阅读说明：本技术 一种换流阀均压电极结垢试验用电源装置 (Converter valve voltage-sharing electrode power supply device for scaling test ) 是由 梁家豪 张朝辉 何平 王慧泉 黄永瑞 苏杰和 陶敏 韩坤 毕延河 李志伟 于 2020-04-24 设计创作，主要内容包括：本发明的目的是提供一种换流阀均压电极结垢试验用电源装置,用于对试验系统中的换流阀提供实际运行过程中等效的电压,且幅值、极性均可调节,包括单相整流单元、逆变调压单元、电压类型变换单元,通过设置由两个单向晶闸管和两个二极管组成的整流桥和起滤波作用的电容构成的单相整流单元、由4个IGCT组成的逆变器和变压器构成的逆变调压单元、由双向晶闸管和电容构成的电源类型变换单元所组成的电源装置,当交流电经过整流桥和电容后转变为平稳的直流电,经过逆变器后变为交流电,通过变压器对电压进行调节并输出至电源类型变换单元,控制系统通过施加正向触发脉冲或负向触发脉冲来控制out1与out2之间产生正极性电压或负极性电压。(The invention aims to provide a power supply device for a converter valve voltage-sharing electrode scaling test, which is used for providing equivalent voltage in the actual operation process for a converter valve in a test system, and the amplitude and the polarity of the equivalent voltage can be adjusted, and comprises a single-phase rectification unit, an inversion voltage regulation unit and a voltage type conversion unit, wherein the single-phase rectification unit is composed of a rectification bridge consisting of two unidirectional thyristors and two diodes and a capacitor playing a filtering role, the inversion voltage regulation unit is composed of an inverter consisting of 4 IGCTs and a transformer, and the power supply device is composed of a power supply type conversion unit consisting of a bidirectional thyristor and a capacitor, when alternating current passes through the rectification bridge and the capacitor, the alternating current is converted into stable direct current, the stable direct current passes through the inverter, the stable direct current is regulated by the transformer and is output to the power supply type conversion unit, and the control system controls positive polarity voltage or negative polarity voltage to be generated between out1 and out2 by applying positive trigger pulse .)

1. The utility model provides a converter valve voltage-sharing electrode power supply unit for scale deposit test, includes alternating current power supply, converter valve, its characterized in that still includes: the utility model provides a voltage type transform unit for being used for filtering the alternating current rectification for the direct current and to the voltage that flows through to the whole single-phase rectification unit that has the regulation output voltage, be used for turning into the direct current of single-phase rectification unit output into the alternating current and adjust output voltage's contravariant voltage regulating unit, be used for turning into the alternating current of contravariant voltage regulating unit output into the direct current of different polarity and adjustable output voltage, the output and the input of single-phase rectification unit of power are connected, the output of single-phase rectification unit is connected with the input of contravariant voltage regulating unit, the output of contravariant voltage regulating unit is connected with the input of voltage transform unit, the output of voltage transform unit has been connected with the input of converter.

2. The power supply device for the converter valve voltage-sharing electrode scaling test according to claim 1, is characterized in that: the single-phase rectification unit comprises a rectification bridge and a capacitor C1, wherein the rectification bridge consists of a unidirectional thyristor SCR1, a unidirectional thyristor SCR2, a diode D1 and a diode D2, the capacitor C1 plays a role in filtering, the cathode of the thyristor SCR1 is connected with the cathode of a thyristor SCR2, the anode of the thyristor SCR2 is connected with the cathode of the diode D2, the anode of a diode D2 is connected with the anode of the diode D1, the cathode of a diode D1 is connected with the anode of the thyristor SCR1, the L pole of the power supply is connected between the cathode of a diode D1 and the anode of the thyristor SCR1, the N pole of the power supply is connected between the anode of the thyristor SCR2 and the cathode of the diode D2, the output end of the rectification bridge is connected with the input end of the capacitor C1, and the output end of the single-phase rectification.

3. The power supply device for the converter valve voltage-sharing electrode scaling test according to claim 2, is characterized in that: the contravariant voltage regulating unit includes inverter, the transformer of constituteing by 4 IGCTs, the inverter includes IGCT1, IGCT2, IGCT3, IGCT4, IGCT 1's negative pole is connected with IGCT 3's positive pole, IGCT 2's negative pole is connected with IGCT 4's positive pole, IGCT 1's positive pole is connected with IGCT 2's positive pole, IGCT 3's negative pole is connected the back with IGCT 4's negative pole and is connected with single-phase rectifier unit's input respectively, the primary coil of transformer is connected with the output of inverter, the secondary coil of transformer is connected with voltage transformation unit's input.

4. The power supply device for the converter valve voltage-sharing electrode scaling test according to claim 3, is characterized in that: the voltage conversion unit comprises a bidirectional thyristor TRIAC and a capacitor C2, one end of the bidirectional thyristor TRIAC is connected with the output end of the transformer, the other end of the bidirectional thyristor TRIAC is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other output end of the transformer, an output line out1 is led out from the other end of the bidirectional thyristor TRIAC, an output line out2 is led out from the other end of the capacitor C2, and a ground wire is led out from the other output end of the transformer.

5. The power supply device for the converter valve voltage-sharing electrode scaling test according to claim 4, is characterized in that: the control system is used for controlling the single-phase rectification unit, the inversion voltage regulation unit and the voltage type conversion unit, and the output end of the control system is connected with the input ends of the single-phase rectification unit, the inversion voltage regulation unit and the voltage type conversion unit respectively.

Technical Field

The invention belongs to the field of converter valve voltage-sharing electrode scaling, and particularly relates to a power supply device for a converter valve voltage-sharing electrode scaling test.

Background

At present, flexible direct-current transmission projects based on voltage source converters and conventional direct-current transmission projects based on current source converters are rapidly developed at home and abroad. The converter is a core device in the direct current transmission process, and in order to ensure normal operation, the converter valve is usually cooled by deionized water, and voltage-sharing electrodes are arranged in a water cooling system.

Engineering operation experience shows that the converter valve voltage-sharing electrode is in the environments of electricity, water, high temperature and the like for a long time, and due to the electrochemical corrosion effect of an aluminum radiator in the converter valve, scale can be formed on the surface of the voltage-sharing electrode, so that the safe operation of the converter valve is seriously influenced. At present, the formation mechanism of the scaling of the voltage equalizing electrode and an effective method for preventing the scaling are still in the research stage. In order to search the scaling reason and the scaling forming process of the voltage-sharing electrode as soon as possible, a set of test system which comprises the voltage-sharing electrode of the converter valve and is equivalent to the actual engineering working condition is built in a laboratory, and the scaling mechanism of the voltage-sharing electrode is explored by using an experimental means.

In actual operation, different converter valves bear different working voltages and different polarities, for example, some converter valves bear high voltage, some converter valves bear low voltage, some converter valves bear direct current with positive voltage, some converter valves bear direct current with negative voltage, and the existing commonly-used 220V alternating current cannot meet the power supply requirement of a test system, so that a power supply module of the test system can output voltage equivalent to that in the actual operation process of the converter valves, the amplitude and the polarity can be adjusted, and a power supply device capable of outputting voltage equivalent to that in the actual operation process of the converter valves and adjustable in amplitude and polarity is an important component of the system.

Disclosure of Invention

The invention aims to provide a power supply device for a converter valve voltage-sharing electrode scaling test, which is used for providing equivalent voltage in the actual operation process for a converter valve in a test system, and the amplitude and the polarity of the equivalent voltage can be adjusted.

The technical scheme for solving the technical problems of the invention is as follows: a power supply device for a converter valve voltage-sharing electrode scaling test comprises an alternating current power supply and a converter valve, and is characterized by also comprising a single-phase rectification unit, an inversion voltage-regulating unit and a voltage type conversion unit, wherein the single-phase rectification unit is used for rectifying alternating current into direct current and filtering the voltage flowing through the single-phase rectification unit and is provided with an output voltage regulation function, the inversion voltage-regulating unit is used for converting the direct current output by the single-phase rectification unit into alternating current and regulating the output voltage, the voltage type conversion unit is used for converting the alternating current output by the inversion voltage-regulating unit into direct, the output end of the power supply is connected with the input end of the single-phase rectification unit, the output end of the single-phase rectification unit is connected with the input end of the inversion voltage-regulating unit, the output end of the inversion voltage regulating unit is connected with the input end of the voltage transformation unit, and the output end of the voltage transformation unit is connected with the input end of the converter valve.

In order to rectify the alternating current outputted from the alternating current power supply into smooth direct current, the single-phase rectification unit comprises a rectification bridge consisting of a unidirectional thyristor SCR1, a unidirectional thyristor SCR2, a diode D1 and a diode D2, and a capacitor C1 for filtering, the cathode of the thyristor SCR1 is connected with the cathode of the thyristor SCR2, the anode of the thyristor SCR2 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the anode of the thyristor SCR1, the L-pole of the power supply is connected between the cathode of diode D1 and the anode of thyristor SCR1, the N-pole of the power supply is connected between the anode of the thyristor SCR2 and the cathode of diode D2, the output end of the rectifier bridge is connected with the input end of a capacitor C1, the two ends of the capacitor C1 are output ends, and the output end of the capacitor C1 is connected with the input end of the inversion voltage regulating unit 2.

In order to change the voltage amplitude after converting the direct current output by the single-phase rectification unit into alternating current, the inversion voltage regulation unit comprises an inverter and a transformer, wherein the inverter consists of 4 IGCTs, the inverter comprises an IGCT1, an IGCT2, an IGCT3 and an IGCT4, the cathode of the IGCT1 is connected with the anode of the IGCT3, the cathode of the IGCT2 is connected with the anode of the IGCT4, the anode of the IGCT1 is connected with the anode of the IGCT2, the cathode of the IGCT3 is connected with the cathode of the IGCT4 and then respectively connected with the input end of the single-phase rectification unit, the primary coil of the transformer is connected with the output end of the inverter, and the secondary coil of the transformer is connected with the input end of the voltage conversion unit.

In order to convert the alternating current output by the inversion voltage regulating unit into direct current with different polarities and change the output voltage, the voltage conversion unit comprises a TRIAC and a capacitor C2, one end of the TRIAC is connected with the output end of the transformer, the other end of the TRIAC is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other output end of the transformer, an output line out1 is led out of the other end of the TRIAC, an output line out2 is led out of the other end of the capacitor C2, and a ground line is led out of the other output end of the transformer.

The control system is used for controlling the single-phase rectification unit, the inversion voltage regulation unit and the voltage type conversion unit, the output end of the control system is respectively connected with the input ends of the single-phase rectification unit, the inversion voltage regulation unit and the voltage type conversion unit, and the control system is used for controlling the trigger angles of the unidirectional thyristor SCR1 and the unidirectional thyristor SCR2 in the single-phase rectification unit, the switch-off trigger angles of the IGCT1, the IGCT2, the IGCT3 and the IGCT4 in the inversion voltage regulation unit and the trigger angle of the bidirectional thyristor TRIAC.

The invention has the beneficial effects that: the power supply device comprises a single-phase rectifying unit, an inverter and a voltage regulating unit, wherein the single-phase rectifying unit comprises a rectifying bridge consisting of two unidirectional thyristors and two diodes and a capacitor C1 with a filtering effect, the inverter comprises 4 IGCTs and a transformer, the inverter comprises a bidirectional thyristor and a capacitor C2, and the power supply device comprises a power supply type conversion unit.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present invention includes an ac power source, a converter valve, and is characterized by further including a single-phase rectification unit 1 for rectifying ac power into dc power and filtering the rectified voltage and having an output voltage regulated, an inverter voltage regulation unit 2 for converting the dc power outputted from the single-phase rectification unit 1 into ac power and regulating the output voltage, a voltage type conversion unit 3 for converting the ac power outputted from the inverter voltage regulation unit 2 into dc power of different polarities and regulating the output voltage, the output end of the power supply is connected with the input end of the single-phase rectification unit 1, the output end of the single-phase rectification unit 1 is connected with the input end of the inversion voltage-regulating unit 2, the output end of the inversion voltage regulating unit 2 is connected with the input end of the voltage transformation unit, and the output end of the voltage transformation unit is connected with the input end of the converter valve.

In order to rectify the alternating current outputted from the alternating current power source into smooth direct current, the single-phase rectification unit 1 includes a rectification bridge composed of a unidirectional thyristor SCR1, a unidirectional thyristor SCR2, a diode D1 and a diode D2, and a capacitor C1 for filtering, the cathode of the thyristor SCR1 is connected with the cathode of the thyristor SCR2, the anode of the thyristor SCR2 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the anode of the thyristor SCR1, the L-pole of the power supply is connected between the cathode of diode D1 and the anode of thyristor SCR1, the N-pole of the power supply is connected between the anode of the thyristor SCR2 and the cathode of diode D2, the output end of the rectifier bridge is connected with the input end of a capacitor C1, the two ends of the capacitor C1 are output ends, and the output end of the capacitor C1 is connected with the input end of the inversion voltage regulating unit 2.

In order to change the voltage amplitude after converting the direct current output by the single-phase rectification unit into alternating current, the inversion voltage regulation unit comprises an inverter and a transformer, wherein the inverter consists of 4 IGCTs, the inverter comprises an IGCT1, an IGCT2, an IGCT3 and an IGCT4, the cathode of the IGCT1 is connected with the anode of the IGCT3, the cathode of the IGCT2 is connected with the anode of the IGCT4, the anode of the IGCT1 is connected with the anode of the IGCT2, the cathode of the IGCT3 is connected with the cathode of the IGCT4 and then respectively connected with the input end of the single-phase rectification unit, the primary coil of the transformer is connected with the output end of the inverter, and the secondary coil of the transformer is connected with the input end of the voltage conversion unit.

In order to convert the alternating current output by the inversion voltage regulating unit into direct current with different polarities and change the output voltage, the voltage conversion unit comprises a TRIAC and a capacitor C2, one end of the TRIAC is connected with the output end of the transformer, the other end of the TRIAC is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other output end of the transformer, an output line out1 is led out of the other end of the TRIAC, an output line out2 is led out of the other end of the capacitor C2, and a ground line is led out of the other output end of the transformer.

The control system is used for controlling the single-phase rectification unit 1, the inversion voltage regulation unit 2 and the voltage type conversion unit 3, the output end of the control system is respectively connected with the input ends of the single-phase rectification unit 1, the inversion voltage regulation unit 2 and the voltage type conversion unit 3, and the control system is used for controlling the trigger angle of the unidirectional thyristor SCR1 and the unidirectional thyristor SCR2 in the single-phase rectification unit 1, the turn-off and trigger angle of the IGCT1, the IGCT2, the IGCT3 and the IGCT4 in the inversion voltage regulation unit 2 and the trigger angle of the bidirectional thyristor TRIAC.

In the actual operation process, alternating current firstly passes through the single-phase rectification unit 1, and is changed into stable direct current after passing through a rectification bridge consisting of a unidirectional thyristor SCR1, a unidirectional thyristor SCR2, a diode D1 and a diode D2 in the single-phase rectification unit 1 and a capacitor C1 playing a filtering role, and a control system adjusts the trigger angles of the unidirectional thyristor SCR1 and the unidirectional thyristor SCR2 through trigger pulses so as to adjust the voltage on the capacitor C1.

The direct current output by the single-phase rectification unit 1 is output to the inversion voltage regulating unit 2, and is changed into alternating current after passing through an inverter consisting of an IGCT1, an IGCT2, an IGCT3 and an IGCT4 in the inversion voltage regulating unit 2, and then is output to a transformer, the transformer regulates the voltage, and the control system regulates the voltage output to a primary coil by triggering pulses to regulate the IGCT1, the IGCT2, the IGCT3 and the IGCT 4.

The alternating current regulated by the transformer is output to the voltage type conversion unit 3 through the secondary coil of the transformer, when the power supply device needs to output the direct current with positive polarity, the control system applies a positive trigger pulse to the TRIAC, the positive current flows through the TRIAC to charge the capacitor C2, and finally positive voltage is generated at two ends of out1 and out2 of the voltage type conversion unit 3; when the power supply device needs to output negative-polarity direct current, the control system applies negative trigger pulse to the TRIAC, the negative current flows through the TRIAC to charge the capacitor C2, and finally negative-polarity voltage is generated at two ends of the out1 and the out2 of the voltage type conversion unit 3.

Although the transformer has the function of regulating voltage, the specification of the transformer is determined after the transformer is customized, and the control system can meet the experimental requirements by controlling the trigger angles of the unidirectional thyristor SCR1 and the unidirectional thyristor SCR2, the trigger angles of the IGCT1, the IGCT2, the IGCT3 and the IGCT4 and the trigger angle of the bidirectional thyristor TRIAC so as to have a larger regulation range on the amplitude of the voltage.

The power supply device comprises a single-phase rectifying unit, an inverter and a voltage regulating unit, wherein the single-phase rectifying unit comprises a rectifying bridge consisting of two unidirectional thyristors and two diodes and a capacitor C1 with a filtering effect, the inverter comprises 4 IGCTs and a transformer, the inverter comprises a bidirectional thyristor and a capacitor C2, and the power supply device comprises a power supply type conversion unit.