CN107748301B - Noise test loading circuit of high-voltage direct-current filter capacitor - Google Patents
Noise test loading circuit of high-voltage direct-current filter capacitor Download PDFInfo
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Abstract
The invention relates to a high-voltage direct-current filter capacitor noise test loading circuit which comprises a direct-current voltage loading module, a voltage feedback control module, a harmonic current loading module, a current feedback control module and a first reactor, wherein the voltage feedback control module is connected with the first reactor; the direct-current voltage loading module is connected with the first reactor, the high-voltage direct-current filter capacitor and the voltage feedback control module; the first reactor is connected with the high-voltage direct-current filter capacitor and the voltage feedback control module; the current feedback control module is connected with the high-voltage direct-current filter capacitor and the harmonic current loading module. According to the high-voltage direct-current filter capacitor noise test loading circuit, direct-current voltage and harmonic current are synchronously loaded according to the actual working condition of direct-current engineering; the closed-loop control of the direct-current voltage and the harmonic current loaded by the high-voltage direct-current filter capacitor unit is realized, so that the direct-current voltage and the harmonic current loaded by the high-voltage direct-current filter capacitor unit can be maintained within target values.
Description
Technical Field
The invention relates to the field of high-voltage direct-current transmission, in particular to a noise test loading circuit of a high-voltage direct-current filter capacitor.
Background
With the development of the economy and the improvement of the living standard of people in China, the requirements of the China on environmental protection are improved year by year, and the influence of the running noise of the ultra-high voltage and extra-high voltage direct current converter stations on the surrounding environment is also more and more focused. The power capacitors in the ultra-high voltage and ultra-high voltage converter stations widely used for filtering and reactive compensation are main equipment for generating noise sources in the converter stations, particularly high-voltage direct current filter capacitors due to the large number and large capacity of the power capacitors.
At present, when the noise test is carried out on the high-voltage direct-current filter capacitor leaving the factory, the direct-current voltage and the harmonic current cannot be loaded at the same time according to the actual working condition of the direct-current engineering, so that a larger error exists in the noise test result.
Disclosure of Invention
Based on the problem that the direct current voltage and the harmonic current cannot be loaded simultaneously according to the actual working condition of the direct current engineering, the noise test loading circuit of the high-voltage direct current filter capacitor is needed to be provided.
The high-voltage direct-current filter capacitor noise test loading circuit comprises a direct-current voltage loading module, a voltage feedback control module, a harmonic current loading module, a current feedback control module and a first reactor;
A voltage end of the direct-current voltage loading module is connected with one end of the first reactor; the other end of the first reactor is connected with one end of the high-voltage direct-current filter capacitor and one end of the voltage feedback control module respectively; the other voltage end of the direct-current voltage loading module is respectively connected with the other end of the high-voltage direct-current filter capacitor and the other end of the voltage feedback control module; the signal receiving end of the direct-current voltage loading module is connected with the signal output end of the voltage feedback control module; one end of the current feedback control module is connected with the other end of the high-voltage direct-current filter capacitor; the other end of the current feedback control module is connected with the signal input end of the harmonic current loading module; an output end of the harmonic current loading module is connected with one end of the high-voltage direct-current filter capacitor; and the other output end of the harmonic current loading module is connected with the other end of the high-voltage direct-current filter capacitor.
In one embodiment, the high-voltage direct-current filter capacitor noise test loading circuit further comprises a first transformer and a blocking capacitor; one end of the blocking capacitor is connected with a first signal output end of the first transformer; the other end of the blocking capacitor is connected with one end of the high-voltage direct-current filter capacitor; the second signal output end of the first transformer is connected with the other end of the high-voltage direct-current filter capacitor; and two signal input ends of the first transformer are respectively connected with two output ends of the harmonic current loading module.
In one embodiment, the dc voltage loading module includes: an alternating current power supply, a second reactor, a second transformer and a first rectifying unit; one end of the alternating current power supply is connected with one end of the second reactor; the other end of the second reactor and the other end of the alternating current power supply are respectively connected with a first signal input end and a second signal input end of the second transformer; two signal output ends of the second transformer are respectively connected with two input ends of the first rectifying unit; the two output ends of the first rectifying unit are respectively used as two voltage ends of the direct-current voltage loading module.
In one embodiment, the harmonic current loading module comprises: the power supply unit comprises an alternating current power supply unit, a second rectifying unit, a direct current capacitor, a third reactor and an inversion unit; the output end of the alternating current power supply unit is connected with the input end of the second rectifying unit; an output end of the second rectifying unit is connected with one end of the third reactor; the other output end of the second rectifying unit is respectively connected with one end of the direct current capacitor and one input end of the inversion unit; the other end of the third reactor is respectively connected with the other input end of the inversion unit and the other end of the direct current capacitor; and two output ends of the inversion unit are respectively used as two output ends of the harmonic current loading module.
In one embodiment, the voltage feedback control module includes: a voltage divider and a first controller; the signal output end of the voltage divider is connected with one end of the first controller; one end of the voltage divider is connected with the other end of the first reactor; the other end of the voltage divider is connected with the other end of the high-voltage direct-current filter capacitor; the other end of the first controller is used as a signal output end of the voltage feedback control module.
In one embodiment, the current feedback control module comprises a transformer and a second controller; one end of the transformer is connected with the other end of the high-voltage direct-current filter capacitor; the other end of the transformer is connected with the signal input end of the harmonic current loading module through a second controller.
In one embodiment, the first rectifying unit includes: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier; the input end of the first controllable silicon is respectively connected with the first signal output end of the second transformer and the signal output end of the fourth controllable silicon; the output end of the first silicon controlled rectifier and the output end of the third silicon controlled rectifier are connected with one output end of the first rectifying unit; the input end of the third controllable silicon is respectively connected with the output end of the second controllable silicon and the second signal output end of the second transformer; and the signal input end of the fourth silicon controlled rectifier signal and the signal input end of the second silicon controlled rectifier are connected with the other output end of the first rectifying unit.
In one embodiment, the second rectifying unit includes: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode; the input end of the first diode and the output end of the fourth diode are respectively connected with the first phase voltage output end of the alternating current power supply unit; the input end of the third diode and the output end of the sixth diode are respectively connected with the second phase voltage output end of the alternating current power supply unit; the input end of the fifth diode and the output end of the second diode are respectively connected with the third phase voltage output end of the alternating current power supply unit; the output end of the first diode, the output end of the third diode and the output end of the fifth diode are all connected with one output end of the second rectifying unit; the output end of the fourth diode, the output end of the sixth diode and the output end of the second diode are all connected with the other output end of the second rectifying unit.
In one embodiment, the inverter unit includes: a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, and a fourth insulated gate bipolar transistor; the input end of the first insulated gate bipolar transistor is connected with the input end of the third insulated gate bipolar transistor; the output end of the second insulated gate bipolar transistor is connected with the output end of the fourth insulated gate bipolar transistor; the output end of the first insulated gate bipolar transistor and the input end of the fourth insulated gate bipolar transistor are connected with one output end of the inversion unit; the output end of the third insulated gate bipolar transistor and the input ends of the two insulated gate bipolar transistors are connected with the other output end of the inversion unit.
In one embodiment, the harmonic current loading module further comprises a fourth reactor; the output end of the first insulated gate bipolar transistor and the input end of the fourth insulated gate bipolar transistor are connected with one output end of the inversion unit through the fourth reactor.
The high-voltage direct-current filter capacitor noise test loading circuit synchronously loads direct-current voltage and harmonic current according to the actual working condition of direct-current engineering; the direct current voltage and the harmonic current loaded by the high-voltage direct current filter capacitor unit are subjected to closed-loop control through feedback control on the direct current voltage and the harmonic current, so that the loaded direct current voltage and harmonic current can be maintained within target values, and the target direct current voltage and harmonic current can be accurately loaded when the high-voltage direct current filter capacitor performs noise test, and the accuracy of a noise test result is ensured.
Drawings
FIG. 1 is a circuit diagram of a noise test loading circuit for a HVDC filter capacitor according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a DC voltage loading module according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a harmonic current loading module according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and the effects adopted by the present invention, the technical solutions of the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1, the high-voltage dc filter capacitor noise test loading circuit according to an embodiment includes a dc voltage loading module 10, a voltage feedback control module 20, a harmonic current loading module 30, a current feedback control module 40, and a first reactor L1; a voltage end (a end) of the direct-current voltage loading module 10 is connected with one end of the first reactor L1; the other end of the first reactor L1 is connected to one end of the high-voltage dc filter capacitor C1 and one end of the voltage feedback control module 20, respectively; the other voltage end (b end) of the direct-current voltage loading module 10 is respectively connected with the other end of the high-voltage direct-current filter capacitor C1 and the other end of the voltage feedback control module 20; the signal receiving end of the direct-current voltage loading module 10 is connected with the signal output end of the voltage feedback control module 20; one end of the current feedback control module 40 is connected with the other end of the high-voltage direct-current filter capacitor C1; the other end of the current feedback control module 40 is connected with the signal input end of the harmonic current loading module 30; an output end of the harmonic current loading module 30 is connected with one end of the high-voltage direct-current filter capacitor C1; the other output end of the harmonic current loading module 30 is connected with the other end of the high-voltage direct-current filter capacitor C1.
The high-voltage direct-current filter capacitor C1 is a test product and is consistent with the working state of the high-voltage direct-current filter capacitor in practical engineering application.
Preferably, the first reactor L1 is a smoothing reactor, which can reduce the ripple coefficient of the dc voltage output by the dc voltage loading module 10; meanwhile, since the smoothing reactor L1 presents a high impedance state at a high frequency, the harmonic current output by the harmonic current loading module 30 flows through the branch where the low-impedance high-voltage direct current filter capacitor C1 is located but does not flow to the branch where the smoothing reactor L1 is located, thereby avoiding the influence of the harmonic current on the direct current voltage loading module 10.
In one embodiment, the high-voltage direct-current filter capacitor noise test loading circuit further comprises a first transformer T1 and a blocking capacitor C2; one end of the blocking capacitor C2 is connected with a first signal output end of the first transformer T1; the other end of the blocking capacitor C2 is connected with one end of the high-voltage direct-current filter capacitor C1; the second signal output end of the first transformer T1 is connected with the other end of the high-voltage direct-current filter capacitor C1; the two signal inputs of the first transformer T1 are connected to the two outputs (c-terminal and d-terminal) of the harmonic current loading module 30, respectively.
Preferably, the first transformer T1 is an intermediate frequency transformer, and the working frequency range of the intermediate frequency transformer covers the frequency range of the main harmonic current of the high-voltage direct current filter capacitor C1, and after the low-voltage harmonic signal generated by the harmonic current loading module 30 is converted into the high-voltage harmonic signal, the high-voltage harmonic signal is loaded on the high-voltage direct current filter capacitor C1, so that the output voltage level of the harmonic current loading module 30 is reduced, and the cost is reduced; the dc blocking capacitor C2 can bear the dc voltage output by the dc voltage loading module 10, so as to avoid the problem that the dc voltage is directly loaded at two ends of the intermediate frequency transformer to cause the overcurrent of the intermediate frequency transformer. In addition, the parameters of the blocking capacitor C2 may be selected to be consistent with the parameters of the hvth filter capacitor C1.
As shown in fig. 2, fig. 2 is a circuit diagram of a dc voltage loading module according to an embodiment, including: an alternating current power source AC, a second reactor L2, a second transformer T2, and a first rectifying unit 110; one end of the alternating current power supply AC is connected with one end of the second reactor L2; the other end of the second reactor L2 and the other end of the alternating current power supply AC are respectively connected with a first signal input end and a second signal input end of the second transformer T2; two signal output ends of the second transformer T2 are respectively connected with two input ends of the first rectifying unit 110; the two output terminals of the first rectifying unit 110 are respectively used as the two voltage terminals of the dc voltage loading module 10.
After the alternating current power supply AC is connected with the second reactor L2 in series, the output alternating current voltage is increased through the second transformer T2; the boosted ac voltage is rectified into a dc voltage by the first rectifying unit 110; the alternating current power supply AC is a single-phase power frequency power supply, the second reactor L2 is a current limiting reactor, the second transformer T2 is a power frequency transformer, and the first rectifying unit 110 is a bridge rectifying unit composed of thyristors.
In another embodiment, the first rectifying unit 110 includes: the first silicon controlled rectifier G1, the second silicon controlled rectifier G2, the third silicon controlled rectifier G3 and the fourth silicon controlled rectifier G4; the input end of the first controllable silicon G1 is respectively connected with the first signal output end of the second transformer T2 and the signal output end of the fourth controllable silicon G4; the output end of the first silicon controlled rectifier G1 and the output end of the third silicon controlled rectifier G3 are connected with one output end of the first rectifying unit; the input end of the third controllable silicon G3 is respectively connected with the output end of the second controllable silicon G2 and the second signal output end of the second transformer T2; the signal input end of the fourth thyristor signal G4 and the signal input end of the second thyristor G2 are both connected to the other output end of the first rectifying unit 110.
In one embodiment, the voltage feedback control module 20 includes: a voltage divider PT and a controller a; the signal output end of the voltage divider PT is connected with one end of the controller A; one end of the voltage divider PT is connected with the other end of the first reactor L1; the other end of the voltage divider PT is connected with the other end of the high-voltage direct-current filter capacitor C1; the other end of the controller A is used as a signal output end of the voltage feedback control module 20.
Preferably, the voltage divider PT is a dc resistor-capacitor voltage divider, and is configured to measure dc voltages at two ends of the high-voltage dc filter capacitor C1, and feed back measured dc voltage signals to the controller a; after receiving the direct-current voltage signal fed back by the direct-current capacitive voltage divider, the controller A compares the fed-back direct-current voltage signal with a target direct-current voltage value and generates trigger signals for the thyristors G1, G2, G3 and G4, and the trigger angles of the thyristors G1, G2, G3 and G4 are controlled through the trigger signals, so that the direct-current voltage loaded at two ends of the high-voltage direct-current filter capacitor C1 is controlled within the target value.
As shown in fig. 3, fig. 3 is a circuit diagram of an embodiment harmonic current loading module, including: an alternating current power supply unit 310, a second rectifying unit 320, a direct current capacitor C3, a third reactor L3, and an inverter unit 330; the output end of the alternating current power supply unit 310 is connected with the input end of the second rectifying unit 320; an output end of the second rectifying unit 320 is connected to one end of the third reactor L3; the other output end of the second rectifying unit 320 is connected to one end of the dc capacitor C3 and one input end of the inverter unit 330, respectively; the other end of the third reactor L3 is respectively connected with the other input end of the inversion unit and the other end of the direct current capacitor; the two output terminals of the inverter unit 330 are respectively used as the two output terminals of the harmonic current loading module 30.
The ac power supply unit 310 outputs a 6-ripple dc voltage after passing through the second rectifying unit 320 composed of rectifying diodes. The 6-ripple dc voltage passes through the third reactor L3 to generate a dc voltage having a low ripple coefficient on the dc capacitor C3, the dc voltage having a value equal to the average voltage value output from the second rectifying unit 320. The dc voltage at both ends of the dc capacitor C3 is inverted into the harmonic voltage and the harmonic current to be supplied to the high-voltage dc filter capacitor C1 after passing through the inverter unit 330 composed of high-power electronics.
Preferably, the ac power supply unit 310 is a three-phase power frequency power supply Ua, ub, uc; the third reactor L3 is a filter reactor. The second rectifying unit 320 is composed of rectifying diodes; the inversion unit is composed of high-power electronic devices which can be Insulated Gate Bipolar Transistors (IGBT) or electronic devices (IEGT).
In another embodiment, the second rectifying unit includes: a first diode D11, a second diode D12, a third diode D21, a fourth diode D22, a fifth diode D31, and a sixth diode D32; the input end of the first diode D11 and the output end of the fourth diode D22 are respectively connected with the first phase voltage output end of the ac power supply unit 310; the input end of the third diode D21 and the output end of the sixth diode D32 are respectively connected with the second phase voltage output end of the ac power supply unit 310; the input end of the fifth diode D31 and the output end of the second diode D12 are respectively connected with the third phase voltage output end of the ac power supply unit 310; the output end of the first diode D11, the output end of the third diode D21, and the output end of the fifth diode D31 are all connected to an output end of the second rectifying unit 320; the output end of the fourth diode D22, the output end of the sixth diode D32, and the output end of the second diode D12 are all connected to the other output end of the second rectifying unit 320.
In another embodiment, the inverter unit includes: a first insulated gate bipolar transistor Q1, a second insulated gate bipolar transistor Q2, a third insulated gate bipolar transistor Q3, and a fourth insulated gate bipolar transistor Q4; the input end of the first insulated gate bipolar transistor is connected with the input end of the third insulated gate bipolar transistor; the output end of the second insulated gate bipolar transistor is connected with the output end of the fourth insulated gate bipolar transistor; the output end of the first insulated gate bipolar transistor and the input end of the fourth insulated gate bipolar transistor are connected with one output end of the inversion unit; the output end of the third insulated gate bipolar transistor and the input ends of the two insulated gate bipolar transistors are connected with the other output end of the inversion unit.
In one embodiment, the current feedback control module 40 includes a transformer CT and a controller B; one end of the transformer CT is connected with the other end of the high-voltage direct-current filter capacitor C1C 1; the other end of the transformer CT is connected with a signal input end of the harmonic current loading module 3030 through a controller B.
After receiving the harmonic current signal fed back by the current transformer CT, the controller B performs FFT decomposition on the harmonic current signal to obtain actually measured harmonic current values, compares the obtained harmonic current values with the harmonic current values of the target dc, generates trigger signals for controlling the high-power electronic devices Q1, Q2, Q3 and Q4, and controls the harmonic currents within the target value by loading the trigger signals at two ends of the high-voltage dc filter capacitor C1.
The high-voltage direct-current filter capacitor noise test loading circuit synchronously loads direct-current voltage and harmonic current according to the actual working condition of direct-current engineering; the direct current voltage and the harmonic current loaded by the high-voltage direct current filter capacitor unit are subjected to closed-loop control through feedback control on the direct current voltage and the harmonic current, so that the loaded direct current voltage and harmonic current can be maintained within target values, and the target direct current voltage and harmonic current can be accurately loaded when the high-voltage direct current filter capacitor performs noise test, and the accuracy of a noise test result is ensured.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The high-voltage direct-current filter capacitor noise test loading circuit is characterized by comprising a direct-current voltage loading module, a voltage feedback control module, a harmonic current loading module, a current feedback control module and a first reactor;
A voltage end of the direct-current voltage loading module is connected with one end of the first reactor; the other end of the first reactor is connected with one end of the high-voltage direct-current filter capacitor and one end of the voltage feedback control module respectively; the other voltage end of the direct-current voltage loading module is respectively connected with the other end of the high-voltage direct-current filter capacitor and the other end of the voltage feedback control module; the signal receiving end of the direct-current voltage loading module is connected with the signal output end of the voltage feedback control module; one end of the current feedback control module is connected with the other end of the high-voltage direct-current filter capacitor; the other end of the current feedback control module is connected with the signal input end of the harmonic current loading module; an output end of the harmonic current loading module is connected with one end of the high-voltage direct-current filter capacitor; the other output end of the harmonic current loading module is connected with the other end of the high-voltage direct-current filter capacitor;
The harmonic current loading module comprises: the power supply unit comprises an alternating current power supply unit, a second rectifying unit, a direct current capacitor, a third reactor and an inversion unit;
The output end of the alternating current power supply unit is connected with the input end of the second rectifying unit; an output end of the second rectifying unit is connected with one end of the third reactor; the other output end of the second rectifying unit is respectively connected with one end of the direct current capacitor and one input end of the inversion unit; the other end of the third reactor is respectively connected with the other input end of the inversion unit and the other end of the direct current capacitor; the two output ends of the inversion unit are respectively used as the two output ends of the harmonic current loading module;
The current feedback control module includes: a transformer and a second controller; one end of the transformer is connected with the other end of the high-voltage direct-current filter capacitor; the other end of the transformer is connected with the signal input end of the harmonic current loading module through a second controller.
2. The hvth filter capacitor noise test loading circuit of claim 1, further comprising a first transformer and a blocking capacitor;
one end of the blocking capacitor is connected with a first signal output end of the first transformer; the other end of the blocking capacitor is connected with one end of the high-voltage direct-current filter capacitor; the second signal output end of the first transformer is connected with the other end of the high-voltage direct-current filter capacitor; and two signal input ends of the first transformer are respectively connected with two output ends of the harmonic current loading module.
3. The high voltage dc filter capacitor noise test loading circuit of claim 1, wherein the dc voltage loading module comprises: an alternating current power supply, a second reactor, a second transformer and a first rectifying unit;
One end of the alternating current power supply is connected with one end of the second reactor; the other end of the second reactor and the other end of the alternating current power supply are respectively connected with a first signal input end and a second signal input end of the second transformer; two signal output ends of the second transformer are respectively connected with two input ends of the first rectifying unit; the two output ends of the first rectifying unit are respectively used as two voltage ends of the direct-current voltage loading module.
4. The hvth filter capacitor noise test loading circuit of claim 1, wherein the voltage feedback control module comprises: a voltage divider and a first controller; the signal output end of the voltage divider is connected with one end of the first controller; one end of the voltage divider is connected with the other end of the first reactor; the other end of the voltage divider is connected with the other end of the high-voltage direct-current filter capacitor; the other end of the first controller is used as a signal output end of the voltage feedback control module.
5. The hvth filter capacitor noise test loading circuit of claim 3, wherein the first rectifying unit comprises: the first silicon controlled rectifier, the second silicon controlled rectifier, the third silicon controlled rectifier and the fourth silicon controlled rectifier;
The input end of the first controllable silicon is respectively connected with the first signal output end of the second transformer and the signal output end of the fourth controllable silicon; the output end of the first silicon controlled rectifier and the output end of the third silicon controlled rectifier are connected with one output end of the first rectifying unit; the input end of the third controllable silicon is respectively connected with the output end of the second controllable silicon and the second signal output end of the second transformer; and the signal input end of the fourth silicon controlled rectifier signal and the signal input end of the second silicon controlled rectifier are connected with the other output end of the first rectifying unit.
6. The hvth filter capacitor noise test loading circuit of claim 1, wherein the second rectifying unit comprises: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode;
The input end of the first diode and the output end of the fourth diode are respectively connected with the first phase voltage output end of the alternating current power supply unit; the input end of the third diode and the output end of the sixth diode are respectively connected with the second phase voltage output end of the alternating current power supply unit; the input end of the fifth diode and the output end of the second diode are respectively connected with the third phase voltage output end of the alternating current power supply unit; the output end of the first diode, the output end of the third diode and the output end of the fifth diode are all connected with one output end of the second rectifying unit; the output end of the fourth diode, the output end of the sixth diode and the output end of the second diode are all connected with the other output end of the second rectifying unit.
7. The hvth filter capacitor noise test loading circuit of claim 1, wherein the inverter unit comprises: a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, and a fourth insulated gate bipolar transistor;
The input end of the first insulated gate bipolar transistor is connected with the input end of the third insulated gate bipolar transistor; the output end of the second insulated gate bipolar transistor is connected with the output end of the fourth insulated gate bipolar transistor; the output end of the first insulated gate bipolar transistor and the input end of the fourth insulated gate bipolar transistor are connected with one output end of the inversion unit; the output end of the third insulated gate bipolar transistor and the input ends of the two insulated gate bipolar transistors are connected with the other output end of the inversion unit.
8. The hvth filter capacitor noise test loading circuit of claim 7, wherein the harmonic current loading module further comprises a fourth reactor; the output end of the first insulated gate bipolar transistor and the input end of the fourth insulated gate bipolar transistor are connected with one output end of the inversion unit through the fourth reactor.
9. The high-voltage direct-current filter capacitor noise test loading circuit of claim 1, wherein the first reactor is a smoothing reactor for reducing a ripple coefficient of a direct-current voltage output by the direct-current voltage loading module.
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