Voltage source type dynamic reactive power compensator topology circuit based on rotating phase-shifting transformer

Abstract

The application discloses a voltage source type dynamic reactive power compensator topology circuit based on a rotary phase shifting transformer (RPST) and belongs to the field of reactive power compensation of power distribution networks. The single-phase or three-phase voltage source type dynamic reactive power compensator topology circuit mainly comprises a series inductor, a double RPST phase shifting transformer and a rotor position angle adjusting component and a parallel compensation capacitor. The single-phase or three-phase voltage source type dynamic reactive power compensator topology circuit is composed. A voltage vector with continuously adjustable amplitude and phase is synthesized through the single-phase or three-phase double RPST. The voltage on both sides of the compensation capacitor is adjusted, so that the continuous and bidirectional compensation of the reactive power is realized. The application has the advantages of easy high-voltage, large capacity, low harmonic, easy operation and maintenance, low cost, strong impact resistance and the like. The cost performance of the application is higher for the case of compensating for a single direction inductive load.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reactive power compensation of power distribution network, and particularly relates to a new type of dynamic reactive power compensation of a new type of power distribution network containing distributed new energy and nonlinear loads such as electric vehicles. BACKGROUND

[0002] The State Grid Corporation of China and the Southern Power Grid Corporation propose to plan and build a new type of power system with new energy as the main body. Among them, the new type of power distribution network with a large number of distributed power sources, distributed energy storage and nonlinear loads such as electric vehicles is a key link for the new type of power system to achieve the "double carbon" goal. With the increasing penetration rate of distributed new energy in the power distribution network, the power flow of the power distribution network is gradually complex, and the boundary between power supply and power consumption is gradually blurred, which brings great challenges to the voltage control of the new type of power distribution network. The voltage overrunning problem seriously restricts the rapid development of distributed new energy. With the acceleration of electric energy substitution, nonlinear loads such as electric vehicles and air conditioners are increasing year by year, and the demand for reactive power of the system is also increasing. Installing reactive power compensation equipment at key nodes of the power distribution network can not only reduce line loss and improve the transmission capacity of the power distribution line, but also stabilize voltage, improve power supply quality and improve load working efficiency.

[0003] When a static var compensator (SVC) is used, the device structure is simple, easy to install, cost-effective, and has high regulation efficiency, so the SVC is the most common reactive power compensation device in the power system. The SVC mainly includes a thyristor switching capacitor (TSC) and a thyristor control reactor (TCR). The TSC relies on the step adjustment of the switching capacitor to adjust the reactive power, and is generally in an over-compensation or under-compensation state. The TCR can continuously adjust the reactive power by adjusting the thyristor trigger angle, and can absorb the excess reactive power in cooperation with the TSC, but there is a serious harmonic problem in the TCR adjustment process, which seriously affects the power supply quality of the power grid.

[0004] When a static synchronous compensator (STATCOM) is used, the power electronic switch control is flexible, the modulation is convenient, has good fast response ability and precise compensation ability, can provide continuous and dynamic reactive power support to the system, and the harmonic problem has been greatly improved. However, the cost of power electronic devices is high, the resistance is poor, and it is not easy to be high-voltage and large-capacity, so it is difficult to be widely used in the power distribution network.

[0005] When the SVC and STATCOM hybrid compensation device is used, the SVC undertakes the main voltage drop and large capacity compensation, and the STATCOM realizes small capacity accurate compensation, so that the capacity of the STATCOM can be effectively reduced, and the investment cost of the whole device is reduced, but the dynamic adjustment process caused by the switching of the capacitor each time will bring a certain impact to the STATCOM, seriously affecting the service life of the device, and the harmonic problem brought by the power electronic device has not been effectively solved.

[0006] The combination of the cascaded multi-level converter (CHB) or the modular multi-level converter (MMC) and the STATCOM can effectively reduce the stress of the power electronic device, will not inject a large amount of harmonics to the system, and can realize high-voltage, large-capacity accurate compensation, but the control strategy is relatively complex, the cost is relatively high, and it cannot be widely applied.

[0007] Therefore, it is necessary to invent a single-phase or three-phase dynamic var compensator topology circuit which can meet the demand of new power distribution network reactive power compensation, has continuous and bidirectional reactive power compensation capacity, is economical in cost, easy to be high-voltage and large-capacity, has good resistance and strong impact resistance, and is easy to operate and maintain. SUMMARY

[0008] The application mainly provides a single-phase or three-phase voltage source dynamic var compensator (VS-DVC) topology circuit based on a rotary phase shifting transformer (RPST), which realizes continuous and bidirectional reactive power compensation according to the working principle of a voltage source converter (VSC) and the phase-shifting voltage regulation mechanism of the RPST. The basic idea is that the VS-DVC is connected in parallel at the reactive power compensation point to provide compensation current, and the size and direction of the compensation current are continuously changed by adjusting the voltage amplitude on both sides of the capacitor, so that full compensation of the load reactive current can be realized.

[0009] To solve the above technical problems, the technical scheme provided by the application is to realize continuous adjustment of the voltage on both sides of the capacitor according to the phase-shifting voltage regulation principle of RPST, and then continuously adjust the size and direction of the compensation current. The basic structure includes: series inductance, double RPST phase-shifting transformer and rotor position angle adjusting components and parallel compensation capacitor. The specific technical method is: the rotor windings of the two RPSTs are connected in parallel as primary windings, connected through series inductance to the parallel compensation point, and the stator windings of the RPST are connected in series as secondary windings and connected to both sides of the compensation capacitor. By adjusting the relative position angle of the primary and secondary windings of the RPST, the phase difference of the output voltage to the input voltage can be changed, the output voltage amplitudes of the two RPSTs are similar, and the phase depends on the relative position angle of the primary and secondary windings. Only by adjusting the relative position angle in the range of 0° to ±90°, the voltage amplitude on both sides of the capacitor can be continuously adjusted in the range of 0 to 2U 2N , and then the amplitude and direction of the compensation current can be changed. When the voltage amplitude on both sides of the capacitor is large, the reactive power generated by the capacitor is greater than the reactive power absorbed by the inductor, and the network side characteristic of the VS-DVC is capacitive; when the voltage amplitude on both sides of the capacitor is small, the reactive power absorbed by the inductor is greater than the reactive power generated by the capacitor, and the network side characteristic of the VS-DVC is inductive. Therefore, the VS-DVC can realize continuous and bidirectional compensation of reactive power, meet the requirements of new distribution network for precise compensation, cost economy, easy operation and maintenance, strong impact resistance and good tolerance, etc. Since the network side characteristic of the VS-DVC mainly depends on the voltage on both sides of the capacitor, only by changing the size of the compensation capacitor, the rated range of the reactive power generated by the VS-DVC can be changed, so the VS-DVC mainly generates reactive power, and is especially suitable for compensating inductive load and flexible compensation range.

[0010] Compared with the most commonly used SVC in distribution systems, the use of VS-DVC can not only effectively solve the many problems caused by TSC step regulation, but also realize full compensation which cannot be achieved by TSC, and will not inject harmonics into the distribution network, affecting the power supply quality of the entire system. Compared with the fast response type reactive power compensation device STATCOM, the VS-DVC uses two RPSTs instead of the power switch tube bridge in STATCOM, which reduces the investment cost of power electronic devices, does not need to consider the withstand voltage problem of power electronic devices, is easy to be high-voltage and large-capacity, has good tolerance, and can be widely used in new distribution networks. Compared with cascaded H-bridge STATCOM and MMC-STATCOM, on the basis of realizing high voltage, large capacity and precise compensation, the investment cost of the entire device is greatly reduced, and there is no need for complex control methods, which has good development prospects. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1This is a schematic diagram of an electrical system application of a preferred embodiment of the single-phase voltage source type dynamic reactive power compensator topology circuit based on RPST.

[0012] Figure 2 This is a schematic diagram of an electrical system application of a preferred embodiment of the three-phase voltage source type dynamic reactive power compensator topology circuit based on RPST.

[0013] Figure 3 This is a schematic diagram of the electrical principle of a single-phase voltage source type dynamic reactive power compensator topology circuit based on RPST.

[0014] Figure 4 This is a schematic diagram of the electrical wiring of a single-phase voltage source type dynamic reactive power compensator topology based on RPST.

[0015] Figure 5 This is a schematic diagram of the electrical principle of a three-phase voltage source type dynamic reactive power compensator topology circuit based on RPST.

[0016] Figure 6 This is a schematic diagram of the electrical wiring of a three-phase voltage source type dynamic reactive power compensator topology based on RPST. Detailed Implementation

[0017] This invention provides a voltage source type dynamic reactive power compensator topology circuit based on RPST. The voltage source type dynamic reactive power compensator topology circuit mainly includes a series inductor, a dual RPST phase-shifting transformer and its rotor position angle adjustment component, and a parallel compensation capacitor. In specific applications, it can be divided into a single-phase voltage source type dynamic reactive power compensator topology circuit and a three-phase voltage source type dynamic reactive power compensator topology circuit.

[0018] The dual RPST phase-shifting transformer and its rotor position angle adjustment component mainly include a primary winding, a primary core magnetic circuit, a secondary winding, and a secondary core magnetic circuit. The primary windings of the two RPST transformers are connected in parallel and then connected to the reactive power compensation point of the power grid via a series inductor. Utilizing the principle of electromagnetic induction, adjusting the relative position angle between the primary and secondary windings allows for continuous adjustment of the output voltage phase relative to the input voltage phase without changing the voltage amplitude. By connecting the secondary windings of the two RPST transformers in series and utilizing the principle of vector synthesis, continuous adjustment of the secondary voltage amplitude and phase can be achieved, thereby changing the magnitude and direction of the compensated reactive power.

[0019] The single-phase or three-phase voltage source type dynamic reactive power compensator topology is characterized by taking into account the equivalent power supply of the power distribution system with internal impedance. Output voltage Connect directly to the load, select the equivalent power source outlet as the parallel reactive power compensation point, and connect a single-phase or three-phase voltage source type dynamic reactive power compensator to the compensation point. The single-phase voltage source type dynamic reactive power compensator provides the compensation current. Compensation for load-side current reactive component in the load side current in phase with the supply voltage and maintain the power factor of the supply side A phase to be a set value. The three-phase voltage source type dynamic reactive power compensator provides a compensation current compensates the reactive component in the load side current in phase with the supply voltage and maintain the power factor of the supply side to be a set value.

[0020] The application will be further described below in conjunction with the drawings and examples.

[0021] Example 1: RPST-based single-phase voltage source type dynamic reactive power compensator topology circuit:

[0022] Figure 1 The RPST-based single-phase voltage source type dynamic reactive power compensator shown is connected in parallel in a single-phase distribution line, is suitable for compensating for the lack of reactive power caused by single-phase nonlinear load users, can realize on-site compensation of reactive power at the user end, reduce the flow of reactive power on the distribution line, can also reduce the three-phase imbalance caused by single-phase loads, can effectively reduce the line loss of the distribution network, improve the transmission capacity and power supply quality of the distribution network, and is conducive to the economic and stable operation of the distribution network. When the line end is connected to a single-phase nonlinear load, the single-phase voltage source type dynamic reactive power compensator provides a compensation current compensates the reactive component in the load side current in phase with the supply voltage and current always maintain the same phase, the single-phase voltage source type dynamic reactive power compensator is more commonly used in capacitive working conditions in practical applications, and compensates for single-phase inductive loads.

[0023] Figure 3 ​The electrical schematic diagram of the RPST-based single-phase voltage source type dynamic reactive power compensator topology circuit shown mainly includes series inductance 1, double RPST phase-shifting transformer and rotor position angle adjusting component 2 and parallel compensation capacitor 3. The primary windings 4 of the two single-phase RPSTs in the double RPST phase-shifting transformer and rotor position angle adjusting component 2 are connected in parallel, one end of which is connected to the live wire A of the line through the series inductance 1, and the other end is connected to the neutral wire N. The voltage and power transformation between the primary windings 4 and the secondary windings 7 is realized through the main magnetic circuit composed of the primary core 5 and the secondary core 6 and the air gap. The secondary windings of the two RPSTs are connected in series and connected to the two sides of the compensation capacitor 3. According to the principle of vector synthesis, by adjusting the relative position angles 8 and 9 of the primary and secondary windings of the two RPSTs, a voltage vector with continuous adjustable amplitude and phase can be synthesized, so as to adjust the reactive power emitted by the capacitor and change the grid-side characteristics of the single-phase dynamic reactive power compensator. Therefore, by applying a certain control strategy to control α1 and α2, the required reactive power for precisely compensating the single-phase nonlinear load, especially the inductive load, can be realized.

[0024] Figure 4 The electrical schematic diagram of the RPST-based single-phase voltage source type dynamic reactive power compensator topology circuit shown mainly includes series inductance 1, double RPST phase-shifting transformer and rotor position angle adjusting component 2 and parallel compensation capacitor 3. The primary windings 4 of the two single-phase RPSTs in the double RPST phase-shifting transformer and rotor position angle adjusting component 2 are connected in parallel, one end of which is connected to the live wire A of the line through the series inductance 1, and the other end is connected to the neutral wire N. The voltage and power transformation between the primary windings 4 and the secondary windings 7 is realized through the main magnetic circuit composed of the primary core 5 and the secondary core 6 and the air gap. The secondary windings of the two RPSTs are connected in series and connected to the two sides of the compensation capacitor 3. According to the principle of vector synthesis, by adjusting the relative position angles 8 and 9 of the primary and secondary windings of the two RPSTs, a voltage vector with continuous adjustable amplitude and phase can be synthesized, so as to adjust the reactive power emitted by the capacitor and change the grid-side characteristics of the single-phase dynamic reactive power compensator. Therefore, by applying a certain control strategy to control α1 and α2, the required reactive power for precisely compensating the single-phase nonlinear load, especially the inductive load, can be realized.

[0025] Example 2 RPST-based three-phase voltage source type dynamic reactive power compensator topology circuit:

[0026] Figure 2The RPST-based three-phase voltage source type dynamic reactive power compensator shown is connected in a three-phase distribution line, is suitable for reactive power compensation and voltage control of a new type of distribution network grid connection point and a system key node with a large number of distributed new energy access, is conducive to improving the penetration rate of distributed new energy in the distribution network, reducing carbon emissions of electric energy in the production and transmission link, improving the terminal consumption proportion of electric energy, and accelerating energy replacement; it is also suitable for reactive power on-site compensation of a new type of distribution network terminal with a large number of electric vehicles, air conditioners and other nonlinear loads, reduces the network loss caused by a large range of reactive power flow in the distribution network, improves the transmission capacity and power supply quality of the distribution network, avoids the unqualified power quality caused by a large number of nonlinear loads, improves the economic stability of the entire distribution network operation, and is conducive to accelerating electric energy replacement. When the line end is connected to a three-phase nonlinear load, the three-phase voltage source type dynamic reactive power compensator provides compensation current respectively compensating the reactive components in the load current so that the three-phase voltages and currents on the power supply side always remain in phase, the three-phase voltage source type dynamic reactive power compensator is more commonly used in capacitive working conditions, and compensates three-phase inductive loads.

[0027] Figure 5 The electrical principle diagram of the RPST-based three-phase voltage source type dynamic reactive power compensator topological circuit is shown, mainly including a series inductor 1, a three-phase double RPST phase-shifting transformer and a rotor position angle adjusting part 10 thereof, and a parallel compensation capacitor 3. The primary windings 4 of the two three-phase RPSTs in the three-phase RPST phase-shifting and voltage regulating part 10 are connected in parallel in correspondence with the phases, are connected to the corresponding live lines A, B and C through the series inductor 1 at the parallel point, and the other end is uniformly connected to the neutral line N. The voltage and power transformation between the primary windings 4 and the secondary windings 7 are realized through the main magnetic circuit composed of the primary core 5 and the secondary core 6 and the air gap, and the two three-phase RPST secondary windings are connected in series to form a star type and are connected to the two sides of the three-phase compensation capacitor 3. According to the vector synthesis principle, by adjusting the relative position angles 8 and 9 of the primary and secondary windings of the two three-phase RPSTs, a three-phase voltage vector with continuously adjustable amplitude and phase can be synthesized, the reactive power output by the compensation capacitor is adjusted, and the network side characteristics of the three-phase dynamic reactive power compensator are changed. Therefore, by applying a suitable control strategy to control α1 and α2, precise compensation of the reactive power of the key node of the new type of distribution network can be realized.

[0028] Figure 6The figure is the electrical connection diagram of the RPST-based three-phase voltage source dynamic reactive power compensator topology circuit. The primary windings 401, 402, 403, 404, 405, 406 of two three-phase RPSTs are connected in parallel corresponding to the phases, connected to the parallel points A, B, C phase live lines through series inductors 101, 102, 103, and the power grid supplies the exciting current to the primary windings of the three-phase RPST. The current generates a rotating magnetic field in the primary core 501, 502 and the secondary core 601, 602 and the air gap therebetween, and induces electromotive force in the primary windings 401, 402, 403, 404, 405, 406 and the secondary windings 701, 702, 703, 704, 705, 706, respectively. The effective turn ratio of the primary and secondary windings determines the amplitude of the output voltage, and the relative position angle of the primary and secondary windings determines the phase difference of the output voltage relative to the input voltage. Therefore, when the primary windings of the RPST rotate in the opposite direction by angles α1 and α2, respectively, and the internal voltage drop of the RPST is ignored, the output voltages of 701, 702, 703 lead the input voltages of 401, 402, 403 by α1, and the output voltages of 704, 705, 706 lead the input voltages of 404, 405, 406 by α2. The secondary windings of the two three-phase RPSTs are connected in series to form a star type and are connected on both sides of the three-phase compensation capacitor 301, 302, 303, so as to realize the vector synthesis of the output voltages of the two RPSTs and adjust the output reactive power of the dynamic reactive power compensator.

[0029] In order to explain the compensation principle of the voltage source dynamic reactive power compensator in more detail, the following takes a single-phase dynamic reactive power compensator as an example to analyze its working principle.

[0030] Ignoring the internal resistance of the RPST, its own inductance is calculated into the series inductance, which is denoted as the equivalent series inductance L', and the RPST is regarded as an ideal phase-shifting transformer. According to the principle of transformer, the primary and secondary voltages of the RPST satisfy the following relationship:

[0031]

[0032] T RPST The effective turn ratio of the primary and secondary windings is 0.5. According to the principle of vector synthesis, the voltages on both sides of the compensation capacitor can be represented as:

[0033]

[0034] When α1=-α2=α, the above formula can be simplified as:

[0035]

[0036] The reactive power emitted by the compensation capacitor can be represented as:

[0037]

[0038] The compensation current of the voltage source type dynamic reactive power compensator is represented as:

[0039]

[0040] The reactive power absorbed by the equivalent series inductance is:

[0041] Q l = I 2 ωL' (6)

[0042] The reactive power provided by the voltage source type dynamic reactive power compensator can be represented as:

[0043] Q = Q l - Q c (7)

[0044] By substituting equations (3), (4), (5), and (6) into equation (7) and simplifying and approximating, we obtain:

[0045]

[0046] As shown in equation (8), when , Q < 0, at this time, the voltage across the capacitor is large, the reactive power emitted by the capacitor is greater than the reactive power absorbed by the inductor, the dynamic reactive power compensator emits reactive power to the outside, and can compensate for inductive load; when , Q > 0, at this time, the voltage across the capacitor is small, the reactive power absorbed by the inductor is greater than the reactive power absorbed by the capacitor, the dynamic reactive power compensator absorbs reactive power to the outside, and can compensate for capacitive load. The working principle of the three-phase voltage source type dynamic reactive power compensator is the same. Since the RPST itself has a self-inductance, the self-inductance can be attributed to the series inductance, and the inductance value of the series inductance can be reduced.

[0047] As described above, the present application has been described in detail, it is obvious that the present application is not limited to the given examples, as long as the substance does not deviate from the inventive point and effect of the present application, and the various modifications that can be made by those skilled in the art are also included in the protection scope of the present application.

Claims

1. A topology circuit of a voltage source type dynamic reactive compensator based on a rotating phase shift transformer (RPST), characterized in that, The voltage source type dynamic reactive power compensator topology circuit mainly comprises a connecting inductor, an RPST phase-shifting voltage regulating part and a compensation capacitor, and can be divided into a single-phase voltage source type dynamic reactive power compensator based on RPST and a three-phase voltage source type dynamic reactive power compensator based on RPST according to specific application scenarios. The RPST phase-shifting voltage regulating part mainly comprises two RPSTs, the primary windings of the RPSTs are connected in parallel and then connected to a reactive power compensation point of a power distribution system through the connecting inductor, the voltage and power transformation between the primary windings and the secondary windings are realized through a main magnetic circuit composed of a primary iron core and a secondary iron core and an air gap, the relative position angle of the primary windings and the secondary windings is adjusted to realize the continuous adjustment of the phase difference between the output voltage phase and the input voltage phase, and the secondary windings of the RPSTs are connected in series on both sides of the compensation capacitor, and according to the vector synthesis principle, a voltage vector with continuously adjustable amplitude and phase is synthesized. The RPST-based single-phase or three-phase voltage source dynamic reactive power compensator topology circuit is characterized in that the equivalent power source of the power distribution network is considered Output voltage Directly supply power to single-phase or three-phase loads, parallel single-phase or three-phase voltage source dynamic reactive power compensator at the power supply outlet, provide single-phase or three-phase current compensation for the reactive current on the load line, keep the power supply side current and voltage in phase, and maintain the power supply side power factor at a set value.

2. The voltage source type dynamic reactive compensator topology circuit based on rotating phase shift transformer (RPST) according to claim 1, characterized in that, In the single-phase RPST phase-shifting and voltage-regulating part (2), the primary windings (4) of two RPSTs are connected in parallel, connected to the live wire at the reactive power compensation point through the connecting inductor (1), and the voltage and power transformation between the primary windings (4) and the secondary windings (7) is realized through the primary core (5), the secondary core (6) and the air gap between them. By changing the relative position angle of the primary and secondary windings and adjusting the phase difference between the output voltage of each RPST and the input voltage, the voltage vector with the amplitude between 0 and 2U 2N and the phase between -90° and +90° can be obtained in the range of 0° to ±90° of the phase-shifting angle of each RPST.

3. The voltage source type dynamic reactive compensator topology circuit based on rotating phase shift transformer (RPST) according to claim 1, characterized in that, The primary windings (401) and (404), (402) and (405), (403) and (406) of two RPSTs in the three-phase RPST phase-shifting and voltage-regulating part (10) are connected in parallel and then connected to the three-phase compensation firing lines A, B, and C through the connecting inductors (101), (102), and (103) respectively, the voltage and power transformation between the primary windings (401), (402), (403), (404), (405), and (406) and the secondary windings (701), (702), (703), (704), (705), and (706) is realized through the primary cores (501) and (502) and the secondary cores (601) and (602) and the air gap between them, the phase difference adjustment of the output voltage relative to the input voltage is realized by changing the relative position angle of the primary and secondary windings of each RPST, the secondary windings (701), (702), (703), (704), (705), and (706) of the two RPSTs are connected in series to form a star type and then connected across the three-phase compensation capacitors (301), (302), and (303), the voltage applied across the actual compensation capacitors on both sides is the vector sum of the three-phase voltage output by the two RPSTs, according to the principle of vector synthesis, the phase-shifting angle of each RPST only needs to be adjusted within the range of 0° to ±90°, and a three-phase voltage vector with a continuously adjustable phase of -90° to +90° and an amplitude of 0 to 2U 2N can be obtained.

4. The voltage source type dynamic reactive compensator topology circuit based on rotating phase shift transformer (RPST) according to claim 1, characterized in that, Firstly, the power grid supplies excitation current to the primary windings of the RPST, and a rotating magnetic field is generated in the air gap, according to the electromagnetic induction principle, the primary windings and the secondary windings generate induced electromotive forces under the rotating magnetic field, the effective turn ratio determines the amplitude of the induced electromotive force, and the relative position angle determines the phase difference of the electromotive force, when the primary windings rotate by an angle of α in the opposite direction of the magnetic field, if the influence of the internal impedance of the RPST is ignored, the output voltage leads the input voltage by an angle of α.

5. The voltage source type dynamic reactive compensator topology circuit based on rotating phase shift transformer (RPST) according to claim 1, characterized in that, The two RPSTs output two single-phase or three-phase voltage vectors with fixed amplitudes and continuously adjustable phases, according to the vector synthesis principle, a synthesized voltage vector with continuously adjustable amplitude and phase can be obtained, the reactive power generated by the compensation capacitor is adjusted, and then the compensation current and the grid-side characteristics of the dynamic reactive power compensator are changed, so that the continuous adjustment of the compensation reactive power is realized, since the compensation capacitor is variable, only by changing the size of the compensation capacitor, the maximum value of the reactive power generated by the dynamic reactive power compensator can be changed, therefore, the voltage source type dynamic reactive power compensator is more suitable for generating reactive power and compensating for inductive loads.

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