rotor motion equation of the synchronous generator through the inertia and damping control link to enhance the system stability. The phase angle obtained by integration is the integration of the virtual speed to obtain the virtual internal potential phase angle for subsequent control. By introducing virtual inertia and damping, the rotor motion equation of the synchronous generator is simulated to enhance the active support capability of the energy storage converter to the power grid. Improve the system's resistance to power disturbances, enhance system stability, and reduce frequency fluctuations.

[0034] Enhanced virtual damping links include: The DC isolation link is added to eliminate the steady-state power control deviation. Phase shift and amplification is to adjust the damping control effect through the phase shift link and the speed deviation amplification factor to enhance the system's ability to suppress frequency disturbances. The DC isolation link eliminates the steady-state power control deviation, and the phase shift and amplification link adjusts the damping control effect to improve the system's ability to suppress frequency disturbances. Further enhance the system's dynamic performance, improve system stability and response speed.

[0035] The feedforward control link specifically includes: Power difference feedforward is to establish a feedforward path based on the difference between the output active power and the set value. PID control is to adjust the virtual voltage phase inside the converter through the PID control link. DP conversion control is to use the adjusted virtual voltage phase in the DP conversion control link to achieve active voltage support.

[0036] Through power difference feedforward and PID control, it can quickly respond to power changes, adjust the virtual voltage phase inside the converter, and realize active voltage support. It can improve the system's response speed and stability to power disturbances, enhance voltage support capabilities, and help maintain grid voltage stability.

[0037] These control links simulate the characteristics of synchronous generators, introduce virtual inertia, damping and feedforward control, and significantly improve the active support capability and stability of the energy storage converter in the power system, providing a strong guarantee for the safe and stable operation of the power system.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The virtual synchronous generator technology simulates the classical second-order rotor motion equation of the synchronous generator through the control module, thereby obtaining inertia and damping characteristics similar to those of the synchronous machine, while also having the ability to regulate frequency and voltage. The control strategy based on the voltage source energy storage converter is as follows: Figure 2 and Figure 3 As shown, the control strategy includes the following steps: (1) Virtual frequency modulation control link, including: Detection and comparison: The measured frequency of the converter detection ( ) and with the reference frequency ( ) for comparison.

[0040] Dead zone control: If the frequency deviation exceeds the set dead zone width ( ), the output is according to the actual deviation; otherwise the output is 0.

[0041] Power adjustment: According to the frequency deviation and droop coefficient ( ) Calculate the additional reference power ( ), to achieve a frequency modulation.

[0042] The main principle is to simulate the prime mover speed governor characteristics of the synchronous generator set, respond to changes in grid frequency by adjusting the output power, and maintain grid frequency stability.

[0043] As a specific example, the speed regulator characteristics of the prime mover of a synchronous generator set are simulated, and its active power-frequency characteristics are simplified. The converter detects the measured frequency, compares it with the reference frequency, and passes through the dead zone control module. If the frequency deviation exceeds the set dead zone width, the actual deviation is output; if the frequency is within the dead zone, the output is 0. The power reference value addition is the output frequency deviation multiplied by the droop coefficient. The energy storage converter achieves primary frequency modulation that responds autonomously to changes in the power system frequency. The virtual frequency modulation control model is expressed as follows:

[0044]

[0045] in, is the additional reference power; is the reference frequency; The measured frequency is calculated from the voltage signal collected from the grid side; To set the frequency dead zone; is the droop coefficient.

[0046] (2) Virtual inertia and damping control link, including: Power calculation: Virtual mechanical power is the additional reference power ( ) plus the active reference command ( ).

[0047] Inertia and damping control: The difference between virtual mechanical power and actual output active power is calculated through inertia ( J ) and damping ( D ) control link to obtain the virtual speed.

[0048] Integrate to get the phase angle: Integrate the virtual speed to get the virtual internal potential phase angle ( ).

[0049] The principle of this step is: simulate the rotor motion equation of the synchronous generator, and by introducing virtual inertia and damping, enhance the active support capability of the energy storage converter to the power grid and improve the system stability.

[0050] As a specific example, the synchronous generator rotor motion equation is simulated, and virtual inertia and virtual damping links are introduced in the control to enhance its active support capability. The virtual mechanical power of the converter is set as the additional reference power obtained by the virtual frequency modulation control link plus the active reference instruction, and the actual output active power of the converter is taken as the virtual electromagnetic power. The difference between the two is obtained after the inertia and damping control link to obtain the virtual speed of the energy storage converter, and the virtual internal potential phase angle can be obtained by integration. The control model is expressed as follows:

[0051] in, is the virtual moment of inertia; The virtual angular velocity of the internal potential of the converter output; is the input mechanical power corresponding to the traditional synchronous machine; is the actual output active power of the converter; is the equivalent virtual damping coefficient; is the rated angular velocity of the system; Outputting a virtual phase angle of the internal potential of the energy storage converter; It is the active reference instruction; is the additional reference power; is the droop coefficient; is the reference frequency; is the measured frequency.

[0052] (3) Enhanced virtual damping link, including: As a specific example, the main steps and principles are: DC isolation link: Add a DC isolation link (time constant ) to eliminate steady-state power control deviation.

[0053] Phase shift and amplification: Through the phase shift link (time constant , and speed deviation magnification ( ), adjust the damping control effect.

[0054] Principle: By improving the virtual damping control strategy, the system's ability to suppress frequency disturbances is enhanced and the system's dynamic performance is improved.

[0055] To enhance the virtual damping control capability, The expression is as follows. A DC isolation link is added to eliminate the steady-state power control deviation. Since the traditional virtual impedance coefficient has little effect on damping, it is chosen to be removed:

[0056] in, is the time constant of the DC isolation link, , is the time constant of the phase shift link, It is the speed deviation magnification factor.

[0057] (4) Feedforward control link, including: Power difference feedforward: A feedforward path is established based on the difference between the output active power and the set value.

[0058] PID control: By connecting the PID control links in series, the virtual voltage phase inside the converter is adjusted.

[0059] DP conversion control: The adjusted virtual voltage phase is used in the DP conversion control link to achieve active voltage support.

[0060] The principle of this step: Through feedforward control, quickly respond to power changes, improve the system's response speed and stability to power disturbances, and enhance voltage support capabilities.

[0061] This embodiment proposes a novel power system power difference feedforward voltage active support method control structure based on virtual inertia control. The control link establishes a feedforward path through the difference between the output active power and the set value, and then connects the PID control link. , generate the virtual voltage phase inside the converter to the dp conversion control link.

[0062] These control links simulate the characteristics of synchronous generators, introduce virtual inertia, damping and feedforward control, and improve the active support capability and stability of the energy storage converter in the power system.

[0063] Figure 3In energy storage, the energy of new energy is converted into other forms of energy and stored so that it can be released back into the power when needed. Overcurrent limitation: refers to the protective measures taken to limit the current in the power system when the current exceeds a certain set value to prevent equipment damage or system instability.

[0064] PWM (Pulse Width Modulation) controls the output voltage and frequency of power electronic devices (such as inverters) by adjusting the width of the pulse. dq transformation: It is the coordinate transformation of the dq coordinate system, such as transforming the three-phase coordinates of electrical quantities into a two-phase dq coordinate system for easy control and analysis. Virtual inertia and damping control are used to simulate the inertial characteristics of traditional synchronous generators, and damping control is used to provide system damping to maintain system stability. Virtual excitation control is used to simulate the excitation system of a synchronous generator to control the output of a brushless DC motor or a variable speed constant frequency wind power generation system.

[0065] like Figure 4 As shown, the second object of the present invention is to provide a voltage active support type energy storage network control system, comprising: A primary frequency modulation module 100 is used to obtain the measured frequency and compare it with the reference frequency, and perform primary frequency modulation according to the comparison result; The virtual inertia and damping module 200 is used to simulate the synchronous generator rotor motion equation, introduce virtual inertia and virtual damping in the control, obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle; A feedforward control module 300 for generating a virtual voltage phase by power difference feedforward and PID control and in response to power variation; The DP conversion control module 400 is used to perform DP conversion control according to the virtual internal potential phase angle and the virtual voltage phase to achieve active voltage support.

[0066] The system is based on the above-mentioned voltage active support type energy storage network control method.

[0067] The present invention effectively improves the short-circuit capacity and power receiving capacity of the system in the new power system. When disturbance or failure occurs, it actively builds system stability, improves the power grid's absorption level of renewable energy power generation, improves the power grid's regulation capability, promotes the absorption of new energy and distributed power sources, and improves the vulnerability of the new power system due to the access of a high proportion of renewable energy and a high proportion of power electronic equipment.

[0068] like Figure 5 As shown, the third purpose of the embodiment of the present invention is to provide an electronic device, including a memory 701, a processor 702, and a computer program stored in the memory 701 and executable on the processor, wherein the processor implements the voltage active support type energy storage network control method when executing the computer program. It also includes a communication interface 703 and a bus 704.

[0069] A fourth objective of an embodiment of the present invention is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the voltage active support type energy storage network control method is implemented.

[0070] A fifth objective of an embodiment of the present invention is to provide a computer program product, which includes computer instructions, and is characterized in that the computer instructions instruct a computer to execute the voltage active support type energy storage grid control method.

[0071] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0073] The present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, readable storage media, optical storage, etc.) containing computer-usable program codes.

[0074] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0075] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A voltage active support type energy storage network control method, characterized in that: include: Obtain the measured frequency and compare it with the reference frequency, and perform a frequency modulation according to the comparison result; Simulate the synchronous generator rotor motion equation, introduce virtual inertia and virtual damping in the control, obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle; Generate virtual voltage phase through power difference feedforward and PID control and respond to power changes; DP conversion control is performed according to the virtual internal potential phase angle and virtual voltage phase to achieve active voltage support.

2. A voltage active support type energy storage network control method according to claim 1, characterized in that: The obtaining of the measured frequency and comparing it with the reference frequency, and performing a frequency modulation according to the comparison result, comprises: Detect grid frequency in real time and compare it with reference frequency; Set the frequency deviation dead zone and respond when the deviation exceeds the dead zone; The additional reference power is calculated according to the frequency deviation and the droop coefficient, and the prime mover speed regulator characteristics of the synchronous generator set are simulated to achieve primary frequency regulation.

3. A voltage active support type energy storage network control method according to claim 2, characterized in that: The response when the deviation exceeds the dead band includes: If the frequency deviation exceeds the set dead zone width, the actual deviation is output; otherwise the output is 0.

4. A voltage active support type energy storage network control method according to claim 2, characterized in that: The virtual frequency modulation control model that responds when the deviation exceeds the dead zone is specifically: in, is the additional reference power; is the reference frequency; The measured frequency is calculated from the voltage signal collected from the grid side; To set the frequency dead zone; is the droop coefficient.

5. A voltage active support type energy storage network control method according to claim 1, characterized in that: The simulated synchronous generator rotor motion equation introduces virtual inertia and virtual damping links in the control; The virtual speed of the energy storage converter is obtained, and then the virtual internal potential phase angle is obtained, including: The additional reference power is added to the active reference command to obtain the virtual mechanical power; The difference between the virtual mechanical power and the actual output active power is used to simulate the rotor motion equation of the synchronous generator through the virtual inertia and virtual damping control links to obtain the virtual speed; By integrating the virtual rotation speed, we can get the virtual internal potential phase angle.

6. A voltage active support type energy storage network control method according to claim 1, characterized in that: The simulated synchronous generator rotor motion equation introduces virtual inertia and virtual damping in the control to obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle, which is specifically: in, is the virtual moment of inertia; The virtual angular velocity of the internal potential of the converter output; is the input mechanical power corresponding to the traditional synchronous machine; is the actual output active power of the converter; is the equivalent virtual damping coefficient; is the rated angular velocity of the system; Outputting a virtual phase angle of the internal potential of the energy storage converter; It is the active reference instruction; is the additional reference power; is the droop coefficient; is the reference frequency; is the measured frequency.

7. A voltage active support type energy storage network control method according to claim 6, characterized in that: The equivalent virtual damping coefficient The steady-state power control deviation is eliminated through the DC isolation link, and the damping control is adjusted through the phase shift and amplification links. The specific formula is: in, is the time constant of the DC isolation link, , is the time constant of the phase shift link, It is the speed deviation magnification factor.

8. A voltage active support type energy storage network control method according to claim 1, characterized in that: The method generates a virtual voltage phase by power difference feedforward and PID control and responding to power changes, including: A feed-forward path is established according to the difference between the output active power and the set value; By connecting the PID control link , adjust the virtual voltage phase inside the converter.

9. A voltage active support type energy storage network control system, characterized in that: include: A primary frequency modulation module is used to obtain the measured frequency and compare it with the reference frequency, and perform a primary frequency modulation according to the comparison result; The virtual inertia and damping module is used to simulate the synchronous generator rotor motion equation, introduce virtual inertia and virtual damping in the control, obtain the virtual speed of the energy storage converter, and then obtain the virtual internal potential phase angle; A feedforward control module for generating a virtual voltage phase by power difference feedforward and PID control and responding to power changes; The DP conversion control module is used to perform DP conversion control according to the virtual internal potential phase angle and the virtual voltage phase to achieve active voltage support.

10. An electronic device, characterized in that: It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the voltage active support type energy storage network control method described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the voltage active support type energy storage network control method according to any one of claims 1 to 8 is implemented.

12. A computer program product, comprising computer instructions, characterized in that: The computer instructions instruct the computer to execute the voltage active support type energy storage network control method described in any one of claims 1-8.

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