Voltage stabilization type electric energy quality comprehensive treatment device

Abstract

The invention relates to the technical field of high-voltage compensation, and provides a voltage stabilization type electric energy quality comprehensive treatment device. The TBB static reactive power compensation device comprises at least one switching reactance capacitor bank. Wherein the reactance capacitor bank comprises a vacuum contactor; the SVG dynamic reactive power compensation device comprises an SVG compensation device, and the SVG compensation device is electrically connected with a transformer through an isolation switch fuse group. Wherein the transformer is electrically connected with the switched reactance capacitor bank. The disadvantages of a traditional TBB are avoided through the TBB + SVG high-voltage reactive power dynamic hybrid compensation device, and the advantages of the SVG are added; sVG dynamic compensation is high in response speed and can compensate loads with fast reactive power change, and TBB static reactive power compensation is used for compensating stable loads with infrequent reactive power change of the system; fine adjustment can be achieved through combined compensation of the two, compensation precision is high, and the compensation effect is good.

Description

Technical Field

[0001] The present invention relates to the field of high voltage compensation, and in particular to a voltage-stabilizing type comprehensive power quality management device. Background Art

[0002] Due to the rapid development of renewable energy in various regions, the traditional TBB high-voltage reactive power compensation device can no longer meet the new reactive power compensation needs brought about by the grid connection of photovoltaic power generation. Only a combination of dynamic and static devices can meet the compensation requirements.

[0003] However, in the prior art, the TBB high-voltage reactive power compensation device can only be switched in fixed and grouped manners, with a large step difference. When the load fluctuates rapidly, the switching speed cannot keep up, and the compensation effect is relatively poor. Summary of the invention

[0004] The present invention proposes a voltage-stabilizing power quality comprehensive management device, which is used to solve the problem that the TBB high-voltage reactive power compensation device can only be switched in fixed and grouped positions, has a large step difference, cannot keep up with the switching speed when the load fluctuates rapidly, and has a relatively poor compensation effect.

[0005] The present invention proposes a voltage-stabilizing type comprehensive power quality control device, comprising:

[0006] The TBB static reactive power compensation device comprises at least one switching reactance capacitor group; wherein the reactance capacitor group comprises a vacuum contactor;

[0007] The SVG dynamic reactive power compensation device comprises an SVG compensation device SVG, wherein the SVG compensation device SVG is electrically connected to a transformer T through an isolating switch fuse group QSA; wherein the transformer T is electrically connected to a switching reactance capacitor group.

[0008] As an embodiment of the present invention, the switching reactance capacitor bank includes:

[0009] A current transformer TA and a series reactor L connected in series with the vacuum contactor;

[0010] The series reactor L is grounded through a zinc oxide lightning arrester FV, and the series reactor L is also connected to a parallel capacitor C; wherein the series fuse and the parallel capacitor are connected in parallel with a discharge coil TV.

[0011] As an embodiment of the present invention, the TBB static reactive power compensation device and the SVG dynamic reactive power compensation device are both connected to the high-voltage bus through a series-connected isolating switch QS, a capacitor transformer group TA and a normally closed switch KA; wherein the capacitor transformer group TA is not less than one group.

[0012] As an embodiment of the present invention, the TBB static reactive power compensation device is used to receive a first reactive power signal, and compensate for a base load when the reactive power signal is in a preset power range.

[0013] As an embodiment of the present invention, the SVG dynamic reactive power compensation device is used to receive a second reactive power signal, and when the second reactive power signal exceeds a preset power range, determine the load change rate and track the change rate, and track and compensate the dynamic load according to the change rate tracking result.

[0014] As an embodiment of the present invention, the TBB static reactive power compensation device and the SVG dynamic reactive power compensation device are further connected to a decision controller, and the decision controller is configured with the following decision steps:

[0015] Calculating a first capacitor voltage average value of the load and a second capacitor voltage average value of the high-voltage bus output voltage respectively according to the first reactive power signal and the second reactive power signal;

[0016] Inputting a preset voltage reference value and an average value of the second capacitor voltage into a voltage loop controller to determine a first compensation voltage;

[0017] Combining the first compensation voltage and the circulating current value to determine a first relationship coefficient between the modulation wave displacement and the modulation ratio;

[0018] Inputting the average value of the first capacitor voltage into the voltage balancing controller to perform voltage balancing calculation and determine the carrier adjustment coefficient;

[0019] According to the carrier adjustment coefficient and the first relationship coefficient, the PWM control signal of the vacuum contactor and the disconnector fuse group is determined, and compensation is performed according to the PWM control signal; wherein the PWM control signal includes a static reactive power compensation signal and a dynamic reactive power compensation signal.

[0020] As an embodiment of the present invention, the compensation according to the PWM control signal includes:

[0021] When the PWM control signal is a static reactive power compensation signal, a compensation coefficient is determined according to the static reactive power compensation signal;

[0022] According to the compensation coefficient, determine the load parameters of static compensation;

[0023] Determine the required number of switching reactance capacitor groups according to the load parameters, and determine the response parameters of different switching reactance capacitor groups based on the required number of groups;

[0024] The control compensation end performs compensation calculation on each switched reactance capacitor group based on the response parameter, and obtains a start-up strategy of the switched reactance capacitor group corresponding to the compensation coefficient;

[0025] When any switching reactor capacitor group meets the start-up strategy for reactive power compensation, a start-up signal for the corresponding switching reactor capacitor group is generated, and the start-up of the vacuum contactor is controlled by the start-up signal.

[0026] As an embodiment of the present invention, the compensation according to the PWM control signal includes:

[0027] When the PWM control signal is a dynamic reactive power compensation signal;

[0028] According to the dynamic reactive power compensation signal, the load change rate is obtained in real time through the SVG compensation device; wherein the load change rate is based on the voltage and current input signals on the load side of the load device, and the load value at each moment is calculated according to the voltage and current input signals;

[0029] Extract the harmonic power component of the load value at each moment, and determine the harmonic current compensation instruction according to the harmonic power component and the high-voltage bus output voltage;

[0030] Determine the compensation value at each moment according to the harmonic compensation current instruction and the load value at each moment;

[0031] The compensation value at each moment is tracked and processed through a dynamic tracking algorithm, so that the load side voltage of the load device dynamically follows the change of the compensation value at each moment.

[0032] As an embodiment of the present invention, the SVG compensation device includes a fully controlled IGBT component.

[0033] As an embodiment of the present invention, the fully-controlled IGBT component includes a collector, a sampling electrode and a control electrode; wherein the sampling electrode is used to continuously sample the reactive power of the load, and the control electrode is used to perform dynamic compensation calculations based on the sampling results.

[0034] The beneficial effects of the present invention are:

[0035] The present invention avoids the disadvantages of traditional TBB and adds the advantages of SVG through a high-voltage reactive power dynamic hybrid compensation device of TBB+SVG; the SVG dynamic compensation has a fast response speed and can compensate for loads with fast reactive power changes, and the TBB static reactive power compensation is used to compensate for loads with relatively stable reactive power changes that are not frequent in the system; the combined compensation of the two can achieve fine adjustment, high compensation accuracy, and good compensation effect.

[0036] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0037] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 A system implementation process diagram of a voltage-stabilizing power quality comprehensive management device in an embodiment of the present invention;

[0040] Figure 2 A decision flow chart of the decision control steps of the decision controller in an embodiment of the present invention;

[0041] Figure 3 The figure is a flow chart of a compensation process for compensating a PWM control signal in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] like Figure 1 As shown, the present invention proposes a voltage-stabilizing type comprehensive power quality control device, comprising:

[0044] The TBB static reactive power compensation device comprises at least one switching reactance capacitor group; wherein the reactance capacitor group comprises a vacuum contactor;

[0045] The SVG dynamic reactive power compensation device comprises an SVG compensation device SVG, wherein the SVG compensation device SVG is electrically connected to a transformer T through an isolating switch fuse group QSA; wherein the transformer T is electrically connected to a switching reactance capacitor group.

[0046] The principle of the above technical solution is:

[0047] The TBB static reactive power compensation device is composed of at least one group of switched reactance capacitors, wherein the reactance capacitor group includes a vacuum contactor. Specifically, it also includes a controller, which can receive instructions from the monitoring system and control the switching state of the vacuum contactor, thereby changing the charging or discharging state of the capacitor group to achieve voltage control. When the power is turned on, the capacitor group begins to charge, thereby offsetting the reactive power in the circuit and bringing the circuit to a balanced state. When there is a voltage fluctuation in the circuit, the capacitor group will automatically discharge, adjust the voltage value, and maintain circuit balance. In addition, in order to improve the reliability and safety of the equipment, the device can also be equipped with an overload protection device and a short-circuit protection device.

[0048] The SVG dynamic reactive power compensation device includes an SVG compensation device SVG and an SVG compensation device SVG, which are electrically connected to a transformer T through an isolating switch fuse group QSA. The transformer T is electrically connected to a switching reactance capacitor group. Specifically, it also includes a controller, which can receive instructions from a monitoring system and control the switching state of the SVG compensation device, thereby changing the reactive power of the circuit and achieving voltage control. When the power is turned on, the SVG compensation device starts to work, absorbing the reactive power in the circuit and bringing the circuit to a balanced state. When there is a voltage fluctuation in the circuit, the SVG compensation device will also automatically adjust its output to maintain the balance of the circuit. In addition, in order to improve the reliability and safety of the equipment, the device can be equipped with an overload protection device and a short-circuit protection device.

[0049] The beneficial effects of the above technical solution are:

[0050] The present invention avoids the disadvantages of traditional TBB and adds the advantages of SVG through a high-voltage reactive power dynamic hybrid compensation device of TBB+SVG; the SVG dynamic compensation has a fast response speed and can compensate for loads with fast reactive power changes, and the TBB static reactive power compensation is used to compensate for loads with relatively stable reactive power changes that are not frequent in the system; the combined compensation of the two can achieve fine adjustment, high compensation accuracy, and good compensation effect.

[0051] As an embodiment of the present invention, the switching reactance capacitor bank includes:

[0052] A current transformer TA and a series reactor L connected in series with the vacuum contactor;

[0053] The series reactor L is grounded through a zinc oxide lightning arrester FV, and the series reactor L is also connected to a parallel capacitor C; wherein the series fuse and the parallel capacitor are connected in parallel with a discharge coil TV.

[0054] The technical principle of the above technical solution is:

[0055] In the application itself, the switching of the reactance capacitor group controls the input or removal of the capacitor and the reactor through the vacuum contactor, thereby adjusting the reactive power and improving the power factor. The current transformer TA is connected in series in the circuit to monitor the current flowing through the reactor, provide signals for the protection device, and can be used for electric energy measurement. The series reactor is used to limit the inrush current when the capacitor group is put into operation (that is, the large current generated when the capacitor is initially charged), reduce the impact on the system, and filter the harmonics of a specific frequency. The zinc oxide lightning arrester FV is used to protect the reactor from damage by overvoltage in the power grid. It can guide the overvoltage to the ground, thereby protecting the reactor. The parallel capacitor C is used to compensate for reactive power, improve the power factor, reduce line losses, and improve voltage quality. Among the fuses and discharge coils TV, the fuse provides overcurrent protection for the capacitor and the reactor; the discharge coil TV is used to quickly release the energy stored in the capacitor after the power supply is disconnected to prevent the residual voltage on the capacitor from being too high.

[0056] As an embodiment of the present invention, the TBB static reactive power compensation device and the SVG dynamic reactive power compensation device are both connected to the high-voltage bus through a series-connected isolating switch QS, a capacitor transformer group TA and a normally closed switch KA; wherein the capacitor transformer group TA is not less than one group.

[0057] The technical principle of the above technical solution is:

[0058] In the application itself, the TBB static reactive power compensation device is usually composed of thyristor-controlled capacitors and reactors to provide fixed reactive power compensation; the SVG dynamic reactive power compensation device uses controllable power electronic devices to quickly adjust reactive power and achieve dynamic compensation of reactive power. The disconnector QS is used to safely disconnect the device from the high-voltage busbar in the event of maintenance or failure. The capacitor transformer group TA is used to monitor the current, provide protection signals, and may participate in the control process. The normally closed switch KA remains closed under normal operating conditions and is used to control the connection or disconnection of the reactive power compensation device.

[0059] As an embodiment of the present invention, the TBB static reactive power compensation device is used to receive a first reactive power signal, and compensate for a base load when the reactive power signal is in a preset power range.

[0060] The technical principle of the above technical solution is:

[0061] In actual implementation, the first reactive power signal refers to the monitored reactive power demand signal, which can be obtained by the reactive power detection device in the power system by detecting the load device connected to the device of the present invention. The preset power interval is a reactive power range preset in the TBB static reactive compensation device. When the actually monitored reactive power falls within this interval, the TBB device will start reactive compensation. Basic load compensation is to provide reactive power through its internal thyristor-controlled capacitors and capacitor banks to compensate for the basic load reactive demand in the load.

[0062] The working process is as follows:

[0063] When the reactive power signal in the power grid is monitored and is within a preset power range, the TBB device receives the signal and activates.

[0064] The TBB device changes the access degree of capacitors and reactors by adjusting the conduction angle of the thyristor according to the size and phase of the signal, thereby providing the required reactive power.

[0065] The TBB device can perform reactive power compensation on the base load (i.e. the load during normal operation) in the load, improve the power factor, and reduce reactive power flow in the load.

[0066] As an embodiment of the present invention, the SVG dynamic reactive power compensation device is used to receive a second reactive power signal, and when the second reactive power signal exceeds a preset power range, determine the load change rate and track the change rate, and track and compensate the dynamic load according to the change rate tracking result.

[0067] The technical principle of the above technical solution is:

[0068] In actual implementation, the second reactive power signal is another signal of the reactive power demand monitored in the load, and is usually used to indicate the rapidly changing reactive power demand in the load. The preset power interval is a reactive power range preset in the SVG dynamic reactive compensation device. When the reactive power actually monitored exceeds this interval, the SVG device will take action to compensate. Load change rate judgment is that the SVG device will analyze the received second reactive power signal to determine the rate of load change (that is, how fast the reactive power demand changes). Change rate tracking is the rapid response capability of the SVG device, which can track the rate of change of reactive power demand in real time to ensure the timeliness and accuracy of reactive compensation. Dynamic load tracking compensation is the result of tracking the load change rate. The SVG device can quickly adjust its output reactive power to compensate for the reactive demand of the dynamic load of the current bus.

[0069] As an embodiment of the present invention, the TBB static reactive power compensation device and the SVG dynamic reactive power compensation device are further connected to a decision controller, and the decision controller is configured with the following decision steps:

[0070] Calculating a first capacitor voltage average value of the load and a second capacitor voltage average value of the high-voltage bus output voltage respectively according to the first reactive power signal and the second reactive power signal;

[0071] Inputting a preset voltage reference value and an average value of the second capacitor voltage into a voltage loop controller to determine a first compensation voltage;

[0072] Combining the first compensation voltage and the circulating current value to determine a first relationship coefficient between the modulation wave displacement and the modulation ratio;

[0073] Inputting the average value of the first capacitor voltage into the voltage balancing controller to perform voltage balancing calculation and determine the carrier adjustment coefficient;

[0074] According to the carrier adjustment coefficient and the first relationship coefficient, the PWM control signal of the vacuum contactor and the disconnector fuse group is determined, and compensation is performed according to the PWM control signal; wherein the PWM control signal includes a static reactive power compensation signal and a dynamic reactive power compensation signal.

[0075] The technical principle of the above technical solution is:

[0076] like Figure 2 As shown, in actual implementation, the decision controller is a central control unit responsible for receiving and analyzing reactive power signals and making control decisions to optimize power quality. The decision controller calculates the first capacitor voltage average value of the load and the second capacitor voltage average value of the high-voltage bus output voltage according to the first reactive power signal and the second reactive power signal. These average values ​​are used for the voltage state of the equipment or power grid connected to the device of the present invention. Then, the preset voltage reference value and the second capacitor voltage average value are input into the voltage loop controller to generate a first compensation voltage. The function of the voltage loop controller is to maintain the system voltage within a set range. Then, by combining the first compensation voltage and the circulating current value, the first relationship coefficient between the modulation wave displacement and the modulation ratio is determined. This helps to adjust the output of the SVG and TBB devices to optimize reactive compensation. Then, the first capacitor voltage average value is input into the voltage balancing controller for voltage balancing calculation to determine the carrier adjustment coefficient. The voltage balancing controller ensures voltage balance between capacitor banks. Finally, according to the carrier adjustment coefficient, the decision controller determines the PWM (pulse width modulation) control signal of the vacuum contactor and the disconnector fuse group. The PWM (pulse width modulation) control signal is used to control the compensation action of the TBB and SVG devices.

[0077] As an embodiment of the present invention, the compensation according to the PWM control signal includes:

[0078] When the PWM control signal is a static reactive power compensation signal, a compensation coefficient is determined according to the static reactive power compensation signal;

[0079] According to the compensation coefficient, determine the load parameters of static compensation;

[0080] Determine the required number of switching reactance capacitor groups according to the load parameters, and determine the response parameters of different switching reactance capacitor groups based on the required number of groups;

[0081] The control compensation end performs compensation calculation on each switched reactance capacitor group based on the response parameter, and obtains a start-up strategy of the switched reactance capacitor group corresponding to the compensation coefficient;

[0082] When any switching reactor capacitor group meets the start-up strategy for reactive power compensation, a start-up signal for the corresponding switching reactor capacitor group is generated, and the start-up of the vacuum contactor is controlled by the start-up signal.

[0083] The principle of the above technical solution is:

[0084] like Figure 3 As shown, in actual implementation, first, by receiving and parsing the PWM control signal, the corresponding compensation coefficient can be determined according to different compensation types. Then, based on this compensation coefficient, the load parameters required for static compensation can be calculated, and the required number of switching reactance capacitor groups and their response parameters can be determined based on these parameters. Finally, the specific compensation strategy of the compensation end is controlled based on these parameters to ensure effective compensation of reactive power.

[0085] The compensation strategy can be divided into two stages.

[0086] The first stage is to determine the compensation coefficient. The coefficient is usually calculated based on factors such as system load characteristics and power network topology. After determining the compensation coefficient, the load parameters required for static compensation, such as capacitor capacity and phase angle, can be further calculated based on this coefficient.

[0087] The second stage is to determine the response parameters of the switching reactance capacitor bank. The response parameters include the opening time and speed of each capacitor bank. The calculation is based on multiple factors such as the rated capacity, rated current, impedance, inductance and capacitance characteristics of the capacitor bank. The final response parameters are used to control the compensation behavior of the compensation end.

[0088] As an embodiment of the present invention, the compensation according to the PWM control signal includes:

[0089] When the PWM control signal is a dynamic reactive power compensation signal;

[0090] According to the dynamic reactive power compensation signal, the load change rate is obtained in real time through the SVG compensation device; wherein the load change rate is based on the voltage and current input signals on the load side of the load device, and the load value at each moment is calculated according to the voltage and current input signals;

[0091] Extract the harmonic power component of the load value at each moment, and determine the harmonic current compensation instruction according to the harmonic power component and the high-voltage bus output voltage;

[0092] Determine the compensation value at each moment according to the harmonic compensation current instruction and the load value at each moment;

[0093] The compensation value at each moment is tracked and processed through a dynamic tracking algorithm, so that the load side voltage of the load device dynamically follows the change of the compensation value at each moment.

[0094] The principle of the above technical solution is:

[0095] In actual implementation, when the PWM control signal is detected, the voltage and current input signals on the load device are obtained through sensors or simulators. Based on these input signals, the load value at each moment can be calculated by filtering and integration. Next, the harmonic power component of the load value at each moment is extracted, and the harmonic current compensation instruction is determined based on the harmonic power component and the high-voltage bus output voltage. Based on the harmonic compensation current instruction and the load value at each moment, the compensation value at each moment can be calculated. Finally, the compensation value at each moment is tracked and processed through a dynamic tracking algorithm, so that the load side voltage of the load device dynamically follows the changes in the compensation value at each moment.

[0096] As an embodiment of the present invention, the SVG compensation device includes a fully controlled IGBT component.

[0097] In actual implementation, the fully controlled IGBT components were introduced into the SVG compensation device of the voltage-stabilized power quality comprehensive management device. The fully controlled IGBT components have the advantages of fast response, large capacity and high-frequency current conversion capability, and can complete the compensation and control of reactive power within milliseconds, thereby achieving more accurate and fast dynamic reactive power compensation. In traditional SVG compensation devices, commonly used devices are thyristor valves (SCR) or transistors, which have relatively slow response speeds and cannot meet the needs of modern power electronic equipment. The fully controlled IGBT components can shorten the response time of the compensation process to the microsecond level, improving the accuracy and efficiency of compensation. The fully controlled IGBT components are small in size, light in weight, and high in energy density, and are more suitable for integrated and modular design. This can not only reduce costs, but also improve the reliability and stability of the system, and reduce failure rates and maintenance costs.

[0098] As an embodiment of the present invention, the fully-controlled IGBT component includes a collector, a sampling electrode and a control electrode; wherein the sampling electrode is used to sample the reactive power of the load, and the control electrode is used to perform dynamic compensation calculations according to the sampling results.

[0099] The technical principle of the above technical solution is:

[0100] In actual implementation, the present invention optimizes and improves the design of the fully controlled IGBT component, and adopts three parts, namely the collector, sampling electrode and control electrode, to work together. Among them, the sampling electrode is responsible for sampling and detecting the reactive power of the load, which can better adapt to the changes in different load environments; the control electrode calculates the dynamic compensation required in real time based on the sampling results, and accurately controls the IGBT, realizing efficient dynamic reactive compensation.

[0101] The dynamic reactive power compensation of the voltage-stabilizing power quality comprehensive management device is made more accurate and intelligent. Through real-time monitoring and analysis of the load environment, dynamic reactive power compensation can be automatically performed according to the characteristics and changes of the load, thereby further improving the stability of the power quality.

[0102] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A voltage-stabilizing power quality comprehensive management device, characterized in that: include: The TBB static reactive power compensation device comprises at least one switching reactance capacitor group; wherein the reactance capacitor group comprises a vacuum contactor; The SVG dynamic reactive power compensation device comprises an SVG compensation device SVG, wherein the SVG compensation device SVG is electrically connected to a transformer T through an isolating switch fuse group QSA; wherein the transformer T is electrically connected to a switching reactance capacitor group.

2. The voltage-stabilizing power quality comprehensive management device according to claim 1, characterized in that: The switching reactance capacitor bank comprises: A current transformer TA and a series reactor L connected in series with the vacuum contactor; The series reactor L is grounded through a zinc oxide lightning arrester FV, and the series reactor L is also connected to a parallel capacitor C; wherein the series fuse and the parallel capacitor are connected in parallel with a discharge coil TV.

3. The voltage-stabilizing power quality comprehensive management device according to claim 1, characterized in that: The TBB static reactive power compensation device and the SVG dynamic reactive power compensation device are both connected to the high-voltage busbar via a series-connected isolating switch QS, a capacitor transformer group TA and a normally closed switch KA; wherein the capacitor transformer group TA is not less than one group.

4. The voltage-stabilizing power quality comprehensive management device according to claim 3, characterized in that: The TBB static reactive power compensation device is used to receive a first reactive power signal and compensate for a base load when the reactive power signal is in a preset power range.

5. The voltage-stabilizing power quality comprehensive management device according to claim 4, characterized in that: The SVG dynamic reactive power compensation device is used to receive a second reactive power signal, and when the second reactive power signal exceeds a preset power interval, determine the load change rate and track the change rate, and track and compensate the dynamic load according to the change rate tracking result.

6. The voltage-stabilizing power quality comprehensive management device according to claim 5, characterized in that: The TBB static reactive power compensation device and the SVG dynamic reactive power compensation device are also connected to a decision controller, and the decision controller is configured with the following decision steps: Calculating a first capacitor voltage average value of the load and a second capacitor voltage average value of the high-voltage bus output voltage respectively according to the first reactive power signal and the second reactive power signal; Inputting a preset voltage reference value and an average value of the second capacitor voltage into a voltage loop controller to determine a first compensation voltage; Combining the first compensation voltage and the circulating current value to determine a first relationship coefficient between the modulation wave displacement and the modulation ratio; Inputting the average value of the first capacitor voltage into the voltage balancing controller to perform voltage balancing calculation and determine the carrier adjustment coefficient; According to the carrier adjustment coefficient and the first relationship coefficient, the PWM control signal of the vacuum contactor and the disconnector fuse group is determined, and compensation is performed according to the PWM control signal; wherein the PWM control signal includes a static reactive power compensation signal and a dynamic reactive power compensation signal.

7. The voltage-stabilizing power quality comprehensive management device according to claim 6, characterized in that: The compensation according to the PWM control signal comprises: When the PWM control signal is a static reactive power compensation signal, a compensation coefficient is determined according to the static reactive power compensation signal; According to the compensation coefficient, determine the load parameters of static compensation; Determine the required number of switching reactance capacitor groups according to the load parameters, and determine the response parameters of different switching reactance capacitor groups based on the required number of groups; The control compensation end performs compensation calculation on each switched reactance capacitor group based on the response parameter, and obtains a start-up strategy of the switched reactance capacitor group corresponding to the compensation coefficient; When any switching reactor capacitor group meets the start-up strategy for reactive power compensation, a start-up signal for the corresponding switching reactor capacitor group is generated, and the start-up of the vacuum contactor is controlled by the start-up signal.

8. The voltage-stabilizing power quality comprehensive management device according to claim 6, characterized in that: The compensation according to the PWM control signal comprises: When the PWM control signal is a dynamic reactive power compensation signal; According to the dynamic reactive power compensation signal, the load change rate is obtained in real time through the SVG compensation device; wherein the load change rate is based on the voltage and current input signals on the load side of the load device, and the load value at each moment is calculated according to the voltage and current input signals; Extract the harmonic power component of the load value at each moment, and determine the harmonic current compensation instruction according to the harmonic power component and the high-voltage bus output voltage; Determine the compensation value at each moment according to the harmonic compensation current instruction and the load value at each moment; The compensation value at each moment is tracked and processed through a dynamic tracking algorithm, so that the load side voltage of the load device dynamically follows the change of the compensation value at each moment.

9. The voltage-stabilizing power quality comprehensive management device according to claim 1, characterized in that: The SVG compensation device includes a fully controlled IGBT component.

10. The voltage-stabilizing power quality comprehensive management device according to claim 9, characterized in that: The fully controlled IGBT component comprises a collector, a sampling electrode and a control electrode; wherein the sampling electrode is used to sample the reactive power of the load, and the control electrode is used to perform dynamic compensation calculation according to the sampling result.

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