System integrating electric energy quality treatment and inrush current suppression

Abstract

A system integrating electric energy quality control and inrush current suppression comprises a master control system, an energy storage module, an inversion module and an output circuit breaker, the output end of the energy storage module is connected with the input end of the inversion module, and the output end of the inversion module is connected with one end of the output circuit breaker. The other end of the output circuit breaker is connected with the low-voltage side of the main transformer and one end of a load side circuit breaker, the other end of the load side circuit breaker is connected with a load system, and the high-voltage side of the main transformer is connected with one end of a wire inlet side circuit breaker; the other end of the wire inlet side circuit breaker is connected with a power grid system, a voltage signal input end of the main control system and a current signal input end of the main control system, and a control signal end of the main control system is connected with a control end of the inversion module. According to the design, excitation inrush current can be suppressed during the switching-on period of the main transformer, and the electric energy quality of a power distribution system is adjusted after switching-on.

Description

Technical Field

[0001] The utility model relates to the field of power equipment, in particular to a system integrating power quality governance and inrush current suppression. Background Technique

[0002] When the main transformer of the power system is switched on without load or re-energized after the external fault is removed, due to the non-linear characteristics of the iron core material of the transformer itself and the accompanying flux saturation characteristics, an impact excitation inrush current with an amplitude that can reach 6 to 8 times the rated current of the transformer will be generated at the moment of switching on without load. Especially in modern times, in order to improve the efficiency of large-capacity transformers, the designed working magnetic flux density is very high, and the inrush current situation is more serious.

[0003] The inrush current will not only shorten the service life of the high-voltage switch used for switching the main transformer, but also may cause the over-current protection relay on the primary side of the transformer to operate, resulting in the inability of the transformer to be switched on; the excessive inrush current also carries a large amount of harmonics, and the harmonic components may damage the power electronic devices, causing the power electronic devices to be damaged and out of control; the inrush current will also generate resonant over-voltage, making other electrical equipment connected near the transformer unable to work normally, and may form a circulating current with other main transformers in the system, causing the protection of other normally working main transformers to trip, seriously affecting the power supply safety. At the same time, the existing equipment for suppressing inrush current is only used when the transformer is switched on, and its usage frequency is very low, so the equipment cannot be fully utilized and the economy is low. Therefore, there is a need for a system integrating power quality governance and inrush current suppression that can make full use of the existing transformers and related switch equipment in the substation to suppress the inrush current during system switching on and manage the power quality during system operation. Summary of the Invention

[0004] The purpose of the utility model is to overcome the problem of the inrush current generated during the switching on of the transformer in the prior art, and the high cost and low utilization frequency of the existing inrush current suppression equipment, and provide a system integrating power quality governance and inrush current suppression that can make full use of the existing transformers and related switch equipment in the substation to suppress the inrush current during system switching on at low cost, and realize power quality management during system operation.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A system integrating power quality governance and inrush current suppression, the system integrating power quality governance and inrush current suppression includes: a main control system, an energy storage module, an inverter module, and an output circuit breaker;

[0007] The output terminal of the energy storage module is connected to the input terminal of the inverter module. The output terminal of the inverter module is connected to one end of the output circuit breaker. The other end of the output circuit breaker is connected to the low-voltage side of the main transformer and one end of the load-side circuit breaker. The other end of the load-side circuit breaker is connected to the load system. The high-voltage side of the main transformer is connected to one end of the incoming-line circuit breaker. The other end of the incoming-line circuit breaker is connected to the power grid system, the voltage signal input terminal of the main control system, and the current signal input terminal of the main control system. The control signal output terminal of the main control system is connected to the control terminal of the inverter module.

[0008] A first switch, a second switch, and a charging resistor are arranged between the inverter module and the output circuit breaker. The output terminal of the inverter module is connected to one end of the first switch and one end of the second switch. The other end of the second switch is connected to one end of the charging resistor. The other end of the charging resistor is connected to the other end of the first switch and one end of the output circuit breaker;

[0009] The switch control signal output terminal of the main control system is connected to the control coil of the first switch and the control coil of the second switch.

[0010] The system for integrated power quality governance and inrush current suppression further includes an AC fuse FU. One end of the AC fuse is connected to the first switch and the charging resistor, and the other end of the AC fuse is connected to the output circuit breaker.

[0011] The inverter module includes an inverter circuit and a DC capacitor. The positive pole of the DC side of the inverter circuit is simultaneously connected to the positive pole of the output terminal of the energy storage module and one end of the DC capacitor. The negative pole of the DC side of the inverter circuit is simultaneously connected to the negative pole of the output terminal of the energy storage module and the other end of the DC capacitor. The AC side of the inverter circuit is connected to one end of the first switch and one end of the second switch;

[0012] The PWM control signal output terminal of the main control system is connected to the drive circuit of the inverter circuit.

[0013] The inverter circuit is a split-phase three-bridge-arm structure, a three-phase four-bridge-arm structure, or a diode neutral-point clamped three-level structure.

[0014] The inverter module further includes an LC filter circuit. The LC filter circuit includes an inductor and a filter capacitor. One end of the inductor is connected to the AC side of the inverter circuit. The other end of the AC side of the inverter circuit is connected to one end of the filter capacitor, one end of the first switch, and one end of the second switch. The other end of the filter capacitor is grounded.

[0015] The voltage signal input terminal of the main control system is connected to the power grid system through a voltage transformer;

[0016] The current signal input terminal of the main control system is connected to the power grid system through a current transformer.

[0017] The energy storage module is a battery and / or a supercapacitor.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. In the system for integrated power quality management and inrush current suppression of the present utility model, the energy storage module provides a DC power supply for the inverter module. The control end of the inverter module is connected to the control signal end of the main control system, and the output of the inverter module can be controlled through the main control system. At the same time, a voltage signal input interface and a current signal input interface are provided on the main control system. The voltage signal input interface is used to receive the voltage signal of the high-voltage power grid system, and the current signal input interface is used to receive the current signal of the transformer and its low-voltage side. When the main transformer is switched on, the main control system gradually increases the output voltage of the system from zero volts according to the received voltage signal of the high-voltage power grid system, adjusts the output of the inverter module until the amplitude and phase of the voltage on the high-voltage side of the main transformer are the same as those of the high-voltage power grid system, and then closes the incoming line side circuit breaker, so that inrush current-free switching on of the main transformer can be achieved, thereby prolonging the service life of the main transformer and high-voltage switch and ensuring the safe operation of other relevant power equipment. Moreover, after the switching on is completed, the system switches to the power quality management operation mode. At this time, the main control system controls the operation of the inverter module according to the voltage and current on the high-voltage side of the main transformer, charges the energy storage module while compensating for the reactive power or harmonics of the transformer and the low-voltage distribution system, and realizes the power quality management function of the distribution system, improving the utilization rate of the equipment. Therefore, this design can be used as the excitation input during the switching on of the main transformer. After the switching on of the main transformer is completed, the power quality management device is used for the power quality management of the distribution system. On the premise of low cost, it can simultaneously achieve inrush current suppression during the switching on of the main transformer and power quality management of the load system, prolong the service life of the main transformer and high-voltage switch, improve the utilization rate of existing equipment, and has a wide range of applications.

[0020] 2. In the system of the present utility model for integrated power quality governance and inrush current suppression, a first switch, a second switch, and a charging resistor are arranged between the inverter module and the output circuit breaker. One end of the output terminal of the inverter module is connected to one end of the first switch and one end of the second switch. The other end of the second switch is connected to one end of the charging resistor. The other end of the charging resistor is connected to the other end of the first switch and one end of the output circuit breaker. The switch control signal output terminal of the main control system is connected to the control coil of the first switch and the control coil of the second switch. The main control system controls the opening and closing of the first switch and the second switch. A charging circuit composed of a charging resistor and a charging switch is arranged between the inverter module and the output circuit breaker. The charging circuit is used for the initial charging of the DC voltage in the low-voltage system. During the process of the initial charging of the DC voltage of the energy storage module: first, keep the first switch in the open state and close the second switch, and perform standby charging through the charging resistor. When the DC voltage of the energy storage module reaches the rated value, open the second switch and close the first switch. By setting the charging circuit, the charging current and voltage peak value can be effectively limited, the electrical components in the circuit can be protected, and the safety and stability of the system can be ensured. Therefore, in this design, a charging circuit composed of a charging resistor and a charging switch is arranged between the inverter module and the output circuit breaker, which effectively limits the charging current and voltage peak value, protects the electrical components in the circuit, and ensures the safety and stability of the system.

[0021] 3. In the system of the present utility model for integrated power quality governance and inrush current suppression, an LC filter circuit is arranged on the AC output side of the inverter circuit. The LC filter circuit filters the AC voltage output by the inverter circuit into a sine wave that meets the national standard. At the same time, an AC fuse is also arranged in the system to ensure the safe and stable operation of the system. Therefore, the system of the present design for integrated power quality governance and inrush current suppression can output an AC sine wave safely and stably, with high reliability.

[0022] 4. In the system of the present utility model for integrated power quality governance and inrush current suppression, the output terminal of the system is connected to the low-voltage side of the main transformer and one end of the load-side circuit breaker. The other end of the load-side circuit breaker is connected to the load system. The high-voltage side of the main transformer is connected to one end of the incoming-line circuit breaker. The other end of the incoming-line circuit breaker is connected to the power grid system, the voltage signal input terminal of the main control system, and the current signal input terminal of the main control system. The PWM control signal terminal of the main control system is connected to the drive circuit of the inverter module. The connection method of the integrated power quality governance and inrush current suppression system is simple and easy to connect to the power supply system, with high practicability. Therefore, the connection method of the integrated power quality governance and inrush current suppression system in this design is simple and easy to connect to the power supply system, with high practicability. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the system of the present utility model for integrated power quality governance and inrush current suppression.

[0024] Figure 2 This is the operation flowchart of a system for integrated power quality governance and inrush current suppression of the present utility model.

[0025] In the figure: main control system 1, energy storage module 2, inverter module 3, inverter circuit 31, DC capacitor C1, main transformer T, output circuit breaker K1, load-side circuit breaker K2, incoming-side circuit breaker K3, first switch K4, second switch K5, charging resistor R, AC fuse FU, inductor L, filter capacitor C2, voltage transformer PT, current transformer CT. Specific implementation manner

[0026] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] See Figures 1 to 2 , a system for integrated power quality governance and inrush current suppression, which can be mainly used in switchyards or substations to suppress the inrush current during the closing of the main transformer and achieve power quality governance on the distribution side after the closing is completed.

[0028] The system for integrated power quality governance and inrush current suppression includes: main control system 1, energy storage module 2, inverter module 3. Among them, the energy storage module 2 is used to provide DC power for the system, the output end of the energy storage module 2 is connected to the input end of the inverter module 3, the output end of the inverter module 3 is connected to one end of the output circuit breaker K1, the other end of the output circuit breaker K1 is connected to the low-voltage side of the main transformer T and one end of the load-side circuit breaker K2, the other end of the load-side circuit breaker K2 is connected to the load system, the high-voltage side of the main transformer T is connected to one end of the incoming-side circuit breaker K3, and the other end of the incoming-side circuit breaker K3 is connected to the power grid system, the voltage signal input end of the main control system 1, and the current signal input end of the main control system 1 to achieve the function of AC sampling. At the same time, the control signal end of the main control system 1 is connected to the control end of the inverter module 3 to control the operation of the inverter module 3. Among them, the main control system 1 includes modules such as a core processor and a memory. The main control system 1 can receive control instructions input by an operator through a human-computer interaction device and control the inverter module 3 according to the control instructions. The functions of system input and output can be realized through the main control system 1.

[0029] A first switch K4, a second switch K5, and a charging resistor R are arranged between the inverter module 3 and the output circuit breaker K1. The output end of the inverter module 3 is connected to one end of the first switch K4 and one end of the second switch K5. The other end of the second switch K5 is connected to one end of the charging resistor R. The other end of the charging resistor R is connected to the other end of the first switch K4 and one end of the output circuit breaker K1.

[0030] The switch control signal output terminal of the main control system 1 is connected to the control coils of the first switch K4 and the second switch K5 to control the opening and closing of the first switch K4 and the second switch K5.

[0031] A charging circuit composed of a charging resistor R, the first switch K4, and the second switch K5 is provided between the inverter module 3 and the output circuit breaker K1. The charging circuit is used for the low-voltage system to be powered on. During the process of charging the DC voltage of the energy storage module 2: First, keep the first switch K4 in the open state and close the second switch K5, and perform standby charging through the charging resistor R. Subsequently, open the second switch K5 and close the first switch K4. By setting the charging circuit, the charging current and voltage peak value can be effectively limited, protecting the electrical components in the circuit.

[0032] The main control system calculates the reactive power of the main transformer T and the load-side system based on the voltage and current values of the grid-side system, and sends a PWM control signal to control the operation of the inverter module 3, so that the DC side of the inverter module 3 and the positive and negative poles of the energy storage module 2 maintain a certain voltage, compensating the reactive power of the main transformer T and the load-side system while charging the energy storage module 2, and further improving the energy utilization rate.

[0033] In this embodiment, the main control system 1 receives the control instructions input by the operator through the human-machine interaction device. Specifically, the main control system 1 is connected to the human-machine interaction device. The human-machine interaction device is used for parameter setting, protection setting, control instruction and status display. The human-machine interaction device includes an input module and a display module. The display module is used to display the status and parameters of the integrated power quality governance and inrush current suppression system, including the opening and closing status of the output circuit breaker K1, the first switch K4, and the second switch K5, as well as the amplitude and phase of the output voltage of the integrated power quality governance and inrush current suppression system. The input module is used to respond to the input operation of the operator and send corresponding control instructions to the main control system 1 according to the input operation of the operator. The main control system 1 controls the opening and closing of the output circuit breaker K1, the first switch K4, and the second switch K5 according to the control instructions, and regulates the operation of the inverter module 3.

[0034] The integrated power quality governance and inrush current suppression system further includes an AC fuse FU. One end of the AC fuse FU is connected to the first switch K4 and the charging resistor R, and the other end of the AC fuse FU is connected to the output circuit breaker K1. The AC fuse FU can avoid excessive system current and play a protective role for the system.

[0035] The inverter module 3 includes an inverter circuit 31 and a DC capacitor C1. The positive pole of the DC side of the inverter circuit 31 is connected to the positive pole of the output terminal of the energy storage module 2 and one end of the DC capacitor C1 at the same time. The negative pole of the DC side of the inverter circuit 31 is connected to the negative pole of the output terminal of the energy storage module 2 and the other end of the DC capacitor C1 at the same time. The AC side of the inverter circuit 31 is connected to one end of the first switch K4 and one end of the second switch K5.

[0036] The inverter circuit 31 includes multiple groups of high-power power electronic devices. The drive circuit of the inverter circuit 31 is connected to the PWM control signal terminal of the main control system 1. The main control system 1 sends control commands to the gates of the high-power power electronic devices in the inverter module 3 through the PWM drive circuit, controls the conduction and cut-off of the high-power power electronic devices, and thus can control the operation of the inverter module 3 and adjust the output of the inverter module 3.

[0037] The inverter circuit 31 is a split-phase three-leg structure, a three-phase four-leg structure, or a diode neutral point clamped three-level structure.

[0038] The inverter module 3 further includes an LC filter circuit. The LC filter circuit includes an inductor L and a filter capacitor C2. One end of the inductor L is connected to the AC side of the inverter circuit 31. The other end of the AC side of the inverter circuit 31 is connected to one end of the filter capacitor C2, one end of the first switch K4, and one end of the second switch K5. The other end of the filter capacitor C2 is grounded. The LC filter circuit can ensure that the output distortion rate of the system conforms to the AC sine wave of the national standard.

[0039] The voltage signal input terminal of the main control system 1 is connected to the power grid system through a voltage transformer PT, and the current signal input terminal of the main control system 1 is connected to the power grid system through a current transformer CT.

[0040] In this design of a system integrating power quality governance and inrush current suppression, the adjustable output characteristic of a class of electronic devices, namely power quality governance equipment, is utilized. It is used as the excitation input during the no-inrush closing process. After the closing is completed, it is then used for power quality management of the distribution network, realizing the multi-functional use of one device and saving equipment costs. At the same time, in this design, while performing power quality management of the distribution network, the energy storage module 2 is charged, and the energy utilization rate is high.

[0041] The energy storage module is a rechargeable battery and / or a supercapacitor.

[0042] The principle of the present utility model is described as follows:

[0043] The operation flow chart of the system integrating power quality governance and inrush current suppression is as Figure 2As shown, before closing the main transformer T, ensure that the output circuit breaker K1, the first switch K4, and the second switch K5 are all in the open state, and the incoming line side circuit breaker K3 is in the open state.

[0044] When performing the closing operation of the main transformer T, the energy storage module 2 outputs DC voltage. At this time, keep the first switch K4 in the open state, close the second switch K5 and the output circuit breaker K1, and after judging that the battery DC voltage meets the requirements, open the second switch K5 and close the first switch K4, and the system is powered on.

[0045] Subsequently, the main control system 1 controls the operation of the inverter module 3, and the system integrating power quality management and inrush current suppression outputs AC voltage to the load side of the main transformer T. In this process, the main control system 1 controls the operation of the inverter module 3 based on the voltage signal received from the high-voltage power grid system, as well as the turns ratio and wiring method of the main transformer, so that the output voltage of the system integrating power quality management and inrush current suppression gradually rises from zero volts until the amplitude and phase of the voltage on the high-voltage side of the main transformer T are the same as the amplitude and phase of the high-voltage power grid system.

[0046] After confirming that the amplitude and phase of the voltage on the high-voltage side of the main transformer T are the same as the amplitude and phase of the high-voltage power grid system, close the incoming line side circuit breaker K3, and the inrush current-free closing of the main transformer can be achieved, which improves the service life of the main transformer and high-voltage switches and ensures the safe operation of other related power equipment.

[0047] After the incoming line side circuit breaker K3 is closed, the main transformer T operates with a load, and the main control system 1 switches to the power quality management operation mode. At this time, the main control system 1 compensates for the reactive power or harmonics of the main transformer T and the low-voltage power distribution system according to the voltage and current on the high-voltage side of the main transformer, realizes the power quality management function, and continuously charges the energy storage module 2 to wait for the next inrush current-free closing process.

[0048] Embodiment 1:

[0049] A system integrating power quality management and inrush current suppression, the system integrating power quality management and inrush current suppression includes: a main control system 1, an energy storage module 2, an inverter module 3, and an output circuit breaker K1; the output end of the energy storage module 2 is connected to the input end of the inverter module 3, the output end of the inverter module 3 is connected to one end of the output circuit breaker K1, the other end of the output circuit breaker K1 is connected to the low-voltage side of the main transformer T and one end of the load-side circuit breaker K2, the other end of the load-side circuit breaker K2 is connected to the load system, the high-voltage side of the main transformer T is connected to one end of the incoming line-side circuit breaker K3, the other end of the incoming line-side circuit breaker K3 is connected to the power grid system, the voltage signal input end of the main control system 1, and the current signal input end of the main control system 1, the control signal end of the main control system 1 is connected to the control end of the inverter module 3; a first switch K4, a second switch K5, and a charging resistor R are arranged between the inverter module 3 and the output circuit breaker K1, the output end of the inverter module 3 is connected to one end of the first switch K4 and one end of the second switch K5, the other end of the second switch K5 is connected to one end of the charging resistor R, the other end of the charging resistor R is connected to the other end of the first switch K4 and one end of the output circuit breaker K1; the switch control signal output end of the main control system 1 is connected to the control coil of the first switch K4 and the control coil of the second switch K5; the system integrating power quality management and inrush current suppression further includes an AC fuse FU, one end of the AC fuse FU is connected to the first switch K4 and the charging resistor R, and the other end of the AC fuse FU is connected to the output circuit breaker K1; the inverter module 3 includes an inverter circuit 31 and a DC capacitor C1, the positive pole of the DC side of the inverter circuit 31 is simultaneously connected to the positive pole of the output end of the energy storage module 2 and one end of the DC capacitor C1, the negative pole of the DC side of the inverter circuit 31 is simultaneously connected to the negative pole of the output end of the energy storage module 2 and the other end of the DC capacitor C1, the AC side of the inverter circuit 31 is connected to one end of the first switch K4 and one end of the second switch K5; the PWM control signal end of the main control system 1 is connected to the drive circuit of the inverter circuit 31; the inverter module 3 further includes an LC filter circuit, the LC filter circuit includes an inductor L and a filter capacitor C2, one end of the inductor L is connected to the AC side of the inverter circuit 31, the other end of the AC side of the inverter circuit 31 is connected to one end of the filter capacitor C2, one end of the first switch K4, and one end of the second switch K5, and the other end of the filter capacitor C2 is grounded.

[0050] Embodiment 2:

[0051] Embodiment 2 is basically the same as Embodiment 1, and the difference lies in:

[0052] The inverter circuit 31 is a split-phase three-bridge arm structure, a three-phase four-bridge arm structure, or a diode neutral point clamped three-level structure; the energy storage module 2 is a battery and / or a supercapacitor.

[0053] Embodiment 3:

[0054] Embodiment 3 is basically the same as Embodiment 2, and the difference lies in that:

[0055] The voltage signal input end of the main control system 1 is connected to the power grid system through a voltage transformer PT; the current signal input end of the main control system 1 is connected to the power grid system through a current transformer CT.

[0056] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. Any equivalent modification or change made by those of ordinary skill in the art according to the content disclosed by the present invention shall be included in the protection scope recorded in the claims.

Claims

1. An integrated system for power quality governance and inrush current suppression, characterized in that: The integrated system for power quality governance and inrush current suppression includes: a main control system (1), an energy storage module (2), an inverter module (3), and an output circuit breaker (K1); The output end of the energy storage module (2) is connected to the input end of the inverter module (3), the output end of the inverter module (3) is connected to one end of the output circuit breaker (K1), the other end of the output circuit breaker (K1) is connected to the low-voltage side of the main transformer (T) and one end of the load-side circuit breaker (K2), the other end of the load-side circuit breaker (K2) is connected to the load system, the high-voltage side of the main transformer (T) is connected to one end of the incoming-line circuit breaker (K3), and the other end of the incoming-line circuit breaker (K3) is connected to the power grid system, the voltage signal input end of the main control system (1), and the current signal input end of the main control system (1). The control signal output end of the main control system (1) is connected to the control end of the inverter module (3).

2. The integrated system for power quality governance and inrush current suppression according to claim 1, characterized in that: A first switch (K4), a second switch (K5), and a charging resistor (R) are arranged between the inverter module (3) and the output circuit breaker (K1). The output end of the inverter module (3) is connected to one end of the first switch (K4) and one end of the second switch (K5). The other end of the second switch (K5) is connected to one end of the charging resistor (R). The other end of the charging resistor (R) is connected to the other end of the first switch (K4) and one end of the output circuit breaker (K1); The switch control signal output end of the main control system (1) is connected to the control coil of the first switch (K4) and the control coil of the second switch (K5).

3. The integrated system for power quality governance and inrush current suppression according to claim 2, characterized in that: The integrated system for power quality governance and inrush current suppression further includes an AC fuse (FU). One end of the AC fuse (FU) is connected to the first switch (K4) and the charging resistor (R), and the other end of the AC fuse (FU) is connected to the output circuit breaker (K1).

4. The integrated system for power quality governance and inrush current suppression according to claim 2, characterized in that: The inverter module (3) includes an inverter circuit (31) and a DC capacitor (C1). The positive pole of the DC side of the inverter circuit (31) is simultaneously connected to the positive output end of the energy storage module (2) and one end of the DC capacitor (C1). The negative pole of the DC side of the inverter circuit (31) is simultaneously connected to the negative output end of the energy storage module (2) and the other end of the DC capacitor (C1). The AC side of the inverter circuit (31) is connected to one end of the first switch (K4) and one end of the second switch (K5); The PWM control signal output end of the main control system (1) is connected to the drive circuit of the inverter circuit (31).

5. The integrated system for power quality governance and inrush current suppression according to claim 4, characterized in that: The inverter circuit (31) is a split-phase three-bridge arm structure, a three-phase four-bridge arm structure, or a diode neutral-point clamped three-level structure.

6. The system for integrated power quality governance and inrush current suppression according to claim 2, characterized in that: The inverter module (3) further includes an LC filter circuit. The LC filter circuit includes an inductor (L) and a filter capacitor (C2). One end of the inductor (L) is connected to the AC side of the inverter circuit (31). The other end of the AC side of the inverter circuit (31) is connected to one end of the filter capacitor (C2), one end of the first switch (K4), and one end of the second switch (K5). The other end of the filter capacitor (C2) is grounded.

7. The system for integrated power quality governance and inrush current suppression according to claim 1, characterized in that: The voltage signal input terminal of the main control system (1) is connected to the power grid system through a voltage transformer (PT); The current signal input terminal of the main control system (1) is connected to the power grid system through a current transformer (CT).

8. The system for integrated power quality governance and inrush current suppression according to claim 1, characterized in that: The energy storage module (2) is a battery and / or a super capacitor.

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