A Power Grid Simulator Control Method and System Based on Power Filtering and Current Reconfiguration

Abstract

This invention belongs to the field of interactive control of power grid simulators, and provides a power grid simulator control method and system based on power filtering and current reconstruction. It uses voltage and current collected at the port of the device under test for power calculation, and uses the power quantity as an intermediate variable for interface control. The three-phase active and reactive power are filtered to stably extract the DC component of the power, and the current signal fed back to the real-time simulator is calculated accordingly. This ensures the accuracy of the amplitude and phase of the feedback power frequency current obtained by the real-time simulator, thereby significantly improving the accuracy of PCC port voltage calculation. While maintaining filtering and noise suppression and enhancing system stability margin, this invention reduces simulation error accumulation and voltage deviation, effectively improving the accuracy of PHIL simulation and possessing significant engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of interactive control of power grid simulators, and specifically relates to a power grid simulator control method and system based on power filtering and current reconstruction. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, the proportion of installed capacity of new energy sources has increased rapidly, but their randomness and volatility can easily lead to problems such as voltage sags, frequency shifts, and harmonic distortion. Therefore, before new energy equipment is connected to the grid, its operating characteristics and grid adaptability under various faults and disturbances need to be verified. To this end, a controllable and reproducible grid environment needs to be constructed through specialized devices, namely, a grid simulator.

[0004] Figure 1 The structure shown is a typical power grid simulator test system based on power hardware-in-the-loop (PHIL). It can construct a controllable power grid environment in the laboratory, enabling power devices such as renewable energy grid-connected inverters to complete grid-connection performance verification under energy interaction conditions. The entire PHIL system consists of three parts: an equivalent power grid real-time simulation system, a power grid simulator, and the device under test and the measurement and control loop.

[0005] However, the stability of the PHIL system in the power grid simulator is significantly affected by the characteristics of the power interface. Under the most commonly used voltage source type ideal transformer interface algorithm, when the equivalent impedance on the system side is greater than the impedance on the device under test (DUT) side, the inherent time delay caused by current sampling, interface conversion, and real-time simulation will cause the phase margin of the feedback signal to decrease rapidly when it contains high-frequency components, leading to instability. To address this problem, the current main solution is to introduce a first-order low-pass filter into the current feedback link to eliminate high-frequency components of the feedback current, thereby improving system stability and noise immunity during current sampling. However, the power frequency current signal undergoes amplitude attenuation and phase lag after passing through the low-pass filter. If the real-time simulator directly uses this offset feedback current to calculate the port voltage, the common point voltage will be offset relative to the actual value, failing to accurately reflect the system's response to the DUT and reducing the accuracy and reliability of the PHIL simulation. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a power grid simulator control method and system based on power filtering and current reconstruction. While maintaining the stability improvement and noise immunity brought about by power filtering, this invention effectively avoids the real-time simulator port voltage error problem introduced by direct current filtering, thereby improving the accuracy of the power grid simulator port voltage and the accuracy of power hardware-in-the-loop simulation.

[0007] According to some embodiments, the present invention adopts the following technical solution:

[0008] A power grid simulator control method based on power filtering and current reconstruction includes the following steps:

[0009] Obtain the three-phase voltage and three-phase current at the port of the device under test;

[0010] Calculate the active power and reactive power at the port based on the three-phase voltage and three-phase current signals;

[0011] The calculated active power 、 The reactive power is filtered separately to obtain the filtered three-phase DC active power and reactive power.

[0012] Based on the three-phase voltage on the real-time simulator side, the synchronous rotation angle is obtained, and coordinate transformation is performed to obtain the voltage components in the synchronous rotating coordinate system.

[0013] In the synchronous rotating coordinate system, based on the filtered three-phase DC active power and reactive power and the port voltage components, the current component required to generate the corresponding power response under the current port voltage conditions is calculated.

[0014] The three-phase current feedback quantity is obtained by performing an inverse coordinate transformation on the required current component using the synchronous rotation angle.

[0015] The three-phase current feedback quantity is used as the input of the controlled current source on the real-time simulator side, and introduced into the power grid equivalent model in the real-time simulator. The updated port voltage is calculated based on the system impedance relationship.

[0016] The updated port voltage is used as the output control reference value of the power grid simulator to realize real-time interaction between the power grid simulator and the device under test.

[0017] As an alternative implementation, the real-time simulator generates a desired port voltage command and sends it to the power grid simulator. The port voltage of the power grid simulator is then supplied to the device under test (DUT). The DUT responds to the port voltage and feeds back the current to the real-time simulator.

[0018] As an alternative implementation, the process of calculating the active power and reactive power at the port based on the three-phase voltage and three-phase current signals includes: calculating the active power and reactive power at the port in the manner of instantaneous power.

[0019] As an alternative implementation method, the calculated active power 、The process of filtering reactive power separately includes: inputting the calculated active power and reactive power into a low-pass filter to filter out the power harmonic components caused by voltage and current harmonic coupling and noise during the measurement process, so as to obtain the filtered three-phase DC active power and reactive power.

[0020] As an alternative implementation, the process of obtaining the synchronous rotation angle based on the three-phase voltage on the real-time simulator side includes: using a phase-locked loop to obtain the synchronous rotation angle from the three-phase voltage on the real-time simulator side.

[0021] As an alternative implementation, the coordinate transformation process includes: performing an abc / dq coordinate transformation on the three-phase voltage to obtain the voltage components in a synchronous rotating coordinate system.

[0022] As an alternative implementation, the process of calculating the current component required to generate the corresponding power response under the current port voltage conditions, based on the filtered three-phase DC active and reactive power and the port voltage component, includes:

[0023] ;

[0024] i d , i q The current component required to generate the corresponding power response under the current port voltage conditions. P 0 represents the filtered three-phase DC active power. Q 0 represents the filtered three-phase DC reactive power. v d , v q For port voltage components.

[0025] As an alternative implementation, the process of performing an inverse coordinate transformation of the desired current component using a synchronous rotation angle includes: using a synchronous rotation angle θ For current components i d , i q Perform an inverse dq / abc coordinate transformation to obtain the three-phase current feedback. i a2 , i b2 , i c2 :

[0026] .

[0027] A power grid simulator control system based on power filtering and current reconstruction includes:

[0028] The device under test (DUT) data acquisition module is used to acquire the three-phase voltage and three-phase current at the ports of the DUT.

[0029] The power calculation module is used to calculate the active power and reactive power at the port based on the three-phase voltage and three-phase current signals.

[0030] The filtering module is used to filter the calculated active power. 、 The reactive power is filtered separately to obtain the filtered three-phase DC active power and reactive power.

[0031] The coordinate transformation module is used to obtain the synchronous rotation angle based on the three-phase voltage on the real-time simulator side, and to perform coordinate transformation to obtain the voltage components in the synchronous rotating coordinate system.

[0032] The current component calculation module is used to calculate the current component required to generate the corresponding power response under the current port voltage condition, based on the filtered three-phase DC active power and reactive power and the port voltage component in a synchronous rotating coordinate system.

[0033] The coordinate inverse transformation module is used to perform coordinate inverse transformation on the required current components using the synchronous rotation angle to obtain the three-phase current feedback quantity.

[0034] The port voltage update module is used to take the three-phase current feedback quantity as the input of the controlled current source on the real-time simulator side, introduce it into the power grid equivalent model in the real-time simulator, and calculate the updated port voltage according to the system impedance relationship.

[0035] The control module is used to use the updated port voltage as the output control reference value of the power grid simulator, so as to realize real-time interaction between the power grid simulator and the device under test.

[0036] An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the steps in the method described above.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] This invention uses the voltage and current collected at the port of the device under test for power calculation, and uses the power as an intermediate variable for interface control. It filters the three-phase active and reactive power to stably extract the DC component of the power, and calculates the current signal fed back to the real-time simulator accordingly. This ensures that the amplitude and phase of the feedback power frequency current obtained by the real-time simulator are accurate, thereby significantly improving the accuracy of PCC port voltage calculation. While maintaining filtering and noise suppression and enhancing the system stability margin, this invention reduces the accumulation of simulation errors and voltage deviation, effectively improving the accuracy of PHIL simulation and having significant engineering application value.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0040] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0041] Figure 1 This is a schematic diagram of a power grid simulator structure based on PHIL in one embodiment;

[0042] Figure 2 This is an interaction diagram of a real-time simulator, a power grid simulator, and the device under test in one embodiment.

[0043] Figure 3 This is an equivalent circuit diagram within a real-time simulator in one embodiment;

[0044] Figure 4 This is a schematic diagram of a power grid simulator interface algorithm based on power filtering and current reconstruction in one embodiment;

[0045] Figure 5 This is a schematic diagram of the control process of a power grid simulator based on power filtering and current reconstruction in one embodiment. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Where there is no conflict, the embodiments and features described in this application may be combined with each other.

[0050] Example 1

[0051] A power grid simulator control method based on power filtering and current reconstruction, such as Figure 5As shown, it includes the following steps:

[0052] Step 1: Acquisition of voltage and current of the device under test. Real-time sampling of the three-phase voltage at the ports of the device under test. u a1 , u b1 , u c1 and three-phase current i a1 , i b1 , i c1 , recorded as u DUT and i DUT .

[0053] Step 2: Calculation of power at the port of the device under test. Based on the acquired three-phase voltage and three-phase current signals, calculate the active power at the port according to the instantaneous power formula. P 1(t) and reactive power Q 1(t).

[0054] Step 3: Power signal filtering. Filter the calculated active power... P 1(t) and reactive power Q 1(t) is input into a low-pass filter to filter out the power harmonic components caused by voltage and current harmonic coupling and noise during the measurement process, thus obtaining the filtered three-phase DC active power. P 0 and reactive power Q 0.

[0055] Step 4: Synchronization angle acquisition and abc / dq coordinate transformation. Sample the three-phase voltage on the real-time simulator side. u a2 , u b2 , u c2 , recorded as u abc Input it into the phase-locked loop to obtain the synchronous rotation angle. θ (t), for u abc Perform an abc / dq coordinate transformation to obtain the voltage component v in the synchronous rotating coordinate system. d ,v q .

[0056] Step 5: Current Reconstruction. In the synchronous rotating coordinate system, based on the filtered active power... P 0. Reactive power Q 0 and port voltage components v d ,v q The current component required to generate the corresponding power response under the current PCC port voltage condition can be calculated by reverse calculation. i d , i q .

[0057] Step 6: Inverse transformation of dq / abc coordinates. Utilizing the synchronous rotation angle... θ (t) for current components i d , i q Perform an inverse dq / abc coordinate transformation to obtain the three-phase current feedback. i a2 , i b2 , i c2 .

[0058] Step 7: PCC Current Injection and PCC Voltage Calculation. The three-phase current feedback is used as the input to the controlled current source on the real-time simulator side. This is introduced into the equivalent power grid model in the real-time simulator, and the updated PCC port voltage is calculated based on the system impedance relationship. U PCC .

[0059] Step 8: The power grid simulator outputs control voltage. The port voltage... U PCC As the output control reference value of the power grid simulator, it enables real-time interaction between the power grid simulator and the device under test.

[0060] The following is a detailed description:

[0061] This method first calculates the corresponding active and reactive power using the voltage and current at the port of the device under test, and then performs low-pass filtering on the power signal to obtain a stable DC power input. Subsequently, in a synchronous rotating coordinate system, a current reference signal that can generate a corresponding power response under the current real-time simulator port voltage condition is calculated based on the filtered active and reactive power. Finally, the current reference signal is used as the input of the controlled current source.

[0062] In a power hardware-in-the-loop testing system, the power grid simulator, real-time simulator, and device under test together constitute a closed-loop electrical system, and their interaction relationships are as follows: Figure 2 As shown, the real-time simulator generates the desired port voltage command based on the constructed power grid model and control algorithm, and the port voltage is output by the power amplification unit of the power grid simulator. The device under test responds to the port voltage and feeds current back to the real-time simulator.

[0063] like Figure 3 As shown, the voltage signal supplied by the real-time simulator to the power grid simulator is the PCC port voltage. U PCC Feedback current I DUT The actual current is collected from the device under test.

[0064] In practical applications, in order to meet the closed-loop stability and noise immunity requirements of the PHIL system, a low-pass filter is usually introduced in the current feedback to suppress high-frequency noise and unstable components.

[0065] However, directly applying a low-pass filter to the feedback current inevitably introduces amplitude attenuation and phase lag into the power frequency component, causing a deviation between the feedback current acquired by the real-time simulator and the actual current of the device under test. This deviation is further mapped to the PCC port voltage through the system's equivalent impedance relationship, resulting in errors in the amplitude and phase of the PCC port voltage, thereby reducing the realism and reliability of the PHIL simulation results.

[0066] The mathematical derivation of the above argument is as follows (only the fundamental component is discussed in the derivation):

[0067] exist Figure 3 In the circuit shown, the device under test is considered a current source. I DUT Injecting into the PCC allows Kirchhoff's Current Law (KCL) to be applied at the PCC:

[0068] (1)

[0069] in, For the common point port voltage, This is the grid voltage. The equivalent impedance of the power grid. The equivalent impedance of the device under test. This is the feedback current of the device under test.

[0070] Simplifying formula (1) yields:

[0071] (2)

[0072] To ensure system closed-loop stability and filter out noise during the measurement process, a low-pass filter is used in the current feedback loop. The original feedback current is specified as... I DUT The current used by the real-time simulator after low-pass filtering is I DUT,2 Then by I DUT,2 The calculated PCC port voltage contains errors:

[0073] (3)

[0074] Write the current in terms of amplitude and phase:

[0075] (4)

[0076] in, This represents the amplitude of the feedback current before filtering. This represents the amplitude of the filtered feedback current. This is the filtered feedback current of the device under test. The phase of the feedback current before filtering. This represents the phase of the filtered feedback current.

[0077] The magnitude of the current deviation is:

[0078] (5)

[0079] Substituting into (3), we obtain the PCC port voltage amplitude error:

[0080] (6)

[0081] Let the phase error of the PCC port voltage be:

[0082] (7)

[0083] This is the common point port voltage calculated from the filtered current.

[0084] The absolute value of the error satisfies the triangle geometric inequality:

[0085] (8)

[0086] Substituting formulas (2) and (3) into the equations, we obtain the upper limit of the phase error of the PCC port voltage:

[0087] (9)

[0088] Therefore, the feedback current I DUT Amplitude and phase shifts will cause U PCC The amplitude and phase shifts affect the accuracy of the power grid simulator. Therefore, it is necessary to consider improving the interface algorithm to reduce errors.

[0089] Power grid simulator interface algorithm based on power filtering and current reconstruction:

[0090] To avoid PCC port voltage errors caused by direct low-pass filtering of the current, this invention proposes a power grid simulator interface algorithm based on power filtering and current reconstruction, such as... Figure 4 As shown.

[0091] Three-phase current and voltage are measured at the device under test, including harmonics:

[0092] (10)

[0093] (11)

[0094] in, ;

[0095] The current active and reactive power are calculated and divided into DC and AC components. The DC component is mainly generated by the fundamental frequencies of voltage and current; the AC component originates from the difference frequency effect caused by the coupling of different frequency harmonic components in voltage and current, as well as noise during the measurement process.

[0096] (12)

[0097] (13)

[0098] in, For each harmonic order, The initial phase of the voltage of the h-th harmonic is... The initial phase of the current is the kth harmonic.

[0099] Then active power P reactive power Q The three-phase DC active power is obtained by passing the first-order low-pass filter. P 0, reactive power Q 0.

[0100] (14)

[0101] (15)

[0102] Then, the filtered active power P 0. Reactive power Q 0. The real-time simulator incorporates the PCC port voltage into the current calculation process in the dq coordinate system, thereby generating the current under the condition of the PCC port voltage. P 0、 Q 0 Required Current i d , i q (12).

[0103] The port voltages of the power grid simulator are transformed using abc / dq coordinates:

[0104] (16)

[0105] The power expression in the dq coordinate system is as follows:

[0106] (17)

[0107] (18)

[0108] Inverse current analysis yields:

[0109] (19)

[0110] Then, i d , i q After dq / abc coordinate transformation, the reference current in the abc coordinate system is obtained and used as... Figure 4 The value of the controlled current source.

[0111] (20)

[0112] Because the power generated by the fundamental voltage and current is DC, there is no amplitude attenuation or phase shift during the low-pass filtering process. Therefore, the fundamental current reference value obtained after the inverse transformation, i.e., formula (20), also does not have amplitude attenuation or phase shift. Thus, we have:

[0113] (twenty one)

[0114] Substituting into formulas (6) and (9), we get:

[0115] (twenty two)

[0116] The method proposed in this embodiment maintains the stability improvement and noise immunity brought by power filtering, while effectively avoiding the real-time simulator port voltage error problem introduced by direct current filtering, thereby improving the accuracy of the power grid simulator port voltage and the accuracy of power hardware-in-the-loop simulation.

[0117] Example 2

[0118] A power grid simulator control system based on power filtering and current reconstruction includes:

[0119] The device under test (DUT) data acquisition module is used to acquire the three-phase voltage and three-phase current at the ports of the DUT.

[0120] The power calculation module is used to calculate the active power and reactive power at the port based on the three-phase voltage and three-phase current signals.

[0121] The filtering module is used to filter the calculated active power. 、 The reactive power is filtered separately to obtain the filtered three-phase DC active power and reactive power.

[0122] The coordinate transformation module is used to obtain the synchronous rotation angle based on the three-phase voltage on the real-time simulator side, and to perform coordinate transformation to obtain the voltage components in the synchronous rotating coordinate system.

[0123] The current component calculation module is used to calculate the current component required to generate the corresponding power response under the current port voltage condition, based on the filtered three-phase DC active power and reactive power and the port voltage component in a synchronous rotating coordinate system.

[0124] The coordinate inverse transformation module is used to perform coordinate inverse transformation on the required current components using the synchronous rotation angle to obtain the three-phase current feedback quantity.

[0125] The port voltage update module is used to take the three-phase current feedback quantity as the input of the controlled current source on the real-time simulator side, introduce it into the power grid equivalent model in the real-time simulator, and calculate the updated port voltage according to the system impedance relationship.

[0126] The control module is used to use the updated port voltage as the output control reference value of the power grid simulator, so as to realize real-time interaction between the power grid simulator and the device under test.

[0127] Example 3

[0128] An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the steps in the method provided in Embodiment 1.

[0129] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of one or more computer-usable storage media (including, but not limited to, disk storage, etc.) containing computer-usable program code. CD - ROM It takes the form of a computer program product implemented on (such as optical memory, etc.).

[0130] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0131] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0133] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art without creative effort within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power filter and current reconstruction based grid simulator control method, characterized in that, Includes the following steps: Obtain the three-phase voltage and three-phase current at the port of the device under test; Calculate the active power and reactive power at the port based on the three-phase voltage and three-phase current signals; The calculated active power 、 The reactive power is filtered respectively to obtain filtered three-phase direct current active power and reactive power. Based on the three-phase voltage on the real-time simulator side, the synchronous rotation angle is obtained, and coordinate transformation is performed to obtain the voltage components in the synchronous rotating coordinate system. In the synchronous rotating coordinate system, based on the filtered three-phase DC active power and reactive power and the port voltage components, the current component required to generate the corresponding power response under the current port voltage conditions is calculated. The three-phase current feedback quantity is obtained by performing an inverse coordinate transformation on the required current component using the synchronous rotation angle. The three-phase current feedback quantity is used as the input of the controlled current source on the real-time simulator side, and introduced into the power grid equivalent model in the real-time simulator. The updated port voltage is calculated based on the system impedance relationship. The updated port voltage is used as the output control reference value of the power grid simulator to realize real-time interaction between the power grid simulator and the device under test; The process of calculating the current component required to generate the corresponding power response under the current port voltage conditions, based on the filtered three-phase DC active and reactive power and the port voltage components, includes: ； i d , i q The current component required to generate the corresponding power response under the current port voltage conditions. P 0 represents the filtered three-phase DC active power. Q 0 represents the filtered three-phase DC reactive power. v d , v q For port voltage components.

2. The power grid simulator control method based on power filtering and current reconstruction as described in claim 1, characterized in that, The real-time simulator generates the desired port voltage command and sends it to the power grid simulator. The power grid simulator then transmits the port voltage to the device under test (DUT). The DUT responds to the port voltage and feeds back the current to the real-time simulator.

3. The power grid simulator control method based on power filtering and current reconstruction as described in claim 1, characterized in that, The process of calculating the active and reactive power at the port based on the three-phase voltage and three-phase current signals includes: calculating the active and reactive power at the port in the manner of instantaneous power.

4. The power grid simulator control method based on power filtering and current reconstruction as described in claim 1, characterized in that, The calculated active power 、 The process of filtering reactive power separately includes: inputting the calculated active power and reactive power into a low-pass filter to filter out the power harmonic components caused by voltage and current harmonic coupling and noise during the measurement process, so as to obtain the filtered three-phase DC active power and reactive power.

5. The power grid simulator control method based on power filtering and current reconstruction as described in claim 1, characterized in that, The process of obtaining the synchronous rotation angle based on the three-phase voltage on the real-time simulator side includes: inputting the three-phase voltage on the real-time simulator side into the phase-locked loop to obtain the synchronous rotation angle.

6. The power grid simulator control method based on power filtering and current reconstruction as described in claim 1, characterized in that, The process of coordinate transformation includes: performing an abc / dq coordinate transformation on the three-phase voltage to obtain the voltage components in the synchronous rotating coordinate system.

7. The power grid simulator control method based on power filtering and current reconstruction as described in claim 1, characterized in that, The process of performing inverse coordinate transformation of the required current component using the synchronous rotation angle includes: using the synchronous rotation angle θ For current components i d , i q Perform an inverse dq / abc coordinate transformation to obtain the three-phase current feedback. i a2 , i b2 , i c2 : 。 8. A power grid simulator control system based on power filtering and current reconstruction, employing the method described in claim 1, characterized in that, include: The device under test (DUT) data acquisition module is used to acquire the three-phase voltage and three-phase current at the ports of the DUT. The power calculation module is used to calculate the active power and reactive power at the port based on the three-phase voltage and three-phase current signals. The filtering module is used to filter the calculated active power. 、 The reactive power is filtered separately to obtain the filtered three-phase DC active power and reactive power. The coordinate transformation module is used to obtain the synchronous rotation angle based on the three-phase voltage on the real-time simulator side, and to perform coordinate transformation to obtain the voltage components in the synchronous rotating coordinate system. The current component calculation module is used to calculate the current component required to generate the corresponding power response under the current port voltage condition, based on the filtered three-phase DC active power and reactive power and the port voltage component in a synchronous rotating coordinate system. The coordinate inverse transformation module is used to perform coordinate inverse transformation on the required current components using the synchronous rotation angle to obtain the three-phase current feedback quantity. The port voltage update module is used to take the three-phase current feedback quantity as the input of the controlled current source on the real-time simulator side, introduce it into the power grid equivalent model in the real-time simulator, and calculate the updated port voltage according to the system impedance relationship. The control module is used to use the updated port voltage as the output control reference value of the power grid simulator, so as to realize real-time interaction between the power grid simulator and the device under test.

9. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, perform the steps of the method according to any one of claims 1-7.

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