Reconfiguration method and system of grid-type energy storage system based on dynamic impedance matching

Abstract

The present invention relates to the field of microgrid technology, and provides a method and system for reconstructing a grid-type energy storage system based on dynamic impedance matching. The method adopts 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, according to the voltage phase angle and voltage drop depth of the associated power grid, a phase compensation term and a dynamic adjustment coefficient are respectively obtained to dynamically adjust the virtual impedance 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 suppress the voltage offset and broadband oscillation of the associated power grid. The present invention adds the phase compensation term obtained according to the voltage phase angle and the dynamic adjustment coefficient obtained according to the voltage drop depth to the calculation of the virtual impedance. Combined with the closed-loop control of the impedance outer loop and the voltage inner loop, the method can simultaneously achieve transient impact suppression and oscillation suppression, effectively circumvent the limitation of separate triggering, and improve the voltage stabilization control effect of the power grid.

Description

Technical Field

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

[0002] A grid-connected energy storage system is capable of independently establishing grid voltage and frequency benchmarks. Its core function is to actively support the stable operation of the grid by simulating the voltage source characteristics of synchronous generators. Unlike grid-connected energy storage systems, which rely on the grid, grid-connected energy storage systems can operate both in parallel and in an off-grid state to actively support the microgrid within which they operate, maintaining the power supply stability of the microgrid and significantly improving the overall stability of power grids with high penetration of renewable energy.

[0003] Among them, when the grid-connected energy storage system requires switching control during grid-connected and off-grid switching, multi-energy complementary switching, etc., the system is prone to impedance mismatch due to the impedance mutation before and after switching, which will cause voltage sag or oscillation.

[0004] In the existing technology, voltage sag suppression usually focuses on the voltage outer loop, 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 voltage stabilization control takes a long time and the grid stability control effect is insufficient. Summary of the Invention

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

[0006] In one aspect, the present invention provides a method for reconfiguring a grid-type energy storage system based on dynamic impedance matching, comprising:

[0007] Injecting a high-frequency disturbance signal into an associated power grid of a target energy storage system, and performing a decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain a real-time impedance and a real-time reactance of the associated power grid;

[0008] Collecting real-time operating data of the associated power grid, and obtaining a voltage phase angle and a voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient according to the voltage phase angle and the voltage sag depth respectively;

[0009] Obtaining a 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 adding the phase compensation term to the virtual impedance;

[0010] Based on the compensated virtual impedance, the grid reference voltage of the inner voltage loop is corrected through the impedance outer loop, and the real-time output of the target energy storage system is coordinated with the corrected grid reference voltage and the voltage inner loop to suppress output voltage deviation and broadband oscillation of the associated power grid;

[0011] The virtual impedance and the phase compensation term are obtained according to the following calculation formula:

[0012] ;

[0013] ;

[0014] ;

[0015] in, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop 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, plural.

[0016] Optionally, the method further includes: collecting a 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, wherein the frequency of the adjusted high-frequency disturbance signal is obtained according to the following calculation formula:

[0017] ;

[0018] in, 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 magnification factor.

[0019] Optionally, the decoupling calculation is implemented according to an RLS algorithm, and the step of performing the decoupling calculation according to the operating data of the associated power grid after the disturbance injection further includes:

[0020] A real-time impedance variation is obtained according to the obtained real-time impedance, and when the real-time impedance variation exceeds a preset variation threshold, the forgetting factor of the RLS algorithm is reduced and adjusted to a preset mutation mode forgetting factor.

[0021] Optionally, the step of performing decoupling calculation based on the working data of the associated power grid after disturbance injection also includes: extracting the spectrum of the high-frequency disturbance signal from the working data of the associated power grid through a hardware acceleration module, so as to perform decoupling calculation based on the spectrum of the high-frequency disturbance signal, wherein the hardware acceleration module includes a 1024-point base 2-FFT operation unit.

[0022] Optionally, the impedance outer loop corrects the grid reference voltage of the voltage inner loop according to the following calculation formula:

[0023] ;

[0024] in, 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.

[0025] Another aspect of the present invention provides a grid-type energy storage system reconstruction system based on dynamic impedance matching, comprising:

[0026] A first processing module is configured to inject a high-frequency disturbance signal into an associated power grid of a target energy storage system, and perform a decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain a real-time impedance and a real-time reactance of the associated power grid;

[0027] a second processing module, configured to collect real-time operating data of the associated power grid, and obtain a voltage phase angle and a voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient according to the voltage phase angle and the voltage sag depth, respectively;

[0028] a third processing module, configured to obtain a virtual impedance according to the real-time operating 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;

[0029] a control module configured to correct the grid reference voltage of the inner voltage loop via an impedance outer loop according to the compensated virtual impedance, and to coordinately regulate the real-time output of the target energy storage system via the corrected grid reference voltage and the inner voltage loop to suppress output voltage deviation and broadband oscillation of the associated power grid;

[0030] The virtual impedance and the phase compensation term are obtained according to the following calculation formula:

[0031] ;

[0032] ;

[0033] ;

[0034] in, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop 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, plural.

[0035] Optionally, the first processing module is further configured to: collect a 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:

[0036] ;

[0037] in, 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 magnification factor.

[0038] Optionally, the first processing module is further configured to:

[0039] Perform the decoupling calculation according to the RLS algorithm;

[0040] A real-time impedance variation is obtained according to the obtained real-time impedance, and when the real-time impedance variation exceeds a preset variation threshold, the forgetting factor of the RLS algorithm is reduced and adjusted to a preset mutation mode forgetting factor.

[0041] Optionally, the first processing module includes a hardware acceleration module, and the hardware acceleration module includes a 1024-point radix 2-FFT operation unit.

[0042] 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:

[0043] ;

[0044] in, 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.

[0045] The grid-type energy storage system reconstruction method based on dynamic impedance matching provided by the present invention adopts 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 the phase compensation term and the dynamic adjustment coefficient according to the voltage phase angle and the voltage drop depth respectively, 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 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 added to the calculation of the virtual impedance. Combined with the closed-loop control of the impedance outer loop and the voltage inner loop, transient impulse suppression and oscillation suppression can be achieved simultaneously, effectively avoiding the limitation of separate triggering, realizing the integration of transient impulse suppression and oscillation suppression, and improving the voltage stabilization control effect of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a main flow chart of a method for reconfiguring a grid-type energy storage system based on dynamic impedance matching in an embodiment of the present invention.

[0047] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0048] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0049] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] In order to solve the problem that there is a conflict of objectives between transient impact suppression and oscillation suppression in the prior art, resulting in insufficient actual stabilization control effect. The present invention provides a method for reconstructing a grid-type energy storage system based on dynamic impedance matching, which adopts 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 the phase compensation term and the dynamic adjustment coefficient according to the voltage phase angle and the voltage drop depth, respectively, so that the virtual impedance can be dynamically adjusted by 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 offset 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 added to the calculation of the virtual impedance. Combined with 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 fusion of transient impact suppression and oscillation suppression, and improving the voltage stabilization control effect.

[0052] Specifically, if Figure 1 FIG. 1 is a main flow chart of the method for reconfiguring a grid-type energy storage system based on dynamic impedance matching according to this embodiment, including:

[0053] Step S01: injecting a high-frequency disturbance signal into an associated power grid of a target energy storage system, and performing a 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;

[0054] Step S02: collecting real-time operating data of the associated power grid, and obtaining a voltage phase angle and a voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient according to the voltage phase angle and the voltage sag depth respectively;

[0055] Step S03: obtaining a 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 adding the phase compensation term to the virtual impedance;

[0056] Step S04: Based on the compensated virtual impedance, the grid reference voltage of the inner voltage loop is corrected through the impedance outer loop, and the real-time output of the target energy storage system is coordinated with the corrected grid reference voltage and the voltage inner loop to suppress output voltage deviation and broadband oscillation of the associated power grid.

[0057] The virtual impedance and the phase compensation term are obtained according to the following calculation formula:

[0058] ;

[0059] ;

[0060] ;

[0061] in, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop 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. Typical values of the damping coefficient are: .

[0062] 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, wherein the adjusted frequency of the high-frequency disturbance signal is obtained according to the following calculation formula:

[0063] ;

[0064] in, 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 magnification factor.

[0065] Taking the 50Hz power grid frequency as a reference, the parameters of the high-frequency disturbance signal can be selected as follows: , which is ten times the power frequency, can effectively avoid the power frequency of the power grid and harmonics such as 100Hz and 150Hz; , consistent with the ratio of the fundamental frequency to the power frequency, effectively matching the grid's frequency offset. The sinusoidal current signal has an amplitude of 1%–5% of the grid's rated current. The preset offset threshold can be set to 0.5Hz, equivalent to 1% of the power frequency. When the grid frequency fluctuates, dynamic frequency adjustment ensures that the injected high-frequency disturbance signal matches the grid's dynamic operating conditions, ensuring the accuracy of the real-time impedance and reactance of the grid obtained through decoupling calculations.

[0066] In step S01, the decoupling calculation is performed using the RLS (Recursive Least Square) algorithm. The step of performing the decoupling calculation based on the operating data of the associated power grid after the disturbance injection further includes obtaining a real-time impedance change based on the obtained real-time impedance, and when the real-time impedance change exceeds a preset change threshold, reducing the RLS algorithm's forgetting factor to a preset mutation mode forgetting factor. In one specific example, the forgetting factor in normal mode is 0.98, the forgetting factor in mutation mode is 0.92, and the change threshold is 10% of the nominal impedance of the power grid. By adjusting the forgetting factor, the forgetting factor is reduced when the power grid changes significantly, improving tracking speed, thereby increasing the system voltage stabilization control response speed and enhancing the power grid stabilization effect.

[0067] In order to improve the decoupling calculation speed, in step S01, it also includes: extracting the spectrum of the high-frequency disturbance signal from the working 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, specifically, a 1024-point radix 2-FFT can be selected to meet the calculation requirements.

[0068] To achieve 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:

[0069] ;

[0070] in, 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.

[0071] 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 the output voltage of the control system through the grid reference voltage. The dynamic virtual impedance is obtained based on the phase compensation term and the dynamic adjustment coefficient obtained by the voltage phase angle and the voltage drop depth respectively. The control responses of broadband oscillation suppression and voltage drop suppression can be added to the grid reference voltage, and then broadband oscillation suppression and voltage drop suppression can be simultaneously achieved through the control of the voltage outer loop, thereby improving the voltage stabilization control speed.

[0072] The voltage inner loop can be implemented by using a Proportional-Resonant Controller (PR controller).

[0073] The present invention also provides a grid-type energy storage system reconstruction system based on dynamic impedance matching, comprising:

[0074] A first processing module is configured to inject a high-frequency disturbance signal into an associated power grid of a target energy storage system, and perform a decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain a real-time impedance and a real-time reactance of the associated power grid;

[0075] a second processing module, configured to collect real-time operating data of the associated power grid, and obtain a voltage phase angle and a voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient according to the voltage phase angle and the voltage sag depth, respectively;

[0076] a third processing module, configured to obtain a virtual impedance according to the real-time operating 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;

[0077] A control module is configured to correct the grid reference voltage of the inner voltage loop through an impedance outer loop according to the compensated virtual impedance, and to coordinately regulate the real-time output of the target energy storage system through the corrected grid reference voltage and the inner voltage loop to suppress output voltage deviation and broadband oscillation of the associated power grid.

[0078] The virtual impedance and the phase compensation term are obtained according to the following calculation formula:

[0079] ;

[0080] ;

[0081] ;

[0082] in, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop 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, plural.

[0083] 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 frequency of the adjusted high-frequency disturbance signal is obtained according to the following calculation formula:

[0084] ;

[0085] in, 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 magnification factor.

[0086] To improve decoupling calculation efficiency, in this embodiment, the first processing module is further configured to:

[0087] Perform the decoupling calculation according to the RLS algorithm;

[0088] A real-time impedance variation is obtained according to the obtained real-time impedance, and when the real-time impedance variation exceeds a preset variation threshold, the forgetting factor of the RLS algorithm is reduced and adjusted to a preset mutation mode forgetting factor.

[0089] In order to increase the decoupling calculation speed and improve 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.

[0090] To achieve 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:

[0091] ;

[0092] in, 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.

[0093] The present invention provides a grid-type energy storage system reconstruction method and system based on dynamic impedance matching. The method and system 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, 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 according to the voltage phase angle and the voltage drop depth, respectively, so that the virtual impedance can be dynamically adjusted through the phase compensation term and the dynamic adjustment coefficient. The closed-loop control of the impedance outer loop and the voltage inner loop is combined to regulate the real-time output of the target energy storage system 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 drop depth are added to the calculation of the virtual impedance. Combined with the closed-loop control of the impedance outer loop and the voltage inner loop, transient impulse suppression and oscillation suppression can be achieved simultaneously, effectively avoiding the limitation of separate triggering, realizing the integration of transient impulse suppression and oscillation suppression, and improving the voltage stabilization control effect.

[0094] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0095] The above-described embodiments merely represent several specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for reconfiguring a grid-type energy storage system based on dynamic impedance matching, characterized in that: include: Injecting a high-frequency disturbance signal into an associated power grid of a target energy storage system, and performing a decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain a real-time impedance and a real-time reactance of the associated power grid; Collecting real-time operating data of the associated power grid, and obtaining a voltage phase angle and a voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient according to the voltage phase angle and the voltage sag depth respectively; Obtaining a 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 adding the phase compensation term to the virtual impedance; Based on the compensated virtual impedance, the grid reference voltage of the inner voltage loop is corrected through the impedance outer loop, and the real-time output of the target energy storage system is coordinated with the corrected grid reference voltage and the voltage inner loop to suppress output voltage deviation and broadband oscillation of the associated power grid; The virtual impedance and the phase compensation term are obtained according to the following calculation formula: ； ； ； in, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop 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, plural.

2. The method for reconfiguring a grid-type energy storage system based on dynamic impedance matching according to claim 1, characterized in that: Also includes: The frequency offset of the associated power grid is collected, and when the frequency offset exceeds a preset offset threshold, the frequency of the high-frequency disturbance signal is adjusted according to the frequency offset, wherein the frequency of the high-frequency disturbance signal after adjustment is obtained according to the following calculation formula: ； in, 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 magnification factor.

3. The method for reconfiguring a grid-type 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 the decoupling calculation according to the working data of the associated power grid after the disturbance injection further includes: A real-time impedance variation is obtained according to the obtained real-time impedance, and when the real-time impedance variation exceeds a preset variation threshold, the forgetting factor of the RLS algorithm is reduced and adjusted to a preset mutation mode forgetting factor.

4. The method for reconfiguring a grid-type energy storage system based on dynamic impedance matching according to claim 3, characterized in that: The step of performing decoupling calculation based on the working data of the associated power grid after disturbance injection also includes: extracting the spectrum of the high-frequency disturbance signal from the working 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, wherein the hardware acceleration module includes a radix 2-FFT operation unit.

5. The method for reconfiguring a grid-type 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: ； in, 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.

6. A grid-type energy storage system reconstruction system based on dynamic impedance matching, characterized in that: include: A first processing module is configured to inject a high-frequency disturbance signal into an associated power grid of a target energy storage system, and perform a decoupling calculation based on the operating data of the associated power grid after the disturbance injection to obtain a real-time impedance and a real-time reactance of the associated power grid; a second processing module, configured to collect real-time operating data of the associated power grid, and obtain a voltage phase angle and a voltage sag depth according to the real-time operating data, so as to obtain a phase compensation term and a dynamic adjustment coefficient according to the voltage phase angle and the voltage sag depth, respectively; a third processing module, configured to obtain a virtual impedance according to the real-time operating 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; a control module configured to correct the grid reference voltage of the inner voltage loop via an impedance outer loop according to the compensated virtual impedance, and to coordinately regulate the real-time output of the target energy storage system via the corrected grid reference voltage and the inner voltage loop to suppress output voltage deviation and broadband oscillation of the associated power grid; The virtual impedance and the phase compensation term are obtained according to the following calculation formula: ； ； ； in, is the phase compensation term, is the output voltage phase angle, is the damping coefficient, is the voltage drop 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, plural.

7. The grid-type energy storage system reconstruction system based on dynamic impedance matching according to claim 6 is characterized in that: The first processing module is further configured to: collect a 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: ； in, 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 magnification factor.

8. The grid-type energy storage system reconstruction system based on dynamic impedance matching according to claim 6, characterized in that: The first processing module is further configured to: Perform the decoupling calculation according to the RLS algorithm; A real-time impedance variation is obtained according to the obtained real-time impedance, and when the real-time impedance variation exceeds a preset variation threshold, the forgetting factor of the RLS algorithm is reduced and adjusted to a preset mutation mode forgetting factor.

9. The grid-type energy storage system reconstruction system based on dynamic impedance matching according to claim 8, characterized in that: 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 grid-type energy storage system reconstruction 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: ； in, 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.

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