A switching test method and device for capacitor compensation device

Abstract

The present invention belongs to the field of power electronic valve assembly testing, and specifically relates to a method and device for testing the switching on and off of a capacitor forcing device. The device is provided with a capacitor module including a plurality of capacitors and lead connectors corresponding to different capacitors, so that when configuring the test circuit, it can be connected to the capacitor forcing device through the lead connector, and the capacitance value in parallel with the capacitor forcing device can be flexibly selected to simulate different substation filter capacitor working conditions; and the present invention also improves the flexibility of simulating the damping and voltage working conditions of the substation respectively through the series-parallel combination of the damping resistor module and the voltage regulator, and can use the same test circuit to simulate the working environment of the capacitor forcing device under various conditions, thereby improving the overall applicability of the test device. The use of a reactor with a larger inductance value also makes the change in the voltage across the capacitor more obvious before and after the forcing device is put into operation, so it is more convenient to observe and accurately distinguish the state of the forcing device being put into operation and cut off.

Description

Technical Field

[0001] The present invention belongs to the field of power electronic valve assembly testing, and in particular relates to a switching test method and device for a capacitor compensation device. Background Art

[0002] In recent years, the power load in central and eastern my country has maintained rapid growth, with a large number of ultra-high voltage direct current (UHVDC) systems concentrated in receiving-end load centers. In particular, with the implementation of the "dual carbon" goals, the proportion of renewable energy in receiving-end power generation capacity has continued to increase. Voltage stability has become one of the key issues limiting the power supply capacity of receiving-end grids, and improving voltage stability has become an effective means of enhancing power supply capacity. Currently, voltage stability is primarily improved through reactive power compensation. This improvement requires reactive power compensation to have the ability to continuously adjust or repeatedly switch on and off; support transient voltage recovery while also maintaining steady-state reactive power balance; and be highly reliable, economical, and require minimal operation and maintenance.

[0003] At present, the main means of reactive power compensation include capacitors, phase-shifting converters (SVCs) and SVGs. Substations are usually equipped with a certain number of capacitors. The capacity of a single capacitor group on the 35kV side of a 500kV transformer is about 40Mvar to 90Mvar, and the capacity of a single capacitor group on the 10kV side of a 220kV transformer is about 6Mvar to 10Mvar. Since the reactive output of fixed capacitors is greatly reduced when the voltage is low and they cannot be quickly and continuously switched on and off, it is difficult to deal with the problem of transient voltage stability. Phase-shifting converters have strong voltage support capabilities. However, due to the large number of load points, a large number of phase-shifting converters are required, the operation and maintenance workload is large, and the cost is expensive. SVCs and SVGs technically require reserved reactive power reserves to support the system voltage during transient processes. Their dynamic voltage support capabilities are limited, and they are also expensive and require a large amount of operation and maintenance.

[0004] As a new reactive power compensation device, the capacitor compensating device can effectively avoid the above problems. When a fault occurs in the power grid and the system voltage drops, the capacitor bank can be switched on and off to raise the system voltage and avoid system tripping. However, in the prior art, the switching test of the capacitor compensating device often simulates a specific capacitor compensating device or working condition, and the test device is set up according to specific test requirements, resulting in the test being greatly restricted by the test device parameters, the test device is not very applicable, and the efficiency is low. Summary of the Invention

[0005] The object of the present invention is to provide a switching test method and device for a capacitor compensation device, so as to solve the problem in the prior art that the switching test of the capacitor compensation device is greatly limited by the parameters of the test device, resulting in poor applicability of the test device.

[0006] In order to achieve the above-mentioned object, the present invention provides a switching test device of a capacitor compensating device, comprising a switching test branch, a voltage source and a measuring module, wherein the voltage source is connected to the switching test branch and is used to power each module arranged on the switching test branch, and a reactor module, a capacitor module and a damping resistor module are provided on the switching test branch, and the capacitor module includes a plurality of capacitors for simulating a substation filter capacitor; each capacitor corresponds to a different lead-out connector, and the lead-out connector is used to be connected to both ends of the capacitor compensating device so that the capacitor compensating device is connected in parallel with the corresponding capacitor; or, the lead-out connector is used to be connected to one end of the capacitor compensating device and is also used to be connected to the other end of the capacitor compensating device through the damping resistor module so that the capacitor compensating device is connected in parallel with the branch after the corresponding capacitor and the damping resistor module are connected in series; or, the lead-out connector is used to be connected to both ends of the capacitor compensating device through the damping resistor module so that the capacitor compensating device is connected in parallel with the branch after the corresponding capacitor and the damping resistor module are connected in series;

[0007] The measuring module is used to collect information of various measurement parameters, so as to judge whether the capacitor strengthening device can be normally put into operation and removed according to the changes of the various measurement parameters.

[0008] The device is provided with a capacitor module including multiple capacitors and lead-out connectors corresponding to different capacitors, so that when configuring the test circuit, it can be connected to the capacitor compensation device through the lead-out connector, and the capacitance value connected in parallel with the capacitor compensation device can be flexibly selected to simulate different substation filter capacitor working conditions. The same test circuit can be used to simulate the working environment of the capacitor compensation device in various situations, thereby improving the overall applicability of the test device.

[0009] Furthermore, in order to flexibly simulate the substation voltage conditions that the capacitor forcing device may encounter, the voltage source includes an AC power grid, an isolation transformer and a voltage regulator. The AC power grid is connected to the switching test branch through the isolation transformer and the voltage regulator; the voltage regulator is used to adjust the output voltage of the voltage source when the switching test device is in the power-on state, so that the voltage at the capacitor forcing device and the overall loop voltage meet the corresponding requirements.

[0010] Furthermore, the damping resistor module includes a plurality of resistors connected in series and parallel. Such a resistor module configuration not only allows the resistance value to be flexibly controlled, but also increases the power of the resistor.

[0011] Furthermore, the measurement module includes: a voltage sensor for collecting the voltage at the output end of the voltage regulator, a voltage sensor for collecting the total voltage of the capacitor module, a voltage sensor for collecting the total voltage of the capacitor compensation device, and a current sensor for collecting the total current in the switching test branch.

[0012] Furthermore, the reactor module is an air-core reactor, used to provide an inductive voltage for the switching test device. Using an air-core reactor can provide a larger inductive voltage for the system, making the voltage change across the capacitor more obvious before and after the forced compensation device is activated, making it easier to observe and accurately determine the activation and removal status of the forced compensation device.

[0013] The present invention also provides a switching test method for a capacitor compensation device, the steps of which are as follows:

[0014] 1) Connecting the capacitor compensation device to be tested to a switching test device, the switching test device comprising a switching test branch, a voltage source, and a measurement module, the voltage source being connected to the switching test branch for supplying power to each module provided on the switching test branch, the switching test branch being provided with a reactor module, a capacitor module, and a damping resistor module, the capacitor module comprising a plurality of capacitors for simulating a substation filter capacitor; each capacitor corresponding to a different lead-out connector;

[0015] The connection method is as follows: connecting the two ends of the capacitance compensating device to be measured to the lead-out connectors corresponding to the capacitors in the capacitor module, so that the capacitance compensating device and the corresponding capacitors are connected in parallel; or connecting one end of the capacitance compensating device to be measured to the lead-out connector corresponding to the capacitors in the capacitor module, and the other end to the lead-out connector corresponding to the capacitors in the capacitor module through the damping resistor module, so that the capacitance compensating device and the branch formed by the series connection of the corresponding capacitor and the damping resistor module are connected in parallel; or connecting the two ends of the capacitance compensating device to be measured to the lead-out connectors corresponding to the capacitors in the capacitor module through the damping resistor module, so that the capacitance compensating device and the branch formed by the series connection of the corresponding capacitor and the damping resistor module are connected in parallel;

[0016] 2) The switching test device is powered on, and the reactor module, capacitor module, damping resistor module and measurement module are powered by a voltage source, and the substation bus voltage is simulated by the voltage source; when performing the switching test, the measurement module collects information on various measurement parameters to determine whether the capacitor compensation device can be normally switched on and off.

[0017] When configuring a test circuit, the method can connect a capacitor module including multiple capacitors to a capacitor strengthening device through corresponding lead-out connectors of different capacitors, flexibly select the capacitance value connected in parallel with the capacitor strengthening device, thereby simulating different substation filter capacitor working conditions. The same test circuit can be used to simulate the working environment of the capacitor strengthening device under various conditions, thereby improving the overall applicability of the test device.

[0018] Furthermore, the process of conducting the switching test is as follows:

[0019] Put the capacitor compensation device into the test circuit, bypass the capacitor connected in parallel with the capacitor compensation device, and use the measurement module to determine the changes in various measurement parameters to determine whether the capacitor compensation device can be put into operation normally;

[0020] Cut off the capacitance strengthening device from the test circuit, put the capacitor connected in parallel with the capacitance strengthening device into the test circuit, determine the changes of various measurement parameters through the measurement module, and judge whether the capacitance strengthening device can be cut off normally.

[0021] Furthermore, in order to flexibly simulate the substation voltage conditions that the capacitor forcing device may encounter, the voltage source includes an AC power grid, an isolation transformer and a voltage regulator. The AC power grid is connected to the switching test branch through the isolation transformer and the voltage regulator; when the switching test device is in the power-on state, the output voltage of the voltage source is adjusted by the voltage regulator so that the voltage at the capacitor forcing device and the overall branch voltage meet the corresponding requirements.

[0022] Furthermore, the voltage is adjusted as follows: adjust the voltage regulator so that the voltage across the capacitor compensation device reaches the working voltage of the capacitor compensation device itself; when the voltage across the capacitor compensation device reaches the working voltage of the capacitor compensation device itself, continue to adjust the voltage regulator so that the overall circuit voltage reaches the test required voltage; when the test is completed, adjust the voltage regulator so that the voltage of the switched test branch drops to zero.

[0023] Furthermore, the damping resistor module includes a plurality of resistors connected in series and parallel. Such a resistor module configuration not only allows the resistance value to be flexibly controlled, but also increases the power of the resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an electrical schematic diagram of a switching test device in an embodiment of a switching test device for a capacitor compensation device of the present invention;

[0025] Figure 2 It is a simulation circuit diagram of the switching test device in the embodiment of the switching test method of the capacitor compensation device of the present invention;

[0026] Figure 3a Schematic diagram of simulation results of the test circuit voltage at the time when the capacitor compensation device is switched on in an embodiment of the switching test method of the capacitor compensation device of the present invention;

[0027] Figure 3b Schematic diagram of simulation results of the test loop current at the time when the capacitor compensation device is switched on in an embodiment of the switching test method of the capacitor compensation device of the present invention;

[0028] Figure 4a Schematic diagram of simulation results of the test circuit voltage at the time of cutting off the capacitor compensation device in an embodiment of the switching test method of the capacitor compensation device of the present invention;

[0029] Figure 4b Schematic diagram of simulation results of the test loop current at the time of cutting off the capacitor compensation device in an embodiment of the switching test method of the capacitor compensation device of the present invention;

[0030] Figure 5a Schematic diagram of voltage simulation results of the entire test process in an embodiment of the switching test method of the capacitor compensation device of the present invention;

[0031] Figure 5b Schematic diagram of current simulation results of the entire test process in an embodiment of the switching test method of the capacitor compensation device of the present invention. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example of a switching test device for capacitor compensation device

[0034] This embodiment provides a technical solution for a switching test device for a capacitor compensation device. The switching test device includes a switching test branch, a voltage source and a measurement module. Figure 1 The voltage source is connected to the switching test branch and is used to supply power to each module arranged on the switching test branch. The switching test branch is provided with a reactor module, a capacitor module and a damping resistor module.

[0035] The capacitor module includes multiple capacitors for simulating substation filter capacitors. In this embodiment, Figure 1 As shown, the capacitor module includes capacitors C1 and C2, and each capacitor corresponds to a different lead-out connector, which is used to connect to both ends of the capacitor strengthening device, so that the capacitor strengthening device is connected in parallel with the corresponding capacitor; Figure 1 For example, the low-voltage end lead connector of capacitor C2 is connected to the low-voltage end of the capacitor strengthening device, and the high-voltage end of capacitor C2 is connected to the high-voltage end of the capacitor strengthening device TO through the damping resistor module R (the damping resistor module R can also be connected to the low-voltage end of capacitor C2, or connected to both ends of capacitor C2 at the same time without affecting the damping effect). Then the capacitor strengthening device TO is connected in parallel with the branch after the capacitor C2 and the damping resistor module R are connected in series. Since the individual capacitors in the capacitor module are small in size and the capacitance value combinations are variable, the capacitance value can be flexibly adjusted by increasing or decreasing the number of capacitors connected in parallel with the capacitor strengthening device.

[0036] Damping resistor module corresponding Figure 1 The damping resistor R in the circuit puts the circuit in an overdamped state, rapidly attenuating the free component in the circuit during the transient process; the damping resistor module can be composed of a plurality of rod-shaped resistors connected in series and parallel, which not only allows the resistance value to be flexibly controlled, but also increases the power of the resistor.

[0037] In this embodiment, the reactor module is an air-core reactor, corresponding to Figure 1 The reactor L in the circuit is used to provide inductive voltage for the switching test circuit. Based on the actual conditions of the laboratory, a 130mH air-core reactor was selected. Due to the large inductance of the reactor, it can provide sufficient inductive voltage for the system. After the forced compensation device is put into operation, the voltage across the capacitor has a significant jump compared to that before the forced compensation device is put into operation. In other words, the change in voltage across the capacitor before and after the forced compensation device is put into operation is more obvious, making it easier to observe and accurately distinguish the status of the forced compensation device being put into operation and removed.

[0038] The measurement module is used to collect information on various measurement parameters to determine whether the capacitor forcing device can be normally put into operation and removed based on the changes in each measurement parameter. For example, when the forcing device is put into the test circuit to bypass the capacitor connected in parallel with the capacitor forcing device, the measurement module determines the changes in each measurement parameter to determine whether the capacitor forcing device can be normally put into operation. If the total voltage U2 (Ea) of the capacitor module increases, while the total voltage U3 (Ec) of the capacitor forcing device decreases, and the current Ib of the capacitor group C1 and the current Ic of the capacitor forcing device TO increase and overlap, then the capacitor forcing device has been normally put into operation. When the forcing device is removed from the test circuit to put the capacitor connected in parallel with the capacitor forcing device into the test circuit, the measurement module determines the changes in each measurement parameter to determine whether the capacitor forcing device can be normally removed. If the total voltage U2 (Ea) of the capacitor module decreases, while the total voltage U3 (Ec) of the capacitor forcing device increases, and the current Ib of the capacitor group C1 and the current Ic of the capacitor forcing device TO decrease to the state before the forcing device is put into operation, then the capacitor forcing device has been normally removed.

[0039] In this embodiment, the measurement module includes a voltage sensor for collecting the voltage at the output of the voltage regulator, a voltage sensor for collecting the total voltage of the capacitor module, a voltage sensor for collecting the total voltage of the capacitor compensation device, and a current sensor for collecting the total current in the switching test branch. The parameters collected by each sensor and the collection position correspond to Figure 1 In a preferred embodiment, the measurement module includes a high-speed data acquisition system, a high-voltage probe, and a current loop, which are used to collect the voltage U1 at the output of the voltage regulator, the total voltage U2 of the capacitor module, the total voltage U3 of the capacitor compensation device, and the total current I1 in the switching test branch.

[0040] In this embodiment, the voltage source of the device is provided with electric energy by the 10kV AC power grid, which is connected to the test circuit through the isolation transformer, switch cabinet and voltage regulator. That is, the power supply is directly adopted from the laboratory AC power grid with a rated voltage of 10kV, and there is no need to add a separate test transformer. Figure 1As shown, the dotted box represents the overall voltage source, and the voltage source is connected to the reactor module (reactor L), the capacitor module (capacitors C1, C2), the damping resistor module (damping resistor R), the measurement module (only the positions corresponding to the sensor acquisition U1, U2, U3 and I1 are shown in the figure) and the capacitor compensation device TO, which is used to supply power to each module and simulate the substation bus voltage for the capacitor compensation device, that is, to simulate the reactive compensation working environment of the capacitor compensation device; in this embodiment, the voltage source can be used to power the sensors in the measurement module. In other embodiments, these sensors can also be powered by other external power supplies.

[0041] The switch cabinet is used to close the circuit after the test starts, so that the test device is energized; the voltage regulator is used to adjust the voltage when the switching test device is in the power-on state, so that the voltage at the capacitor compensation device and the overall circuit voltage meet the corresponding requirements: when the test starts, the voltage regulator is adjusted after the test device is energized so that the voltage across the capacitor compensation device reaches the operating voltage of the IGCT driver board of the main body; when the power indicator light of the IGCT driver board of the capacitor compensation device lights up, continue to adjust the voltage regulator so that the system voltage reaches the test requirement voltage; when the test is over, adjust the voltage regulator to drop the system voltage to zero and open the switch cabinet.

[0042] Figure 2 The figure shows the simulation circuit of the switching test device mentioned above, in which the names of the components are marked in the figure. The damping resistor module R in the figure does not show the specific internal connection relationship, and is directly replaced by an equivalent resistor.

[0043] Example of a test method for switching on and off a capacitor compensation device

[0044] This embodiment provides a technical solution for a method for testing the switching of a capacitor compensation device, and the steps are as follows:

[0045] 1) Connecting the capacitor compensation device to be tested to a switching test device, which includes a switching test branch, a voltage source, and a measurement module. The voltage source is connected to the switching test branch to power each module provided on the switching test branch. The switching test branch is provided with a reactor module, a capacitor module, and a damping resistor module. The capacitor module includes multiple capacitors for simulating substation filter capacitors. Each capacitor corresponds to a different lead-out connector. An equivalent impedance RL is added in parallel with the capacitor bank to act as other resistance and inductance components in the equivalent substation.

[0046] The specific connection method is: connect the two ends of the capacitance compensating device to be tested to the lead-out connectors corresponding to the capacitors in the capacitor module, so that the capacitance compensating device is connected in parallel with the corresponding capacitors; in this embodiment, the two ends of the capacitance compensating device are connected to the two ends of the capacitor C2 and the damping resistor R in series, so that the capacitance compensating device TO is connected in parallel with the capacitor C2 and the damping resistor R; because the individual capacitors in the capacitor module are small in size and the capacitance value combinations are variable, the capacitance value can be flexibly adjusted by increasing or decreasing the number of capacitors connected in parallel with the capacitance compensating device.

[0047] The voltage source is provided by a 10kV AC power grid and is connected to the test system through an isolation transformer, a switch cabinet, and a voltage regulator; that is, the power supply is directly provided by a laboratory AC power grid with a rated voltage of 10kV, and there is no need to add a separate test transformer; the voltage source is connected to the reactor module, the capacitor module, the damping resistor module, the measurement module and the capacitor compensation device TO, and is used to supply power to each module and simulate the substation bus voltage for the capacitor compensation device, that is, to simulate the reactive compensation working environment of the capacitor compensation device; in this embodiment, the voltage source can be used to power the sensors in the measurement module. In other embodiments, these sensors can also be powered by other external power supplies.

[0048] The reactor module (i.e., reactor L) uses a hollow dry-type reactor. Based on the existing conditions in the laboratory, a 384mH hollow reactor was selected. Due to the large inductance value of the reactor, it can provide sufficient inductive voltage for the system. After the strong compensation device is put into operation, the voltage across the capacitor has a significant jump compared to before the strong compensation device is put into operation. In other words, the change in the voltage across the capacitor before and after the strong compensation device is put into operation is more obvious, making it easier to observe and accurately distinguish the states of the strong compensation device being put into operation and removed.

[0049] The capacitor module includes multiple capacitors for simulating substation filter capacitors. The capacitor module includes capacitors C1 and C2, which correspond to different lead-out connectors. C1 and C2 are composed of multiple 550μF, 2000Vrms capacitors connected in series. C1 includes 10 capacitors and C2 includes 30 capacitors.

[0050] The damping resistor module R uses nine 50Ω / 600W rod resistors connected in a 3-in-3 series arrangement. This not only allows for flexible control of the resistance value but also increases the power of the resistor (in the circuit diagram, only one equivalent resistor R is used to represent the 3-in-3 series resistor module).

[0051] The equivalent impedance RL consists of a 200mH reactor and a 180Ω resistor in parallel, which acts as the other resistance and inductance components in the equivalent substation;

[0052] Each probe of the measuring system corresponds to the voltage sensor for collecting the voltage at the output of the voltage regulator, the voltage sensor for collecting the total voltage of the capacitor module, the voltage sensor for collecting the total voltage of the capacitor compensation device, and the current sensor for collecting the total current in the switching test branch. Figure 1 The positions of U1, U2, U3 and I1, Ib, Ic are arranged. The voltage sensors all use 20kV high-voltage probes, and the current sensors use 300A current loops, which are connected to the high-speed data acquisition device through optocoupler isolators.

[0053] 2) The switching test device is powered on, and the reactor module, capacitor module, damping resistor module and measurement module are powered by a voltage source, and the substation bus voltage is simulated by the voltage source; when performing the switching test, the measurement module collects information on various measurement parameters to determine whether the capacitor compensation device can be normally switched on and off.

[0054] At the start of the test, the switch cabinet is closed to energize the test device. The voltage regulator is adjusted to slowly increase the voltage until the power indicator of the IGCT driver board of the capacitor compensation device lights up. The voltage and current values measured by the high-speed data acquisition are observed.

[0055] Continue to boost the voltage. When the total voltage reaches about 5kVrms, control the capacitor compensation device IGCT to conduct, put the compensation device into the test circuit, bypass the capacitor connected in parallel with the capacitor compensation device, and use the measurement module to determine the changes in various measurement parameters to determine whether the capacitor compensation device can be put into operation normally.

[0056] After 1 second, the IGCT is turned off, the capacitor compensation device is removed from the test circuit, and the capacitor connected in parallel with the capacitor compensation device is put into the test circuit. The measurement module is used to determine the changes in various measurement parameters to determine whether the capacitor compensation device can be removed normally.

[0057] When the test is completed, adjust the voltage regulator so that the voltage of the switching test branch drops to zero, the switch cabinet is opened and grounded, and the device loses power.

[0058] The simulation results of the above test method are as follows Figure 3a-Figure 5b As shown, where Ea is the total capacitor voltage, Eb is the voltage of capacitor C1, Ec is the voltage of capacitance strengthening device TO, Ib is the current of capacitor C1, and Ic is the current of capacitance strengthening device TO; Figure 3a and Figure 3b The simulation results of voltage and current at each location when the capacitor compensation device is put into use are shown respectively. Figure 3a and Figure 3b It can be seen that the total voltage of the capacitor is increased and the current of the capacitor strengthening device is increased, indicating that the capacitor strengthening device is successfully put into use; Figure 4a and Figure 4bThe simulation results of voltage and current at each location when the capacitor compensation device is removed are shown respectively. Figure 4a and Figure 4b It can be seen that the total voltage of the capacitor decreases and the current of the capacitor compensation device drops to zero, indicating that the capacitor compensation device is successfully removed; Figure 5a and Figure 5b They are the voltage and current simulation results at various points in the entire test process.

[0059] The characteristics of the present invention are: by providing a capacitor module including multiple capacitors and lead-out connectors corresponding to different capacitors, it is possible to connect the capacitor forcing device through the lead-out connector when configuring the test circuit, and flexibly select the capacitance value in parallel with the capacitor forcing device, thereby simulating different substation filter capacitor working conditions; and, the present invention also improves the flexibility of simulating substation damping and voltage working conditions respectively through the series-parallel combination of damping resistor modules and voltage regulators, and can use the same test circuit to simulate the working environment of the capacitor forcing device under various conditions, thereby improving the overall applicability of the test device. The use of a reactor with a larger inductance value also makes the change in the voltage across the capacitor more obvious before and after the forcing device is put into operation, making it easier to observe and accurately distinguish the state of the forcing device being put into operation and removed.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A switching test device for a capacitor compensation device, characterized in that: It includes a switching test branch, a voltage source and a measurement module. The voltage source is connected to the switching test branch and is used to supply power to each module arranged on the switching test branch. The switching test branch is provided with a reactor module, a capacitor module and a damping resistor module. The capacitor module includes multiple capacitors for simulating the substation filter capacitor; each capacitor corresponds to a different lead-out connector, and the lead-out connector is used to be connected to both ends of a capacitor forcing device, so that the capacitor forcing device is connected in parallel with the corresponding capacitor; or, the lead-out connector is used to be connected to one end of the capacitor forcing device and is also used to be connected to the other end of the capacitor forcing device through a damping resistor module, so that the capacitor forcing device is connected in parallel with the branch after the corresponding capacitor and the damping resistor module are connected in series; or, the lead-out connector is used to be connected to both ends of the capacitor forcing device through a damping resistor module, so that the capacitor forcing device is connected in parallel with the branch after the corresponding capacitor and the damping resistor module are connected in series; The measuring module is used to collect information of various measurement parameters, so as to judge whether the capacitor strengthening device can be normally put into operation and removed according to the changes of the various measurement parameters.

2. The switching test device for capacitor compensation device according to claim 1, characterized in that: The voltage source includes an AC power grid, an isolation transformer and a voltage regulator. The AC power grid is connected to the switching test branch through the isolation transformer and the voltage regulator; the voltage regulator is used to adjust the output voltage of the voltage source when the switching test device is in the power-on state, so that the voltage at the capacitor compensation device and the overall circuit voltage meet the corresponding requirements.

3. The switching test device for capacitor compensation device according to claim 1 or 2, characterized in that: The damping resistor module includes a plurality of resistors connected in series and parallel.

4. The switching test device for capacitor compensation device according to claim 2, characterized in that: The measuring module includes: a voltage sensor for collecting the voltage at the output end of the voltage regulator, a voltage sensor for collecting the total voltage of the capacitor module, a voltage sensor for collecting the total voltage of the capacitor compensation device, and a current sensor for collecting the total current in the switching test branch.

5. The switching test device for capacitor compensation device according to claim 1 or 2, characterized in that: The reactor module is an air-core reactor, which is used to provide an inductive voltage for the switching test device.

6. A switching test method for a capacitor compensation device, characterized in that: Here are the steps: 1) Connecting the capacitor compensation device to be tested to a switching test device, the switching test device comprising a switching test branch, a voltage source, and a measurement module, the voltage source being connected to the switching test branch for supplying power to each module provided on the switching test branch, the switching test branch being provided with a reactor module, a capacitor module, and a damping resistor module, the capacitor module comprising a plurality of capacitors for simulating a substation filter capacitor; each capacitor corresponding to a different lead-out connector; The connection method is as follows: connecting the two ends of the capacitance compensating device to be measured to the lead-out connectors corresponding to the capacitors in the capacitor module, so that the capacitance compensating device and the corresponding capacitors are connected in parallel; or connecting one end of the capacitance compensating device to be measured to the lead-out connector corresponding to the capacitors in the capacitor module, and the other end to the lead-out connector corresponding to the capacitors in the capacitor module through the damping resistor module, so that the capacitance compensating device and the branch formed by the series connection of the corresponding capacitor and the damping resistor module are connected in parallel; or connecting the two ends of the capacitance compensating device to be measured to the lead-out connectors corresponding to the capacitors in the capacitor module through the damping resistor module, so that the capacitance compensating device and the branch formed by the series connection of the corresponding capacitor and the damping resistor module are connected in parallel; 2) The switching test device is powered on, and the reactor module, capacitor module, damping resistor module and measurement module are powered by a voltage source, and the substation bus voltage is simulated by the voltage source; when performing the switching test, the measurement module collects information on various measurement parameters to determine whether the capacitor compensation device can be normally switched on and off.

7. The switching test method of the capacitor compensation device according to claim 6, characterized in that: The process of conducting the switching test is as follows: Put the capacitor compensation device into the test circuit, bypass the capacitor connected in parallel with the capacitor compensation device, and use the measurement module to determine the changes in various measurement parameters to determine whether the capacitor compensation device can be put into operation normally; Cut off the capacitance strengthening device from the test circuit, put the capacitor connected in parallel with the capacitance strengthening device into the test circuit, determine the changes of various measurement parameters through the measurement module, and judge whether the capacitance strengthening device can be cut off normally.

8. The switching test method of the capacitor compensation device according to claim 6 or 7, characterized in that: The voltage source includes an AC power grid, an isolation transformer and a voltage regulator. The AC power grid is connected to the switching test branch through the isolation transformer and the voltage regulator. When the switching test device is in the power-on state, the output voltage of the voltage source is adjusted by the voltage regulator so that the voltage at the capacitor compensation device and the overall branch voltage meet the corresponding requirements.

9. The switching test method of the capacitor compensation device according to claim 8, characterized in that: The method of adjusting the voltage is as follows: adjust the voltage regulator so that the voltage across the capacitor compensation device reaches the working voltage of the capacitor compensation device itself; when the voltage across the capacitor compensation device reaches the working voltage of the capacitor compensation device itself, continue to adjust the voltage regulator so that the overall voltage of the circuit reaches the test required voltage; when the test is completed, adjust the voltage regulator so that the voltage of the switching test branch drops to zero.

10. The switching test method of the capacitor compensation device according to claim 6 or 7, characterized in that: The damping resistor module includes a plurality of resistors connected in series and parallel.

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