Current limiting method and system for static var generator based on capacitance parameter

Abstract

The application relates to the field of static reactive power generators, in particular to a current limiting method and system of a static reactive power generator based on a capacitor parameter, which collects power parameters of an alternating current side and a direct current side of the static reactive power generator respectively; determines a current parameter of the direct current side according to the power parameters; establishes a discrete time equation according to the current parameter and the power parameter of the direct current side; obtains a capacitor parameter of the direct current side according to the discrete time equation; determines a current limiting ratio according to the capacitor parameter of the direct current side; determines an output reference current of the static reactive power generator according to the current limiting ratio and a current state of a load to be compensated; and performs a current limiting operation on the static reactive power generator according to the output reference current. The application can monitor the capacitance value of an electrolytic capacitor in real time online, limit the output current according to the attenuation of the capacitance value, and thus can still limit the capacitance when the electrolytic capacitor attenuates, so that the safe operation of the static reactive power generator is ensured and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of static var generators, and more particularly to a current limiting method and system for static var generators based on capacitance parameters. Background Technology

[0002] In PWM rectifier circuits such as Static Var Generators (SVG), the DC support capacitor needs to maintain DC voltage stability, thus requiring a relatively large capacitance value. Therefore, high-voltage electrolytic capacitors are generally used for the DC support capacitor. Considering that the ripple current of a single high-voltage electrolytic capacitor is generally small, while the SVG has high requirements for the ripple current of the DC support capacitor, SVG typically uses multiple high-voltage electrolytic capacitors connected in parallel. However, with multiple high-voltage electrolytic capacitors connected in parallel, due to the dispersion of their loss tangent, perfect current sharing is impossible. Furthermore, high-voltage electrolytic capacitors with larger currents are more prone to overheating, leading to capacitance decay. Capacitance decay of high-voltage electrolytic capacitors can cause problems such as electrolyte leakage, and insufficient capacitance of the DC support capacitor can result in excessive DC voltage fluctuations, ultimately damaging power electronic components. To address the aforementioned issues, a certain margin can be left in the design and selection of electrolytic capacitors to reduce the impact of incomplete current sharing on them, but this will increase costs. Alternatively, several film capacitors can be connected in parallel with electrolytic capacitors. Film capacitors have small capacitance, low loss tangent, and large ripple current, which can divert most of the high-frequency current, but have little impact on the power frequency current. Summary of the Invention

[0003] Considering that existing static var generators use high-voltage electrolytic capacitors to maintain DC voltage stability, but these capacitors are prone to electrolyte leakage and excessive heating leading to capacitance decay, thus failing to guarantee normal and stable operation, this invention provides a current limiting method for static var generators based on capacitance parameters. The method includes the following steps:

[0004] S100: Collect the power parameters of the AC side and DC side of the static var generator; determine the current parameters of the DC side based on the power parameters;

[0005] S200: Based on the current parameters and the power parameters of the DC side, establish a discrete-time equation; based on the discrete-time equation, obtain the capacitance parameters of the DC side;

[0006] S300: Determine the current limiting ratio based on the capacitor parameters on the DC side; determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated.

[0007] S400: Perform current limiting operation on the static var generator according to the output reference current.

[0008] Preferably, in S100, the power parameters of the AC side and DC side of the static var generator are collected; based on the power parameters, the current parameters of the DC side are determined, specifically as follows:

[0009] The instantaneous voltages of the three phases A, B, and C on the AC side of the static var generator are collected. , , and instantaneous current , , ;

[0010] Collect the DC voltage at a sampling point on the DC side of the static var generator. and the DC voltage at the previous sampling point on the DC side. ;

[0011] Using the following formula, the DC current at a certain sampling point on the DC side is determined based on the instantaneous voltage, the instantaneous current, and the DC voltage at a certain sampling point. ,

[0012] .

[0013] Preferably, in S200, a discrete-time equation is established based on the current parameters and the DC-side power parameters; the DC-side capacitance parameters are obtained based on the discrete-time equation, specifically as follows:

[0014] Using the following formula, a discrete-time equation is established based on the DC current, the DC voltage at a certain sampling point, and the DC voltage at the previous sampling point.

[0015]

[0016] In the above formula, This represents the differential result of the capacitance on the DC side. Indicates the sampling frequency;

[0017] The capacitance value on the DC side is obtained by performing a first-order exponential smoothing filter on the differential result of the DC side capacitance.

[0018] Preferably, in S300, the current limiting ratio is determined based on the capacitor parameters on the DC side; the output reference current of the static var generator is determined based on the current limiting ratio and the current state of the load to be compensated, specifically as follows:

[0019] Using the following formula, determine the current limiting ratio based on the capacitance value on the DC side.

[0020]

[0021] In the above formula, Indicates the rate limiting ratio. This indicates the nominal capacitance of the DC-side capacitor. This indicates the capacitance value on the DC side;

[0022] The current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components The output reference current of the static var generator is determined using the following formula.

[0023]

[0024] In the above formula, This indicates the output reference current.

[0025] Preferably, in S400, the static var generator is subjected to current limiting operation based on the output reference current, specifically as follows:

[0026] The actual output current of the static var generator is collected and compared with the output reference current. If the actual output current exceeds the output reference current, a current limiting operation is performed on the static var generator; otherwise, no current limiting operation is performed on the static var generator.

[0027] On the other hand, the present invention provides a current limiting system for a static var generator based on capacitance parameters, the system comprising the following modules:

[0028] The power parameter acquisition module is used to acquire the power parameters of the AC and DC sides of the static var generator.

[0029] A current parameter determination module is used to determine the current parameters on the DC side based on the power parameters.

[0030] The capacitor parameter determination module is used to establish a discrete-time equation based on the current parameter and the DC-side power parameter; and to obtain the DC-side capacitor parameter based on the discrete-time equation.

[0031] The current limiting ratio determination module is used to determine the current limiting ratio based on the capacitor parameters on the DC side;

[0032] The output reference current determination module is used to determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated.

[0033] The current limiting operation module is used to perform current limiting operation on the static var generator based on the output reference current.

[0034] Preferably, the power parameter acquisition module is used to acquire the power parameters of the AC side and DC side of the static var generator, including:

[0035] The instantaneous voltages of the three phases A, B, and C on the AC side of the static var generator are collected. , , and instantaneous current , , ;

[0036] Collect the DC voltage at a sampling point on the DC side of the static var generator. and the DC voltage at the previous sampling point on the DC side. ;

[0037] The current parameter determination module is used to determine the DC side current parameters based on the power parameters, including:

[0038] Using the following formula, the DC current at a certain sampling point on the DC side is determined based on the instantaneous voltage, the instantaneous current, and the DC voltage at a certain sampling point. ,

[0039] .

[0040] Preferably, the capacitor parameter determination module is used to establish a discrete-time equation based on the current parameter and the DC-side power parameter; and to obtain the DC-side capacitor parameter based on the discrete-time equation, including:

[0041] Using the following formula, a discrete-time equation is established based on the DC current, the DC voltage at a certain sampling point, and the DC voltage at the previous sampling point.

[0042]

[0043] In the above formula, This represents the differential result of the capacitance on the DC side. Indicates the sampling frequency;

[0044] The capacitance value on the DC side is obtained by performing a first-order exponential smoothing filter on the differential result of the DC side capacitance.

[0045] Preferably, the current limiting ratio determination module is used to determine the current limiting ratio based on the capacitor parameters on the DC side, including:

[0046] Using the following formula, determine the current limiting ratio based on the capacitance value on the DC side.

[0047]

[0048] In the above formula, Indicates the rate limiting ratio. This indicates the nominal capacitance of the DC-side capacitor. This indicates the capacitance value on the DC side;

[0049] The output reference current determination module is used to determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated, including:

[0050] The current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components The output reference current of the static var generator is determined using the following formula.

[0051]

[0052] In the above formula, This indicates the output reference current.

[0053] Preferably, the current limiting operation module is used to perform current limiting operation on the static var generator according to the output reference current, including:

[0054] The actual output current of the static var generator is collected and compared with the output reference current. If the actual output current exceeds the output reference current, a current limiting operation is performed on the static var generator; otherwise, no current limiting operation is performed on the static var generator.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] This invention discloses a current limiting method and system for a static var generator (SVA) based on capacitor parameters. The method acquires the AC and DC power parameters of the SVA; determines the DC current parameter based on the power parameters; establishes a discrete-time equation based on the current parameter and the DC power parameter; obtains the DC capacitor parameter based on the discrete-time equation; determines the current limiting ratio based on the DC capacitor parameter; determines the output reference current of the SVA based on the current limiting ratio and the current state of the load to be compensated; and performs current limiting operation on the SVA based on the output reference current. By monitoring the capacitance value of the electrolytic capacitor in real time and limiting the output current based on the capacitance decay, the system ensures that the SVA can still be used with limited capacitance even when the electrolytic capacitor decays, thus guaranteeing safe operation and extending the service life of the SVA. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0058] Figure 1 This is a flowchart of the current limiting method for a static var generator based on capacitance parameters provided by the present invention.

[0059] Figure 2 It is the circuit structure of a static var generator.

[0060] Figure 3 This is a structural diagram of the current limiting system of the static var generator based on capacitance parameters provided by the present invention. Detailed Implementation

[0061] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and not for limiting the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all structures. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0062] The terms "comprising" and "having," and any variations thereof, used in this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] Please see Figure 1 As shown, this invention provides a current limiting method for a static var generator based on capacitance parameters, the method comprising the following steps:

[0065] S100 collects the power parameters of the AC and DC sides of the static var generator; based on the power parameters, it determines the current parameters of the DC side.

[0066] Furthermore, in S100, the power parameters of the AC and DC sides of the static var generator are collected; based on the power parameters, the current parameters of the DC side are determined, specifically:

[0067] The instantaneous voltages of the three phases A, B, and C on the AC side of the static var generator are collected. , , and instantaneous current , , ;

[0068] Collect the DC voltage at a sampling point on the DC side of the static var generator. and the DC voltage at the previous sampling point on the DC side. ;

[0069] Using the following formula, determine the DC current at a specific sampling point on the DC side based on the instantaneous voltage, instantaneous current, and DC voltage at a specific sampling point. ,

[0070] .

[0071] Please see Figure 2 A static var generator (SVA) consists of an AC side and a DC side. In actual operation, it uses a sampling frequency... (Preferred to be 10kHz) Synchronously acquire the instantaneous voltages of phases A, B, and C at point X on the AC side. , , and instantaneous current , , And the DC voltage at a certain sampling point on the DC side. and the DC voltage at the previous sampling point on the DC side. During the data acquisition process, it is required to ensure that the sampling time deviation between each sampling point is less than 5μs in order to reduce the impact of phase difference on instantaneous power calculation, thereby reducing the instantaneous power calculation error to less than 0.5%.

[0072] Based on the principle of instantaneous energy conservation, it is assumed that the input energy on the AC side is equal to the output energy on the DC side, that is, the DC current on the DC side is satisfied. .

[0073] S200: Based on the current parameters and the DC-side power parameters, a discrete-time equation is established; based on the discrete-time equation, the DC-side capacitance parameters are obtained.

[0074] Furthermore, in S200, a discrete-time equation is established based on the current parameters and the DC-side power parameters; based on the discrete-time equation, the DC-side capacitance parameters are obtained, specifically:

[0075] Using the following formula, a discrete-time equation is established based on the DC current, the DC voltage at a certain sampling point, and the DC voltage at the previous sampling point.

[0076]

[0077] In the above formula, This represents the differential result of the capacitance on the DC side. Indicates the sampling frequency;

[0078] The DC-side capacitance value is obtained by performing a first-order exponential smoothing filter on the differential result of the DC-side capacitance.

[0079] In practical applications, discrete-time equations are established by utilizing the charging and discharging characteristics of capacitors. The discrete-time equation described above is a differential element. Considering that the differential element will introduce a large amount of high-frequency interference signals, a low-pass filter is needed to filter out the high-frequency interference signals. A first-order exponential smoothing filter is preferred. This applies to the differential result of the capacitance. Filtering is performed to obtain the DC-side capacitance value. ,in This represents the capacitance differential result corresponding to the previous sampling point on the DC side. This represents the first-order filter coefficients, and their preferred value is 1*10. -5 .

[0080] S300 determines the current limiting ratio based on the DC side capacitor parameters; and determines the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated.

[0081] Furthermore, in the S300, the current limiting ratio is determined based on the capacitor parameters on the DC side; based on the current limiting ratio and the current state of the load to be compensated, the output reference current of the static var generator is determined, specifically as follows:

[0082] Using the formula below, determine the current limiting ratio based on the DC-side capacitance value.

[0083]

[0084] In the above formula, Indicates the rate limiting ratio. This indicates the nominal capacitance of the DC-side capacitor. This indicates the capacitance value on the DC side;

[0085] The current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components The output reference current of the static var generator is determined using the following formula.

[0086]

[0087] In the above formula, This indicates the output reference current.

[0088] In practical applications, based on the symmetrical component valve, the current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components Due to the positive order components The impact on the DC-side current is relatively small, therefore the current limiting mainly targets the negative sequence component. and zero-order components The nominal capacitance of the DC-side capacitor is set to... The rate limiting ratio This is used to determine the output reference current of the static var generator. This provides a basis for subsequent current limiting operations.

[0089] S400 performs current limiting operation on the static var generator based on the output reference current.

[0090] Furthermore, in the S400, the static var generator is current-limited based on the output reference current, specifically as follows:

[0091] The actual output current of the static var generator is collected and compared with the output reference current. If the actual output current exceeds the output reference current, the static var generator is current-limited; otherwise, the static var generator is not current-limited.

[0092] By using the above method and taking the above-mentioned output reference current as a benchmark, the static var generator is subjected to current limiting operation to accurately avoid excessive output current, thereby ensuring that it can still be used with limited capacity even when the electrolytic capacitor decays, ensuring the safe operation of the static var generator and extending its service life.

[0093] Please see Figure 3 As shown, this invention provides a current limiting system for a static var generator based on capacitance parameters. The system includes the following modules:

[0094] The power parameter acquisition module is used to acquire the power parameters of the AC and DC sides of the static var generator.

[0095] The current parameter determination module is used to determine the DC side current parameters based on the power parameters.

[0096] The capacitor parameter determination module is used to establish a discrete-time equation based on the current parameters and the DC-side power parameters; and to obtain the DC-side capacitor parameters based on the discrete-time equation.

[0097] The current limiting ratio determination module is used to determine the current limiting ratio based on the capacitor parameters on the DC side.

[0098] The output reference current determination module is used to determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated.

[0099] The current limiting operation module is used to limit the current of the static var generator based on the output reference current.

[0100] Furthermore, the power parameter acquisition module is used to acquire the power parameters of the AC and DC sides of the static var generator, including:

[0101] The instantaneous voltages of the three phases A, B, and C on the AC side of the static var generator are collected. , , and instantaneous current , , ;

[0102] Collect the DC voltage at a sampling point on the DC side of the static var generator. and the DC voltage at the previous sampling point on the DC side. ;

[0103] The current parameter determination module is used to determine the DC side current parameters based on the power parameters, including:

[0104] Using the following formula, determine the DC current at a specific sampling point on the DC side based on the instantaneous voltage, instantaneous current, and DC voltage at a specific sampling point. ,

[0105] .

[0106] Furthermore, the capacitor parameter determination module is used to establish a discrete-time equation based on the current parameters and the DC-side power parameters; based on the discrete-time equation, the DC-side capacitor parameters are obtained, including:

[0107] Using the following formula, a discrete-time equation is established based on the DC current, the DC voltage at a certain sampling point, and the DC voltage at the previous sampling point.

[0108]

[0109] In the above formula, This represents the differential result of the capacitance on the DC side. Indicates the sampling frequency;

[0110] The DC-side capacitance value is obtained by performing a first-order exponential smoothing filter on the differential result of the DC-side capacitance.

[0111] Furthermore, the current limiting ratio determination module is used to determine the current limiting ratio based on the capacitor parameters on the DC side, including:

[0112] Using the formula below, determine the current limiting ratio based on the DC-side capacitance value.

[0113]

[0114] In the above formula, Indicates the rate limiting ratio. This indicates the nominal capacitance of the DC-side capacitor. This indicates the capacitance value on the DC side;

[0115] The output reference current determination module is used to determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated, including:

[0116] The current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components The output reference current of the static var generator is determined using the following formula.

[0117]

[0118] In the above formula, This indicates the output reference current.

[0119] Furthermore, the current limiting operation module is used to perform current limiting operation on the static var generator based on the output reference current, including:

[0120] The actual output current of the static var generator is collected and compared with the output reference current. If the actual output current exceeds the output reference current, the static var generator is current-limited; otherwise, the static var generator is not current-limited.

[0121] The current limiting system of the static var generator based on capacitance parameters of the present invention has the same operation and effect as the current limiting method of the static var generator based on capacitance parameters described above, and the current limiting system of the static var generator based on capacitance parameters will not be described again here.

[0122] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of a necessary general-purpose hardware platform, or by a combination of hardware and software. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a computer product. The present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Other embodiments may also be used. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A current limiting method for a static var generator based on capacitance parameters, characterized in that, The method includes the following steps: S100: Collect the power parameters of the AC side and DC side of the static var generator; determine the current parameters of the DC side based on the power parameters; S200: Based on the current parameters and the DC-side power parameters, establish a discrete-time equation; based on the discrete-time equation, obtain the DC-side capacitance parameters, specifically: Using the following formula, a discrete-time equation is established based on the DC current, the DC voltage at a certain sampling point, and the DC voltage at the previous sampling point. ； In the above formula, This represents the differential result of the capacitance on the DC side. Indicates the sampling frequency. This represents the DC current at a specific sampling point on the DC side. This represents the DC voltage at a specific sampling point on the DC side. This represents the DC voltage at the previous sampling point on the DC side. The capacitance value on the DC side is obtained by performing a first-order exponential smoothing filter on the differential result of the DC side capacitance. S300: Determine the current limiting ratio based on the capacitor parameters on the DC side; determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated, specifically: Using the following formula, determine the current limiting ratio based on the capacitance value on the DC side. ； In the above formula, Indicates the rate limiting ratio. This indicates the nominal capacitance of the DC-side capacitor. This indicates the capacitance value on the DC side; The current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components The output reference current of the static var generator is determined using the following formula. + ； In the above formula, Indicates the output reference current; S400: Perform current limiting operation on the static var generator according to the output reference current.

2. The method according to claim 1, characterized in that, In S100, the power parameters of the AC and DC sides of the static var generator are collected; based on the power parameters, the current parameters of the DC side are determined, specifically as follows: The instantaneous voltages of the three phases A, B, and C on the AC side of the static var generator are collected. , , and instantaneous current , , ; Collect the DC voltage at a sampling point on the DC side of the static var generator. And the DC voltage at the previous sampling point on the DC side. ; Using the following formula, the DC current at a certain sampling point on the DC side is determined based on the instantaneous voltage, the instantaneous current, and the DC voltage at a certain sampling point. , 。 3. The method according to claim 2, characterized in that, In S400, based on the output reference current, a current limiting operation is performed on the static var generator, specifically as follows: The actual output current of the static var generator is collected and compared with the output reference current; if the actual output current exceeds the output reference current, a current limiting operation is performed on the static var generator. Otherwise, the current limiting operation is not performed on the static var generator.

4. A current limiting system for a static var generator based on capacitance parameters, characterized in that, The system includes the following modules: The power parameter acquisition module is used to acquire the power parameters of the AC and DC sides of the static var generator. A current parameter determination module is used to determine the current parameters on the DC side based on the power parameters. The capacitor parameter determination module is used to establish a discrete-time equation based on the current parameter and the DC side power parameter; Based on the discrete-time equation, the capacitance parameters on the DC side are obtained, including: Using the following formula, a discrete-time equation is established based on the DC current, the DC voltage at a certain sampling point, and the DC voltage at the previous sampling point. ； In the above formula, This represents the differential result of the capacitance on the DC side. Indicates the sampling frequency. This represents the DC current at a specific sampling point on the DC side. This represents the DC voltage at a specific sampling point on the DC side. This represents the DC voltage at the previous sampling point on the DC side. The capacitance value on the DC side is obtained by performing a first-order exponential smoothing filter on the differential result of the DC side capacitance. The current limiting ratio determination module is used to determine the current limiting ratio based on the capacitor parameters on the DC side, including: Using the following formula, determine the current limiting ratio based on the capacitance value on the DC side. ； In the above formula, Indicates the rate limiting ratio. This indicates the nominal capacitance of the DC-side capacitor. This indicates the capacitance value on the DC side; The output reference current determination module is used to determine the output reference current of the static var generator based on the current limiting ratio and the current state of the load to be compensated, including: The current of the load to be compensated is decomposed into positive sequence components. Negative order components Zero-order components The output reference current of the static var generator is determined using the following formula. + ； In the above formula, Indicates the output reference current; The current limiting operation module is used to perform current limiting operation on the static var generator based on the output reference current.

5. The system according to claim 4, characterized in that, The power parameter acquisition module is used to acquire the power parameters of the AC and DC sides of the static var generator, including: The instantaneous voltages of the three phases A, B, and C on the AC side of the static var generator are collected. , , and instantaneous current , , ; Collect the DC voltage at a sampling point on the DC side of the static var generator. And the DC voltage at the previous sampling point on the DC side. ; The current parameter determination module is used to determine the DC side current parameters based on the power parameters, including: Using the following formula, the DC current at a certain sampling point on the DC side is determined based on the instantaneous voltage, the instantaneous current, and the DC voltage at a certain sampling point. , 。 6. The system according to claim 5, characterized in that, The current limiting operation module is used to perform current limiting operation on the static var generator according to the output reference current, including: The actual output current of the static var generator is collected and compared with the output reference current. If the actual output current exceeds the output reference current, a current limiting operation is performed on the static var generator; otherwise, no current limiting operation is performed on the static var generator.

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