Method and system for reconstructing network-forming type energy storage system based on dynamic impedance matching

Abstract

The invention relates to the technical field of micro-grids, and provides a network construction type energy storage system reconstruction method and system based on dynamic impedance matching, and the method comprises the steps: obtaining the real-time impedance and real-time reactance of an associated power grid through a high-frequency disturbance signal injection decoupling mode; meanwhile, according to the voltage phase angle and the voltage drop depth of the associated power grid, respectively obtaining a phase compensation item and a dynamic adjustment coefficient, so as to dynamically adjust the virtual impedance through the phase compensation item and the dynamic adjustment coefficient; and real-time output of the target energy storage system is regulated and controlled by combining closed-loop control of the impedance outer loop and the voltage inner loop, so that voltage offset and broadband oscillation of the associated power grid are suppressed. According to the invention, the phase compensation item obtained according to the voltage phase angle and the dynamic adjustment coefficient obtained according to the voltage drop depth are added to the calculation of the virtual impedance, and the closed-loop control of the impedance outer loop and the voltage inner loop is combined, so that transient impact suppression and oscillation suppression can be realized at the same time, the limitation of separate triggering is effectively avoided, and the reliability of the system is improved. And the power grid voltage stabilization control effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of microgrids, and particularly relates to a reconstruction method and system for a grid-forming energy storage system based on dynamic impedance matching. Background Art

[0002] A grid-forming energy storage system is an energy storage system capable of independently constructing grid voltage and frequency references. Its core function is to actively support the stable operation of the grid by simulating the voltage source characteristics of a synchronous generator. Different from the grid-following energy storage system that relies on the grid, the grid-forming energy storage system can not only operate in parallel with the grid, but also actively support the microgrid it is in under off-grid conditions, maintaining the power supply stability of the microgrid, and can significantly improve the overall stability of the power grid with high penetration of new energy.

[0003] Among them, when the grid-forming energy storage system needs to perform switching control such as grid-connected / off-grid switching and multi-energy complementary switching, the system is prone to impedance mismatch due to impedance mutation before and after switching, which may cause voltage sags or oscillations.

[0004] In the prior art, voltage sag suppression usually takes the voltage outer loop as the core, while oscillation suppression usually relies on the virtual impedance loop and the damping control loop, and the two are triggered separately through priority control. The time-consuming of voltage stabilization control is long, and the power grid stability control effect is insufficient. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a reconstruction method and system for a grid-forming energy storage system based on dynamic impedance matching, so as to solve the problem that there is a target conflict between transient shock suppression and oscillation suppression in the prior art, resulting in insufficient actual stability control effect.

[0006] On the one hand, the present invention provides a reconstruction method for a grid-forming energy storage system based on dynamic impedance matching, including: Inject a high-frequency disturbance signal into the associated power grid of the target energy storage system, and perform decoupling calculation according to the working data of the associated power grid after the disturbance injection to obtain the real-time impedance and real-time reactance of the associated power grid; Collect the real-time working data of the associated power grid, and obtain the voltage phase angle and voltage drop depth according to the real-time working data, so as to obtain a phase compensation term and a dynamic adjustment coefficient respectively according to the voltage phase angle and voltage drop depth; Obtain a virtual impedance according to the real-time working data, the real-time impedance, the real-time reactance, and the dynamic adjustment coefficient of the associated power grid, and additively compensate the phase compensation term to the virtual impedance; Based on the compensated virtual impedance, the grid reference voltage of the voltage inner loop is corrected through the impedance outer loop, and the real-time output of the target energy storage system is coordinately regulated by the corrected grid reference voltage and the voltage inner loop to suppress the output voltage offset and broadband oscillation of the associated grid; wherein, the virtual impedance and the phase compensation term are obtained according to the following calculation formulas: ; ; ; wherein, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage sag depth, is the dynamic regulation coefficient, is the virtual impedance, is the DC bus voltage of the target energy storage system, is the grid reference voltage, is the real-time impedance, is the real-time reactance, is a complex number.

[0007] Optionally, it further includes: collecting the frequency offset of the associated grid, and when the frequency offset exceeds a preset offset threshold, adjusting the frequency of the high-frequency disturbance signal according to the frequency offset, wherein the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula: ; wherein, is the frequency of the high-frequency disturbance signal, is the fundamental frequency of the high-frequency disturbance signal, is the frequency offset of the associated grid, is the amplification factor.

[0008] Optionally, the decoupling calculation is implemented according to the RLS algorithm, and the step of performing decoupling calculation according to the working data of the associated grid after disturbance injection further includes: Obtaining the real-time impedance change amount according to the obtained real-time impedance, and when the real-time impedance change amount exceeds a preset change amount threshold, reducing the forgetting factor of the RLS algorithm to a preset mutation mode forgetting factor.

[0009] Optionally, the step of performing decoupling calculation based on the operating data of the associated power grid after perturbation injection further includes: extracting the spectrum of the high-frequency perturbation signal from the operating data of the associated power grid through a hardware acceleration module, so as to perform decoupling calculation according to the spectrum of the high-frequency perturbation signal, wherein the hardware acceleration module includes a 1024-point radix-2 FFT operation unit.

[0010] Optionally, the impedance outer loop corrects the grid reference voltage of the voltage inner loop according to the following calculation formula: ; wherein, is the corrected grid reference voltage, is the grid reference voltage, is the virtual impedance, is the real-time current of the associated power grid.

[0011] On the other hand, the present invention provides a reconfiguration system for a grid-forming energy storage system based on dynamic impedance matching, including: A first processing module, configured to inject a high-frequency perturbation signal into the associated power grid of the target energy storage system, and perform decoupling calculation according to the operating data of the associated power grid after perturbation injection, so as to obtain the real-time impedance and real-time reactance of the associated power grid; A second processing module, configured to collect the real-time operating data of the associated power grid, and obtain the voltage phase angle and voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient respectively according to the voltage phase angle and voltage sag depth; A third processing module, configured to obtain a virtual impedance according to the real-time operating data, the real-time impedance, the real-time reactance, and the dynamic adjustment coefficient of the associated power grid, and additively compensate the phase compensation term to the virtual impedance; A control module, configured to correct the grid reference voltage of the voltage inner loop through the impedance outer loop according to the compensated virtual impedance, and cooperate with the voltage inner loop through the corrected grid reference voltage to regulate the real-time output of the target energy storage system, so as to suppress the output voltage offset and broadband oscillation of the associated power grid; wherein, the virtual impedance and the phase compensation term are obtained according to the following calculation formulas: ; ; ; wherein, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage sag depth, is the dynamic adjustment coefficient, is the virtual impedance, is the DC bus voltage of the target energy storage system, is the grid reference voltage, is the real-time impedance, is the real-time reactance, is a complex number.

[0012] Optionally, the first processing module is further configured to: collect the frequency offset of the associated power grid, and when the frequency offset exceeds a preset offset threshold, adjust the frequency of the high-frequency disturbance signal according to the frequency offset, wherein the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula: ; wherein, is the frequency of the high-frequency disturbance signal, is the base frequency of the high-frequency disturbance signal, is the frequency offset of the associated power grid, is the amplification factor.

[0013] Optionally, the first processing module is further configured to: perform the decoupling calculation according to the RLS algorithm; obtain the real-time impedance change amount according to the obtained real-time impedance, and when the real-time impedance change amount exceeds a preset change amount threshold, reduce the forgetting factor of the RLS algorithm to a preset mutation mode forgetting factor.

[0014] Optionally, the first processing module includes a hardware acceleration module, and the hardware acceleration module includes a 1024-point radix-2 FFT operation unit.

[0015] Optionally, the impedance outer loop of the control module corrects the grid reference voltage of the voltage inner loop according to the following calculation formula: ; wherein, is the corrected grid reference voltage, is the grid reference voltage, is the virtual impedance, is the real-time current of the associated power grid.

[0016] The reconfiguration method of the network-forming energy storage system based on dynamic impedance matching provided by the present invention uses the high-frequency disturbance signal injection decoupling method to obtain the real-time impedance and real-time reactance of the associated power grid; at the same time, the voltage phase angle and voltage drop depth are obtained according to the real-time operating data of the associated power grid, so as to obtain the phase compensation term and dynamic adjustment coefficient respectively according to the voltage phase angle and voltage drop depth, so that the virtual impedance can be dynamically adjusted through the phase compensation term and dynamic adjustment coefficient; and combined with the closed-loop control of the impedance outer loop and voltage inner loop, the real-time output of the target energy storage system is regulated to suppress the voltage offset and broadband oscillation of the associated power grid. Among them, the phase compensation term obtained according to the voltage phase angle and the dynamic adjustment coefficient obtained according to the voltage drop depth are both added to the calculation of the virtual impedance. Combining the closed-loop control of the impedance outer loop and voltage inner loop can simultaneously achieve transient shock suppression and oscillation suppression, effectively avoiding the limitations of separate triggering, realizing the integration of transient shock suppression and oscillation suppression, and improving the power grid voltage stabilization control effect. Brief Description of the Drawings

[0017] Figure 1 It is the main flowchart of the reconfiguration method of the network-forming energy storage system based on dynamic impedance matching in the embodiment of the present invention.

[0018] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0019] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] To solve the problem that there is a target conflict between transient impact suppression and oscillation suppression in the existing technology, resulting in insufficient actual stability control effect. The present invention provides a method for reconstructing a grid-forming energy storage system based on dynamic impedance matching, which uses a high-frequency disturbance signal injection decoupling method to obtain the real-time impedance and real-time reactance of the associated power grid; at the same time, the voltage phase angle and voltage drop depth are obtained according to the real-time working data of the associated power grid, so as to obtain a phase compensation term and a dynamic adjustment coefficient respectively according to the voltage phase angle and voltage drop depth, so that the virtual impedance can be dynamically adjusted through the phase compensation term and the dynamic adjustment coefficient; and the real-time output of the target energy storage system is regulated by combining the closed-loop control of the impedance outer loop and the voltage inner loop to reduce the deviation of the output voltage. Among them, the phase compensation term obtained according to the voltage phase angle and the dynamic adjustment coefficient obtained according to the voltage drop depth are both added to the calculation of the virtual impedance. By combining the closed-loop control of the impedance outer loop and the voltage inner loop, transient impact suppression and oscillation suppression can be achieved simultaneously, effectively avoiding the limitation of separate triggering, realizing the integration of transient impact suppression and oscillation suppression, and improving the voltage stabilization control effect.

[0023] Specifically, as Figure 1 shown, it is the main flowchart of the method for reconstructing a grid-forming energy storage system based on dynamic impedance matching in this embodiment, including: Step S01: Inject a high-frequency disturbance signal into the associated power grid of the target energy storage system, and perform decoupling calculation according to the working data of the associated power grid after the disturbance injection to obtain the real-time impedance and real-time reactance of the associated power grid; Step S02: Collect the real-time working data of the associated power grid, and obtain the voltage phase angle and voltage drop depth according to the real-time working data, so as to obtain a phase compensation term and a dynamic adjustment coefficient respectively according to the voltage phase angle and voltage drop depth; Step S03: Obtain the virtual impedance according to the real-time working data of the associated power grid, the real-time impedance, the real-time reactance, and the dynamic adjustment coefficient, and add the phase compensation term to the virtual impedance by addition; Step S04: According to the compensated virtual impedance, correct the grid reference voltage of the voltage inner loop through the impedance outer loop, and cooperate with the corrected grid reference voltage and the voltage inner loop to regulate the real-time output of the target energy storage system to suppress the output voltage deviation and broadband oscillation of the associated power grid; Among them, the virtual impedance and the phase compensation term are obtained according to the following calculation formulas: ; ; ; Among them, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage sag depth, is the dynamic regulation coefficient, is the virtual impedance, is the DC bus voltage of the target energy storage system, is the grid reference voltage, is the real-time impedance, is the real-time reactance, is a complex number. Among them, the typical value of the damping coefficient is: .

[0024] To improve the accuracy of obtaining the real-time impedance and real-time reactance of the associated power grid, in this embodiment, step S01 further includes: collecting the frequency offset of the associated power grid, and when the frequency offset exceeds a preset offset threshold, adjusting the frequency of the high-frequency disturbance signal according to the frequency offset, where the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula: ; where, is the frequency of the high-frequency disturbance signal, is the fundamental frequency of the high-frequency disturbance signal, is the frequency offset of the associated power grid, is the amplification factor.

[0025] Taking the 50Hz power grid power frequency as a reference, the parameters of the high-frequency disturbance signal can be selected as: , which is ten times the power frequency, can effectively avoid the power grid power frequency, as well as harmonics such as 100Hz and 150Hz; , which is consistent with the multiple of the fundamental frequency relative to the power frequency, can effectively match the frequency offset of the power grid; a sine wave current signal, and the current amplitude is 1%–5% of the grid rated current; the preset offset threshold can be selected as 0.5Hz, which is 1% of the power frequency. When the power grid frequency fluctuates, through frequency dynamic regulation, the matching effect of the injected high-frequency disturbance signal and the power grid dynamic conditions can be maintained, and the accuracy of decoupling calculation to obtain the real-time impedance and real-time reactance of the power grid can be guaranteed.

[0026] In step S01, the decoupling calculation is implemented according to the RLS (Recursive Least Square) algorithm. The step of performing decoupling calculation based on the operating data of the associated power grid after disturbance injection further includes: obtaining a real-time impedance change amount based on the obtained real-time impedance, and when the real-time impedance change amount exceeds a preset change amount threshold, reducing and adjusting the forgetting factor of the RLS algorithm to a preset mutation mode forgetting factor. In a specific example, the forgetting factor in the normal mode is 0.98, the mutation mode forgetting factor is 0.92, and the change amount threshold is 10% of the nominal impedance of the power grid. By adjusting the forgetting factor, when the power grid changes greatly, the forgetting factor is reduced to improve the tracking speed, and thus the system voltage stabilization control response speed can be improved, and the power grid recovery effect can be improved.

[0027] To improve the decoupling calculation speed, in step S01, it further includes: extracting the spectrum of the high-frequency disturbance signal from the operating data of the associated power grid through a hardware acceleration module to perform decoupling calculation based on the spectrum of the high-frequency disturbance signal, where the hardware acceleration module includes a radix-2 FFT operation unit. Specifically, a 1024-point radix-2 FFT can be selected to meet the calculation requirements.

[0028] To implement the closed-loop control of the impedance outer loop and the voltage inner loop, in this embodiment, the impedance outer loop corrects the grid reference voltage of the voltage inner loop according to the following calculation formula: ; where, is the corrected grid reference voltage, is the grid reference voltage, is the virtual impedance, is the real-time current of the associated power grid.

[0029] The impedance outer loop dynamically adjusts the grid reference voltage of the voltage inner loop through the obtained dynamic virtual impedance. The voltage inner loop tracks and regulates the output voltage of the system through this grid reference voltage, and the dynamic virtual impedance is obtained based on obtaining a phase compensation term and a dynamic regulation coefficient through the voltage phase angle and the voltage drop depth respectively. The regulation responses of broadband oscillation suppression and voltage drop suppression can be added to this grid reference voltage together, and thus broadband oscillation suppression and voltage drop suppression can be simultaneously achieved through the control of the voltage outer loop, improving the voltage stabilization regulation speed.

[0030] The voltage inner loop can specifically be implemented by selecting a PR controller (Proportional-Resonant Controller).

[0031] The present invention also provides a grid-forming energy storage system reconstruction system based on dynamic impedance matching, including: The first processing module is used to inject a high-frequency disturbance signal into the associated power grid of the target energy storage system, and perform decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain the real-time impedance and real-time reactance of the associated power grid; The second processing module is used to collect the real-time operating data of the associated power grid, and obtain the voltage phase angle and voltage drop depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic regulation coefficient respectively according to the voltage phase angle and voltage drop depth; The third processing module is used to obtain a virtual impedance according to the real-time operating data, the real-time impedance, the real-time reactance, and the dynamic regulation coefficient of the associated power grid, and add the phase compensation term to the virtual impedance; The control module is used to correct the grid reference voltage of the voltage inner loop through the impedance outer loop according to the compensated virtual impedance, and cooperate with the voltage inner loop through the corrected grid reference voltage to regulate the real-time output of the target energy storage system, so as to suppress the output voltage offset and broadband oscillation of the associated power grid.

[0032] Wherein, the virtual impedance and the phase compensation term are obtained according to the following calculation formulas: ; ; ; Wherein, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop depth, is the dynamic regulation coefficient, is the virtual impedance, is the DC bus voltage of the target energy storage system, is the grid reference voltage, is the real-time impedance, is the real-time reactance, is a complex number.

[0033] To improve the decoupling accuracy of the high-frequency signal injection method, in this embodiment, the first processing module is further used to: collect the frequency offset of the associated power grid, and when the frequency offset exceeds a preset offset threshold, adjust the frequency of the high-frequency disturbance signal according to the frequency offset, wherein the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula: ; Wherein, is the frequency of the high-frequency disturbance signal, is the fundamental frequency of the high-frequency disturbance signal, is the frequency offset of the associated power grid, is the amplification factor.

[0034] To improve the decoupling calculation efficiency, in this embodiment, the first processing module is further configured to: perform the decoupling calculation according to the RLS algorithm; obtain the real-time impedance change amount based on the obtained real-time impedance, and when the real-time impedance change amount exceeds a preset change amount threshold, reduce and adjust the forgetting factor of the RLS algorithm to a preset mutation mode forgetting factor.

[0035] To improve the decoupling calculation speed and the voltage stabilization control response speed, in this embodiment, the first processing module includes a hardware acceleration module, and the hardware acceleration module includes a radix-2 FFT operation unit.

[0036] To implement the closed-loop control of the impedance outer loop and the voltage inner loop, in this embodiment, the impedance outer loop of the control module corrects the grid reference voltage of the voltage inner loop according to the following calculation formula: ; where, is the corrected grid reference voltage, is the grid reference voltage, is the virtual impedance, is the real-time current of the associated power grid.

[0037] The grid-forming energy storage system reconstruction method and system based on dynamic impedance matching provided by the present invention adopt a high-frequency disturbance signal injection decoupling method to obtain the real-time impedance and real-time reactance of the associated power grid; at the same time, obtain the voltage phase angle and voltage sag depth according to the real-time working data of the associated power grid, so as to obtain the phase compensation term and dynamic adjustment coefficient respectively according to the voltage phase angle and voltage sag depth, so that the virtual impedance can be dynamically adjusted through the phase compensation term and dynamic adjustment coefficient; and combine the closed-loop control of the impedance outer loop and the voltage inner loop to regulate the real-time output of the target energy storage system, so as to suppress the output voltage offset and broadband oscillation of the associated power grid. Among them, the phase compensation term obtained according to the voltage phase angle and the dynamic adjustment coefficient obtained according to the voltage sag depth are both added to the calculation of the virtual impedance. Combining the closed-loop control of the impedance outer loop and the voltage inner loop, transient shock suppression and oscillation suppression can be realized simultaneously, effectively avoiding the limitations of separate triggering, realizing the integration of transient shock suppression and oscillation suppression, and improving the voltage stabilization control effect.

[0038] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] The above-described embodiments only represent several specific implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of this invention patent shall be subject to the appended claims.

Claims

1. A method for reconstructing a network-forming energy storage system based on dynamic impedance matching, characterized in that, Including: Inject a high-frequency disturbance signal into the associated power grid of the target energy storage system, and perform decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain the real-time impedance and real-time reactance of the associated power grid; Collect the real-time operating data of the associated power grid, and obtain the voltage phase angle and voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic regulation coefficient respectively according to the voltage phase angle and voltage sag depth; Obtain a virtual impedance according to the real-time operating data, the real-time impedance, the real-time reactance, and the dynamic regulation coefficient of the associated power grid, and additively compensate the phase compensation term to the virtual impedance; According to the compensated virtual impedance, correct the grid reference voltage of the voltage inner loop through the impedance outer loop, and cooperate with the voltage inner loop through the corrected grid reference voltage to regulate the real-time output of the target energy storage system, so as to suppress the output voltage offset and broadband oscillation of the associated power grid; Wherein, the virtual impedance and the phase compensation term are obtained according to the following calculation formula: ； ； ； Among them, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage sag depth, is the dynamic regulation coefficient, is the virtual impedance, is the DC bus voltage of the target energy storage system, is the grid reference voltage, is the real-time impedance, is the real-time reactance, is a complex number.

2. The method for reconstructing a network-forming energy storage system based on dynamic impedance matching according to claim 1, wherein It also includes: Collect the frequency offset of the associated power grid, and when the frequency offset exceeds a preset offset threshold, adjust the frequency of the high-frequency disturbance signal according to the frequency offset, wherein the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula: ； Among them, is the frequency of the high-frequency disturbance signal, is the fundamental frequency of the high-frequency disturbance signal, is the frequency offset of the associated power grid, is the amplification factor.

3. The method for reconstructing a network-forming energy storage system based on dynamic impedance matching according to claim 1, characterized in that, The decoupling calculation is implemented according to the RLS algorithm, and the step of performing decoupling calculation based on the operating data of the associated power grid after the disturbance injection further includes: Obtain the real-time impedance change amount according to the obtained real-time impedance, and when the real-time impedance change amount exceeds a preset change amount threshold, reduce the forgetting factor of the RLS algorithm to a preset mutation mode forgetting factor.

4. The method for reconstructing a network-forming energy storage system based on dynamic impedance matching according to claim 3, wherein The step of performing decoupling calculation based on the operating data of the associated power grid after the disturbance injection further includes: extracting the spectrum of the high-frequency disturbance signal from the operating data of the associated power grid through a hardware acceleration module, so as to perform decoupling calculation according to the spectrum of the high-frequency disturbance signal, wherein the hardware acceleration module includes a radix-2 FFT operation unit.

5. The method for reconstructing a network-forming energy storage system based on dynamic impedance matching according to claim 1, characterized in that The impedance outer loop corrects the grid reference voltage of the voltage inner loop according to the following calculation formula: ； Among them, is the corrected power grid reference voltage, is the power grid reference voltage, is the virtual impedance, is the real-time current associated with the power grid.

6. A reconfiguration system for a network-forming energy storage system based on dynamic impedance matching, characterized in that Including: A first processing module, configured to inject a high-frequency disturbance signal into the associated power grid of the target energy storage system, and perform decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain the real-time impedance and real-time reactance of the associated power grid; A second processing module, configured to collect the real-time operating data of the associated power grid, and obtain the voltage phase angle and voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic regulation coefficient respectively according to the voltage phase angle and voltage sag depth; A third processing module, configured to obtain a virtual impedance according to the real-time operating data, the real-time impedance, the real-time reactance, and the dynamic regulation coefficient of the associated power grid, and additively compensate the phase compensation term to the virtual impedance; A control module, configured to correct a grid reference voltage of a voltage inner loop according to the compensated virtual impedance, and cooperate with the corrected grid reference voltage and the voltage inner loop to regulate a real-time output of the target energy storage system, so as to suppress an output voltage offset and broadband oscillation of the associated grid; wherein, the virtual impedance and the phase compensation term are obtained according to the following calculation formula: ； ； ； Among them, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage sag depth, is the dynamic regulation coefficient, is the virtual impedance, is the DC bus voltage of the target energy storage system, is the grid reference voltage, is the real-time impedance, is the real-time reactance, is a complex number.

7. The reconfiguration system of the network-forming energy storage system based on dynamic impedance matching according to claim 6, wherein The first processing module is further configured to: collect a frequency offset of the associated grid, and when the frequency offset exceeds a preset offset threshold, adjust a frequency of the high-frequency disturbance signal according to the frequency offset, wherein the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula: ； Among them, is the frequency of the high-frequency disturbance signal, is the fundamental frequency of the high-frequency disturbance signal, is the frequency offset of the associated power grid, is the amplification factor.

8. The reconfiguration system of the network-forming energy storage system based on dynamic impedance matching according to claim 6, wherein, The first processing module is further configured to: perform the decoupling calculation according to the RLS algorithm; obtain a real-time impedance change amount according to the obtained real-time impedance, and when the real-time impedance change amount exceeds a preset change amount threshold, reduce a forgetting factor of the RLS algorithm to a preset mutation mode forgetting factor.

9. The network-forming energy storage system reconstruction system based on dynamic impedance matching according to claim 8, wherein The first processing module includes a hardware acceleration module, and the hardware acceleration module includes a 1024-point radix-2 FFT operation unit.

10. The reconfiguration system of the network-forming energy storage system based on dynamic impedance matching according to claim 6, characterized in that, The impedance outer loop of the control module corrects the grid reference voltage of the voltage inner loop according to the following calculation formula: ； Among them, is the corrected power grid reference voltage, is the power grid reference voltage, is the virtual impedance, is the real-time current associated with the power grid.

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