CN106997012B - Converter valve steady-state operation test device and method adopting capacitor to bear bias voltage - Google Patents
Converter valve steady-state operation test device and method adopting capacitor to bear bias voltage Download PDFInfo
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Abstract
The invention provides a steady-state operation test device and a steady-state operation test method for a converter valve adopting a capacitor to bear bias voltage, wherein the device comprises a sample valve 1, a sample valve 2, a capacitor CL, a transformer T1, a circulation suppression reactor L01, a switch K01 and an alternating current test power supply S0. One end of the sample valve 1 and one end of the sample valve 2 are connected with the ground, the other end of the sample valve is connected with two sides of the circulation suppression reactor L01 respectively, one end of the secondary winding of the transformer T1 is grounded after being connected with the capacitor CL in series, the other end of the secondary winding of the transformer T1 is connected with any one end of the circulation suppression reactor L01 in series, and the primary winding of the transformer T1 is connected with the switch K01 in series and then connected with the alternating current test power supply S0. The capacitor connected in series in the loop is used for bearing direct-current voltage components between the converter valve ends, the test system is charged and supplemented by means of a common transformer, a direct-current power supply is not required to be configured, and an additional energy supplementing valve is not required. The transformer can be simply realized by a low-power single-phase transformer or a voltage regulator, and the main loop is simple and reliable.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission and power electronic application, in particular to a device and a method for testing steady-state operation of a converter valve by adopting a capacitor to bear bias voltage.
Background
The flexible direct current transmission system based on the MMC voltage source converter has the excellent performances of supplying power to a passive system or a weak alternating current system, controlling the active power and the reactive power rapidly and independently, being easy to form a multi-terminal network, being environment-friendly and the like, and the harmonic content of the transmission voltage of the MMC-HVDC system is extremely low, and no additional filter is required to be configured, so that the flexible direct current transmission based on the MMC has wide application prospect in the field of power transmission. The MMC-HVDC core component power unit module is the minimum unit of the whole flexible direct-current transmission converter valve, the power unit module forms a valve section, and 6 bridge arms of the converter valve are formed by the valve section.
The reliability of the converter valve directly determines the reliability of the flexible direct current transmission system. In order to ensure that the converter valve can reliably operate under various working conditions of the flexible direct current transmission system, the IEC standard prescribes a type test on the valve section of the converter valve, wherein the type test comprises a steady-state operation test. The method is an indispensable important link in the design link of the flexible direct current transmission engineering, and is an important guarantee of the safe, stable and durable operation of the whole flexible direct current system in the later period.
According to the requirements of actual operation conditions and the specifications of IEC standards, during a test, the voltage at both ends of the converter valve generally comprises a direct-current voltage component and an alternating-current voltage component, and in a typical design, the direct-current voltage component corresponds to half of the rated voltage of the valve section, and the amplitude of the alternating-current voltage component is approximately equal to half of the rated voltage of the valve section. In order to supply power to the valve section and simultaneously generate the required direct-current voltage component, all methods disclosed at present rely on a high-voltage direct-current power supply or an additional converter valve, so that the test cost is obviously increased.
The method in the Chinese patent with publication number CN105372586A, namely a flexible direct current transmission voltage source converter valve operation test device, requires an additional high-voltage direct current rectifying power supply and an additional energy supplementing bridge arm, obviously increases the cost of the test device, and is complicated to control because of asymmetrical systems.
The Chinese patent with publication number of CN106546852A, namely an MMC converter valve steady-state operation test circuit and a control method thereof, requires two extra soft bridge arms to supplement energy, and simultaneously requires a high-voltage direct current rectifying power supply to supply power, thereby obviously increasing test cost.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a steady-state operation test device and a steady-state operation test method for a converter valve, which adopt a capacitor to bear bias voltage, fully utilize the capacitor connected in series in a loop to bear direct-current voltage components between converter valve ends, charge and supplement energy to a test system by means of a common transformer, and do not need to be provided with a direct-current power supply or an additional energy supplementing valve. The required transformer can be simply realized by a low-power single-phase transformer or a voltage regulator, and the main loop is simple and reliable.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the steady-state operation test device for the converter valve adopting the capacitor to bear the bias voltage comprises a sample valve 1, a sample valve 2, a capacitor CL, a transformer T1, a circulation suppression reactor L01, a switch K01 and an alternating current test power supply S0.
One end of the sample valve 1 and one end of the sample valve 2 are connected with the ground, the other end of the sample valve is connected with two sides of the circulation suppression reactor L01 respectively, one end of the secondary winding of the transformer T1 is grounded after being connected with the capacitor CL in series, the other end of the secondary winding of the transformer T1 is connected with any one end of the circulation suppression reactor L01 in series, and the primary winding of the transformer T1 is connected with the switch K01 in series and then connected with the alternating current test power supply S0.
The transformer T1 can adopt a voltage regulator, and the test circuit is charged by slow voltage regulation of the voltage regulator in the test process.
A charging resistor R can be connected in series between the transformer T1 and the switch K01, and a bypass switch K02 is connected in parallel to the charging resistor R, so that the test circuit is charged through the charging resistor and the bypass switch during the test.
Two circulation suppression reactances L01 and L02 can be adopted to enable the two sample valves to be arranged in a balanced way, and the connection mode is as follows: the test valve 1 and the test valve 2 are connected to one end and grounded, the other end is connected in series with the loop-suppressing reactance L01 and L02, the secondary winding of the transformer T1 is connected in series with the capacitor CL, and one end is grounded, and the other end is connected to the midpoint of the loop-suppressing reactance L01 and L02.
A test method of a converter valve steady-state operation test device adopting a capacitor to bear bias voltage comprises the following steps:
(1) When the cell capacitor voltages in the sample valve are not established, they need to be charged, and two charging methods are selectable: charging by using a voltage regulator T1 and charging by using a charging resistor R and a charging resistor bypass switch K02;
(2) A method for alternately charging the capacitor and the sample valve in the charging process by adopting an alternating current test power supply;
(3) The method for bearing the direct-current voltage component between the valve ends of the test sample by using the capacitor CL comprises the following steps: because the AC transformer is externally connected, the voltage at two ends of the AC transformer is power frequency alternating current, a capacitor connected in series with the secondary side of the transformer bears the direct current voltage component between the valve ends of the test sample, and the AC transformer generates the alternating current voltage component between the valve ends of the test sample;
(4) In the test process, when the direct-current voltage component between the ends of the sample valve needs to be regulated, the modulation signal of the sample valve needs to be regulated slowly to ensure that the direct-current voltage component between the ends of the sample valve is changed slowly, so that the voltage on the series capacitor CL can follow the direct-current voltage component between the ends of the sample valve, and the inrush current generated in the transformer winding due to the voltage difference is avoided, therefore, in the direct-current voltage component change process of the sample valve, the voltage on the capacitor CL is also changed simultaneously, the balance between the total voltage on the sample valve and the capacitor CL and the power supply voltage is kept, and the energy supplementing of the alternating-current power supply to the sample valve is realized;
(5) In the test process, the modulation signals of the sample valve 1 and the sample valve 2 are controlled so that the current in the sample valve meets the requirement; and controlling the modulation signals of the energy supplementing valve to balance the capacitance and the voltage in the energy supplementing valve, the sample valve 1 and the sample valve 2 and meet the test requirement.
The method for charging by using the voltage regulator T1 comprises the following steps:
step one, firstly, regulating a voltage regulator T1 to output zero voltage, and closing K01;
step two, slowly rising the output voltage of the voltage regulator T1, wherein the sample valve, the series capacitor CL and the secondary winding of the transformer are connected in series, if the sample valve consists of a half-bridge unit, the sample valve is charged in the positive half wave of the alternating current power supply, and the series capacitor CL is charged in the negative half wave of the alternating current power supply; if the sample valve consists of a full-bridge unit, the unit is charged by the current of positive and negative half waves of an alternating current power supply; if the sample valve is formed by mixing a half-bridge unit and a full-bridge unit, charging all the units by current in the positive half-wave of an alternating current power supply, and charging the full-bridge unit and a series capacitor in the negative half-wave of the alternating current power supply by current;
and step three, waiting for the voltage regulator to rise to the specified voltage, and ending the charging, wherein the voltage of the bridge arm capacitor on the test sample valve is equal to the peak voltage of the alternating current power supply plus the voltage on the series capacitor CL, so that the test can be started.
The method for charging by using the charging resistor R and the charging resistor bypass switch K02 comprises the following steps:
firstly, closing K01, and starting to charge a sample valve and a series capacitor CL;
step two, because the sample valve, the series capacitor CL and the secondary winding of the transformer are connected in series, if the sample valve consists of a half-bridge unit, the sample valve is charged in the positive half-wave of the alternating current power supply, and the series capacitor CL is charged in the negative half-wave of the alternating current power supply; if the sample valve consists of a full-bridge unit, the unit is charged by the current of positive and negative half waves of an alternating current power supply; if the sample valve is formed by mixing a half-bridge unit and a full-bridge unit, charging all the units by current in the positive half-wave of an alternating current power supply, and charging the full-bridge unit and a series capacitor in the negative half-wave of the alternating current power supply by current;
step three, after the voltage of the charging end unit is stabilized, closing a charging resistor bypass switch K01; the test can be started by adding the voltage of the series capacitor CL to the sum of the bridge arm capacitor voltage on the test valve and the peak voltage of the ac power supply.
The test method also comprises the following steps: in the test process, a required test current flows through the test sample valve 1, the test sample valve 2 and the loop current suppression reactance L01; the generation of the test current depends on the different generation of the debugging signals of the sample valve 1 and the sample valve 2; in a typical test situation, the modulation waves of the sample valve 1 and the sample valve 2 are given as sinusoidal signals, and the amplitude and the frequency of the sinusoidal signals are equal and differ by a small angle; therefore, the circulating current suppressing reactors in the middle of the sample valve 1 and the sample valve 2 bear the difference of the voltages of the two, so that sinusoidal circulating currents with the same frequency are generated; the small capacitance voltage difference between the two sample valves can lead to direct current components on the circulation suppression reactor; the sinusoidal circulation and the direct current component combine the required test current.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the steady-state operation test device and method for the converter valve adopting the capacitor to bear the bias voltage, disclosed by the invention, the capacitor connected in series in the loop is fully utilized to bear the direct-current voltage component between the converter valve ends, the test system is charged and supplemented by means of a common transformer, a direct-current power supply is not required to be configured, and an additional energy supplementing valve is not required. The required transformer can be simply realized by a low-power single-phase transformer or a voltage regulator, and the main loop is simple and reliable.
2. The device and the method for testing the steady-state operation of the converter valve adopting the capacitor to bear the bias voltage can adopt two charging methods of charging by using the charging resistor R and the charging resistor bypass switch K02 and charging by using the voltage regulator T1, and the charging current can be regulated stably in the charging process by adopting the voltage regulator for charging.
3. According to the steady-state operation test device and method for the converter valve adopting the alternating-current test power supply, in the test process, when the direct-current voltage component between the ends of the test sample valve is required to be regulated, the modulation signal of the test sample valve is regulated slowly, the direct-current voltage component between the ends of the test sample valve is ensured to change slowly, so that the voltage on the series capacitor CL can follow the direct-current voltage component between the ends of the test sample valve, and the inrush current generated in the transformer winding due to the voltage difference is avoided, and therefore, the voltage on the capacitor CL also changes simultaneously in the process of changing the direct-current voltage component of the test sample valve, and the balance between the total voltage on the test sample valve and the power supply voltage is maintained, so that the energy supplementing of the alternating-current power supply to the test sample valve is realized.
Drawings
FIG. 1 is a topological structure diagram of a steady-state operation test device for a converter valve according to the present invention;
FIG. 2 is a topology diagram of an operating test device employing a voltage regulator to control a charging process in accordance with the present invention;
FIG. 3 is a topological structure diagram of an operation test device employing a charging resistor to control a charging process according to the present invention;
FIG. 4 is a topological structure diagram of a fully symmetrical operation test device for two sample valves of the present invention;
FIG. 5 is a schematic diagram of a half-bridge power cell module circuit of the present invention;
fig. 6 is a schematic diagram of a full bridge power cell module circuit of the present invention.
Detailed Description
The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.
As shown in fig. 1, the steady-state operation test device for the converter valve adopting a capacitor to bear bias voltage comprises a sample valve 1, a sample valve 2, a capacitor CL, a transformer T1, a circulation suppression reactor L01, a switch K01 and an alternating current test power supply S0.
One end of the sample valve 1 and one end of the sample valve 2 are connected with the ground, the other end of the sample valve is connected with two sides of the circulation suppression reactor L01 respectively, one end of the secondary winding of the transformer T1 is grounded after being connected with the capacitor CL in series, the other end of the secondary winding of the transformer T1 is connected with any one end of the circulation suppression reactor L01 in series, and the primary winding of the transformer T1 is connected with the switch K01 in series and then connected with the alternating current test power supply S0.
As shown in fig. 2, the transformer T1 may employ a voltage regulator, and the test circuit is charged by slow voltage regulation of the voltage regulator during the test.
As shown in fig. 3, a charging resistor R may be connected in series between the transformer T1 and the switch K01, and a bypass switch K02 may be connected in parallel to the charging resistor R, so that the test circuit is charged through the charging resistor and the bypass switch during the test.
As shown in fig. 4, two circulation suppression reactances L01 and L02 may also be used to balance the two sample valves, and the connection manner is: the test valve 1 and the test valve 2 are connected to one end and grounded, the other end is connected in series with the loop-suppressing reactance L01 and L02, the secondary winding of the transformer T1 is connected in series with the capacitor CL, and one end is grounded, and the other end is connected to the midpoint of the loop-suppressing reactance L01 and L02.
The test sample valve section of the test device is formed by cascading one or more power unit modules, wherein each power unit sub-module can be a half-bridge unit sub-module as shown in fig. 5 or a full-bridge unit sub-module as shown in fig. 6. The half-bridge unit sub-module comprises two IGBTs, a diode, a capacitor, a discharge resistor, a power unit module main control board and the like; the full-bridge unit sub-module comprises four IGBTs, diodes, capacitors, discharge resistors, a power unit module main control board and the like. The switching-on and switching-off of the IGBT in the triggering sub-module is controlled to control the switching-on and switching-off of the power unit sub-module, so that the valve end can output the required voltage.
A test method of a converter valve steady-state operation test device adopting a capacitor to bear bias voltage comprises the following steps:
(1) When the cell capacitor voltages in the sample valve are not established, they need to be charged, and two charging methods are selectable: charging by using a voltage regulator T1 and charging by using a charging resistor R and a charging resistor bypass switch K02;
(2) A method for alternately charging the capacitor and the sample valve in the charging process by adopting an alternating current test power supply;
(3) The method for bearing the direct-current voltage component between the valve ends of the test sample by using the capacitor CL comprises the following steps: because the AC transformer is externally connected, the voltage at two ends of the AC transformer is power frequency alternating current, a capacitor connected in series with the secondary side of the transformer bears the direct current voltage component between the valve ends of the test sample, and the AC transformer generates the alternating current voltage component between the valve ends of the test sample;
(4) In the test process, when the direct-current voltage component between the ends of the sample valve needs to be regulated, the modulation signal of the sample valve needs to be regulated slowly to ensure that the direct-current voltage component between the ends of the sample valve is changed slowly, so that the voltage on the series capacitor CL can follow the direct-current voltage component between the ends of the sample valve, and the inrush current generated in the transformer winding due to the voltage difference is avoided, therefore, in the direct-current voltage component change process of the sample valve, the voltage on the capacitor CL is also changed simultaneously, the balance between the total voltage on the sample valve and the capacitor CL and the power supply voltage is kept, and the energy supplementing of the alternating-current power supply to the sample valve is realized;
(5) In the test process, the modulation signals of the sample valve 1 and the sample valve 2 are controlled so that the current in the sample valve meets the requirement; and controlling the modulation signals of the energy supplementing valve to balance the capacitance and the voltage in the energy supplementing valve, the sample valve 1 and the sample valve 2 and meet the test requirement.
The method for charging by using the voltage regulator T1 comprises the following steps:
step one, firstly, regulating a voltage regulator T1 to output zero voltage, and closing K01;
step two, slowly rising the output voltage of the voltage regulator T1, wherein the sample valve, the series capacitor CL and the secondary winding of the transformer are connected in series, if the sample valve consists of a half-bridge unit, the sample valve is charged in the positive half wave of the alternating current power supply, and the series capacitor CL is charged in the negative half wave of the alternating current power supply; if the sample valve consists of a full-bridge unit, the unit is charged by the current of positive and negative half waves of an alternating current power supply; if the sample valve is formed by mixing a half-bridge unit and a full-bridge unit, charging all the units by current in the positive half-wave of an alternating current power supply, and charging the full-bridge unit and a series capacitor in the negative half-wave of the alternating current power supply by current;
and step three, waiting for the voltage regulator to rise to the specified voltage, and ending the charging, wherein the voltage of the bridge arm capacitor on the test sample valve is equal to the peak voltage of the alternating current power supply plus the voltage on the series capacitor CL, so that the test can be started.
The method for charging by using the charging resistor R and the charging resistor bypass switch K02 comprises the following steps:
firstly, closing K01, and starting to charge a sample valve and a series capacitor CL;
step two, because the sample valve, the series capacitor CL and the secondary winding of the transformer are connected in series, if the sample valve consists of a half-bridge unit, the sample valve is charged in the positive half-wave of the alternating current power supply, and the series capacitor CL is charged in the negative half-wave of the alternating current power supply; if the sample valve consists of a full-bridge unit, the unit is charged by the current of positive and negative half waves of an alternating current power supply; if the sample valve is formed by mixing a half-bridge unit and a full-bridge unit, charging all the units by current in the positive half-wave of an alternating current power supply, and charging the full-bridge unit and a series capacitor in the negative half-wave of the alternating current power supply by current;
step three, after the voltage of the charging end unit is stabilized, closing a charging resistor bypass switch K01; the test can be started by adding the voltage of the series capacitor CL to the sum of the bridge arm capacitor voltage on the test valve and the peak voltage of the ac power supply.
The test method also comprises the following steps: in the test process, a required test current flows through the test sample valve 1, the test sample valve 2 and the loop current suppression reactance L01; the generation of the test current depends on the different generation of the debugging signals of the sample valve 1 and the sample valve 2; in a typical test situation, the modulation waves of the sample valve 1 and the sample valve 2 are given as sinusoidal signals, and the amplitude and the frequency of the sinusoidal signals are equal and differ by a small angle; therefore, the circulating current suppressing reactors in the middle of the sample valve 1 and the sample valve 2 bear the difference of the voltages of the two, so that sinusoidal circulating currents with the same frequency are generated; the small capacitance voltage difference between the two sample valves can lead to direct current components on the circulation suppression reactor; the sinusoidal circulation and the direct current component combine the required test current.
In the test apparatus, an operation current required for the test, including an ac component and a dc component, flows through the sample valve 1, the sample valve 2, and the loop-suppressing reactance L01. In the test process, the modulation signals of the sample valve 1 and the sample valve 2 are controlled so that the current in the sample valve meets the requirement; and regulating the secondary side voltage of the transformer to ensure that the internal direct current voltage of the sample valve meets the test requirement.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (2)
1. The test method of the converter valve steady-state operation test device adopting the capacitor to bear the bias voltage comprises a test valve 1, a test valve 2, a capacitor CL, a voltage regulator T1, a circulation suppression reactor L01, a switch K01 and an alternating current test power supply S0;
one end of the sample valve 1 and one end of the sample valve 2 are connected with the ground, the other end of the sample valve is respectively connected with two sides of the circulation suppression reactor L01, one end of the secondary winding of the voltage regulator T1 is grounded after being connected with the capacitor CL in series, the other end of the secondary winding of the voltage regulator T1 is connected with any one end of the circulation suppression reactor L01, and the primary winding of the voltage regulator T1 is connected with the switch K01 in series and then connected with the alternating current test power supply S0;
a charging resistor R is connected in series between the voltage regulator T1 and the switch K01, and a bypass switch K02 is connected in parallel with the charging resistor R, so that the test circuit is charged through the charging resistor R and the bypass switch K02 in the test process;
the test method is characterized by comprising the following steps:
(1) When the cell capacitor voltages in the sample valve 1 and the sample valve 2 are not established, the cell capacitor voltages need to be charged by the following charging method: charging with the voltage regulator T1 and charging with the charging resistor R and the bypass switch K02;
(2) Alternating current test power supply S0 is adopted, and the capacitor CL, the sample valve 1 and the sample valve 2 are alternately charged in the charging process;
(3) The capacitor CL is used to bear the direct current voltage component between the sample valve 1 and the sample valve 2: because the voltage regulator T1 is externally connected, the voltage at two ends of the voltage regulator T1 is power frequency alternating current, a capacitor CL connected in series with the secondary side of the voltage regulator T1 bears direct current voltage components between the sample valve 1 and the sample valve 2, and the voltage regulator T1 generates alternating current voltage components between the sample valve 1 and the sample valve 2;
(4) In the test process, when the direct-current voltage components between the sample valve 1 and the sample valve 2 are regulated, the modulation signals of the sample valve 1 and the sample valve 2 are slowly regulated, so that the direct-current voltage components between the ends of the sample valve 1 and the sample valve 2 are ensured to be slowly changed, the voltage on the capacitor CL can follow the direct-current voltage components between the ends of the sample valve 1 and the sample valve 2, and the inrush current generated in the winding of the voltage regulator T1 due to the voltage difference is avoided, so that the voltage on the capacitor CL is also changed simultaneously in the direct-current voltage component change process of the sample valve 1 and the sample valve 2, and the total voltage and the power voltage on the capacitor CL are kept balanced, thereby the energy supplementing of the alternating-current power supply to the sample valve 1 and the sample valve 2 is also realized;
(5) In the test process, the modulation signals of the sample valve 1 and the sample valve 2 are controlled so that the currents in the sample valve 1 and the sample valve 2 meet the requirements;
the method for charging by using the voltage regulator T1 comprises the following steps:
step one, firstly, regulating the voltage regulator T1 to output zero voltage, and closing the switch K01;
step two, the output voltage of the voltage regulator T1 is slowly risen, and as the sample valve 1 and the sample valve 2 are connected in series with the capacitor CL and the secondary winding of the voltage regulator T1, if the sample valve 1 and the sample valve 2 are composed of half-bridge units, the sample valve 1 and the sample valve 2 are charged in the positive half-wave of an alternating current power supply, and the capacitor CL is charged in the negative half-wave of the alternating current power supply; if the sample valve 1 and the sample valve 2 are composed of full-bridge units, the unit is charged by the current through positive and negative half waves of an alternating current power supply; if the sample valve 1 and the sample valve 2 are formed by mixing half-bridge units and full-bridge units, in the positive half-wave of an alternating current power supply, current charges all units, and in the negative half-wave of the alternating current power supply, current charges the full-bridge units and a capacitor CL;
step three, waiting for the voltage regulator T1 to rise to a specified voltage, and ending the charging, wherein the bridge arm capacitance voltage sum of the sample valve 1 and the sample valve 2 is equal to the peak voltage of an alternating current power supply plus the voltage of a capacitor CL, and starting a test;
the method for charging by using the charging resistor R and the bypass switch K02 comprises the following steps:
firstly, closing a switch K01, and starting to charge a sample valve 1, a sample valve 2 and a capacitor CL;
step two, because the sample valve 1 and the sample valve 2 are connected in series with the capacitor CL and the secondary winding of the voltage regulator T1, if the sample valve 1 and the sample valve 2 are composed of half-bridge units, the sample valve 1 and the sample valve 2 are charged in the positive half-wave of an alternating current power supply, and the capacitor CL is charged in the negative half-wave of the alternating current power supply; if the sample valve 1 and the sample valve 2 are composed of full-bridge units, the unit is charged by the current through positive and negative half waves of an alternating current power supply; if the sample valve 1 and the sample valve 2 are formed by mixing half-bridge units and full-bridge units, in the positive half-wave of an alternating current power supply, current charges all the units, and in the negative half-wave of the alternating current power supply, current charges the full-bridge units and a series capacitor;
step three, after the voltage of the charging end unit is stabilized, closing a bypass switch K02; at this time, the voltage of the bridge arm capacitor on the sample valve 1 and the sample valve 2 is equal to the peak voltage of the alternating current power supply plus the voltage on the capacitor CL, and the test is started;
in the test process, a required test current flows through the test sample valve 1, the test sample valve 2 and the loop current suppression reactance L01; the generation of the test current depends on the different generation of the debugging signals of the sample valve 1 and the sample valve 2; the modulating waves of the sample valve 1 and the sample valve 2 are given as sinusoidal signals, and the amplitude and the frequency of the modulating waves are equal and differ by a small angle; therefore, the loop-current suppressing reactance L01 between the sample valve 1 and the sample valve 2 will bear the difference of the voltages of the two, thereby generating a sine loop current with the same frequency; the small capacitance voltage difference between the two sample valves causes direct current components on the circulation suppression reactor; the sinusoidal circulation and the direct current component combine the required test current.
2. The test method of a steady-state operation test device for a converter valve adopting a capacitor to bear bias voltage according to claim 1, wherein two circulation suppression reactances L01 and L02 are adopted to enable two sample valves to be arranged in a balanced manner, and the connection mode is as follows: one end of the sample valve 1 and one end of the sample valve 2 are connected to the ground, the other end of the sample valve is connected in series with the circulation suppression reactance L01 and L02, after the secondary winding of the voltage regulator T1 is connected in series with the capacitor CL, one end of the sample valve is grounded, and the other end of the sample valve is connected to the midpoint of the circulation suppression reactance L01 and L02.
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| CN111551844B (en) * | 2020-05-06 | 2021-04-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Flexible direct current converter valve type test device and method |
| CN111650504B (en) * | 2020-06-05 | 2022-12-09 | 全球能源互联网研究院有限公司 | Circuit and method for simulating switching-on and switching-off voltage of converter valve |
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