CN103954893B - A kind of thyristor shunt detection circuit and detection method for voltage source converter - Google Patents

A kind of thyristor shunt detection circuit and detection method for voltage source converter Download PDF

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Publication number
CN103954893B
CN103954893B CN201410194146.4A CN201410194146A CN103954893B CN 103954893 B CN103954893 B CN 103954893B CN 201410194146 A CN201410194146 A CN 201410194146A CN 103954893 B CN103954893 B CN 103954893B
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thyristor
switch
bridge
power supply
resonant tank
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CN103954893A (en
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王轩
喻劲松
燕翚
王宇红
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China Electric Prime Technology Co., Ltd.
State Grid Corp of China SGCC
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CHINA ELECTRIC PRIME TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
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Abstract

The present invention relates to a kind of thyristor shunt detection circuit and detection method for voltage source converter, the circuit includes sequentially connected experiment power supply, DC power supply, charging circuit and the resonant tank connecting respectively with the thyristor tested device of voltage source converter and ground connection discharge loop;The resonant tank is for generating dash current.The method is:Disconnect the switch K of resonant tank2With the switch K of ground connection discharge loop3, upper down tube IGBT is in an off state always, and the thyristor in the bypass thyristor and resonant tank is all constantly in triggering state;It is closed the breaker of experiment power supply and the switch K of charging circuit1;Pressure regulator is adjusted, DC bus-bar voltage is made to reach requirement and charge for the capacitor C of resonant tank;After charging is stablized, the breaker of open test power supply and the switch K of charging circuit1;It is closed the switch K of resonant tank2.The present invention meets the requirement to examining half-bridge voltage source inverter thyristor to flow through dash current ability.

Description

A kind of thyristor shunt detection circuit and detection method for voltage source converter
Technical field:
The present invention relates to a kind of thyristor shunt detection circuit and detection methods, in particular to a kind of to be used for half-bridge structure The thyristor shunt detection circuit and detection method of voltage source converter.
Background technique:
Thyristor device is a kind of high voltage, powerful power semiconductor, it has, and capacity is big, high-efficient and control The advantages that property processed is good, is widely used in the circuits such as rectification, inversion, copped wave and the switch to electric energy, is that information industry and tradition produce Important interface between industry is the bridge between vulnerabilities scan and forceful electric power controlled device.
With the development of power electronics technology, based on as the device for high-power power electronic of the core component of HVDC The operational reliability of high-pressure series valve and the survival ability under various POWER SYSTEM STATEs are increasingly becoming one and are related to HVDC The critical issue that can be used widely in the power system.In order to improve the reliability of thyristor, have been carried out a large amount of Theoretical research work, but complete test is still raising and the final technological means for guaranteeing Thyristors in series valve reliability.
Overcurrent test be check valve in case of a fault, the ability of tolerance overcurrent, voltage and its related fuel factor.This Application reliable triggering thyristor for how in case of a fault, and investigate thyristor tolerance high current ability.
Summary of the invention:
The object of the present invention is to provide a kind of thyristor shunt detection circuit and detection method for voltage source converter, The present invention can satisfy the requirement to examining half-bridge voltage source inverter thyristor to flow through dash current ability.
To achieve the above object, the present invention uses following technical scheme:A kind of thyristor for voltage source converter point Current detection circuit, the circuit include sequentially connected experiment power supply, DC power supply, charging circuit and change respectively with voltage source Flow the resonant tank that the thyristor tested device of device is connected with ground connection discharge loop.
A kind of thyristor shunt for half-bridge structure voltage source converter provided by the invention protects circuit, the test Power supply includes low-pressure single-phase alternating current power supply or low-voltage three-phase AC power supply and the circuit breaker Q Z that connect with the power supply.
A kind of thyristor shunt detection circuit for voltage source converter provided by the invention, the DC power supply include Pressure regulator, transformer and the uncontrollable rectifier bridge being sequentially connected in series with the experiment power supply;The uncontrollable rectifier bridge is single-phase whole Flow bridge or three-phase rectification bridge.
Another preferred a kind of thyristor shunt detection circuit for voltage source converter provided by the invention, it is described to fill Circuit includes the charging resistor R1 and switch K1 being sequentially connected in series with the uncontrollable rectifier bridge output end.
Another preferred a kind of thyristor shunt detection circuit for voltage source converter provided by the invention, it is described humorous Vibration circuit include the capacitor C in parallel with the charge circuit, and the sequentially connected inductance L in described charging circuit one end, resistance R2, Thyristor and switch K2;The thyristor is to have greater than tested device thyristor I2T value and be greater than tested device thyristor pressure resistance Value;
The charging circuit is used to control the charging time of the capacitor C.
Another preferred a kind of thyristor shunt detection circuit for voltage source converter provided by the invention, the quilt Examination equipment includes the half-bridge voltage source inverter with the thyristor reverse parallel connection in the discharge loop, and the half-bridge voltage source is changed Stream device includes the half-bridge bridge arm that 2 IGBT are composed in series down tube, every IGBT and freewheeling diode reverse parallel connection;
Parallel connection direct capacitor between upper tube IGBT collector and down tube IGBT emitter, half-bridge bridge arm midpoint is under Submodule bypass thyristor in parallel between pipe IGBT emitter;The half-bridge bridge arm connects controller.
Another preferred a kind of thyristor shunt detection circuit for voltage source converter provided by the invention, it is described to connect Ground discharge loop include the switch K3 being connect with the capacitor C anode and with the concatenated discharge resistance R3 of the switch K3 and described Discharge resistance R3 ground connection.
A kind of detection method of detection circuit comprising above-mentioned technical proposal provided by the invention, it is characterised in that:Including Following steps:
(1) the switch K of resonant tank is disconnected2With the switch K of ground connection discharge loop3, upper down tube IGBT is off always State, the thyristor bypassed in thyristor and resonant tank are all constantly in triggering state;
(2) breaker of experiment power supply and the switch K of charging circuit are closed1
(3) pressure regulator is adjusted, DC bus-bar voltage is made to reach requirement and charge for the capacitor C of resonant tank;
(4) after charging reaches stable, the breaker of open test power supply and the switch K of charging circuit1
(5) it is closed the switch K of resonant tank2
A kind of detection method provided by the invention, the step (1) are powered on by half-bridge voltage source Converter controller, are enabled It generates trigger pulse, makes the brilliant lock in down tube IGBT in an off state always, bypass thyristor and charging and discharging circuit Pipe is all constantly in triggering state.
A kind of detection method provided by the invention, after detection, the switch K of closure ground connection discharge loop3, returned to resonance After capacitor C in road is substantially discharged, it is whether intact that each device in each thyristor and half-bridge voltage source inverter is detected respectively.
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, experimental rig structure of the invention is simple, and test method is simple and reliable;
2, power supply capacity needed for test of the invention is smaller;
3, the present invention can construct great dash current using lesser capacitance at lower voltages;
4, the present invention can simulate the failure of flexible direct current DC bus short circuit after UPFC, meet to inspection half-bridge voltage source Inverter thyristor flows through the requirement of dash current ability;
5, the half-bridge voltage source inverter in the present invention is for examining dash current whether sub- module bypass thyristor Generate adverse effect;
6, ground connection discharge loop after test for making capacitor C discharge, guarantee test safety.
Detailed description of the invention
Fig. 1 is electrical block diagram of the invention.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Figure 1, thyristor shunt protection circuit of the invention of this example for half-bridge structure voltage source converter includes Sequentially connected experiment power supply, DC power supply, charging circuit, resonant tank and tested device;The resonant tank is put with ground connection Electrical circuit connection.
The experiment power supply includes low-pressure single-phase alternating current power supply or low-voltage three-phase AC power supply and connect with the power supply Breaker.
The DC power supply includes the pressure regulator, transformer and uncontrollable rectifier being sequentially connected in series with the experiment power supply Bridge;The uncontrollable rectifier bridge is single-phase rectification bridge or three-phase rectification bridge.
The charging circuit includes the charging resistor R1 and switch being sequentially connected in series with the uncontrollable rectifier bridge output end K1。
The resonant tank includes the capacitor C in parallel with the charge circuit, is sequentially connected with described charging circuit one end Inductance L, resistance R2, thyristor and switch K2;The thyristor is to have greater than tested device thyristor I2T value and be greater than subject Equipment thyristor pressure voltage, the charging circuit are used to control the charging time of capacitor C.
The tested device includes the half-bridge voltage source inverter with the thyristor reverse parallel connection in the discharge loop, institute Stating half-bridge voltage source inverter includes the half-bridge bridge arm that 2 IGBT are composed in series down tube, every IGBT and two pole of afterflow Pipe reverse parallel connection;
Parallel connection direct capacitor between upper tube IGBT collector and down tube IGBT emitter, half-bridge bridge arm midpoint is under Submodule bypass thyristor in parallel between pipe IGBT emitter;The half-bridge bridge arm connects controller.
The ground connection discharge loop include the switch K3 being connect with the capacitor C anode and with the switch K3 is concatenated puts Resistance R3 and discharge resistance R3 ground connection.
The detection method of circuit comprising above-mentioned technical proposal is:
1) the switch K of resonant tank is disconnected2, ground connection discharge loop switch K3, on the Converter controller of half-bridge voltage source Electricity enables it generate trigger pulse, keeps down tube IGBT in an off state always, makes to bypass in thyristor and resonant tank Thyristor is all constantly in triggering state;
2) the circuit breaker Q Z of experiment power supply and the switch K of charging circuit are closed1
3) pressure regulator is adjusted, DC bus-bar voltage is made to reach requirement, is charged to the capacitor C of resonant tank;
4) after charging reaches stable, the circuit breaker Q Z of open test power supply and the switch K of charging circuit1
5) it is closed the switch K of resonant tank2, test starts;
6) after being completed, the switch K of closure ground connection discharge loop3, after capacitor is substantially discharged, all crystalline substances are detected respectively Whether each device is intact in brake tube and half-bridge voltage source inverter.
Wherein, resonant tank is for generating dash current, and thyristor is for examining the ability for flowing through dash current, half-bridge electricity Source Con-verters are for examining whether dash current can generate adverse effect to sub- module bypass thyristor.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent Pipe is described the invention in detail referring to above-described embodiment, those of ordinary skills in the art should understand that:Still may be used With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention Change or equivalent replacement, should all cover in present claims range.

Claims (4)

1. a kind of thyristor shunt detection circuit for half-bridge voltage source inverter, it is characterised in that:The detection circuit packet Sequentially connected experiment power supply, DC power supply, charging circuit, resonant tank, tested device are included, and in parallel with resonant tank is connect Ground discharge loop;
2 IGBT in the inverter of half-bridge voltage source in the tested device are composed in series the half-bridge bridge arm of down tube, and divide Not with 2 freewheeling diode reverse parallel connections;Parallel connection direct capacitor between upper tube IGBT collector and down tube IGBT emitter, institute State the thyristor V2 of tested device in parallel between half-bridge bridge arm midpoint and down tube IGBT emitter;The half-bridge bridge arm connection control Device;
The experiment power supply includes the low-pressure single-phase alternating current power supply or low-voltage three-phase AC power supply connecting with circuit breaker Q Z;
The DC power supply includes the pressure regulator being sequentially connected in series with the experiment power supply, transformer and uncontrollable rectifier bridge;Institute Stating uncontrollable rectifier bridge is single-phase rectification bridge or three-phase rectification bridge;
The charging circuit includes the charging resistor R1 and switch K1 being sequentially connected in series with the uncontrollable rectifier bridge output end;
The resonant tank includes the capacitor C in parallel with the charge circuit and the sequentially connected electricity in charging circuit one end Feel L, resistance R2, thyristor V1 and switch K2;The I of the thyristor V12T value is the I not less than tested device thyristor V22t Value;
The pressure voltage of the thyristor V1 is not less than the pressure voltage of tested device thyristor V2;The charging circuit is for controlling institute State the charging time of capacitor C.
2. a kind of thyristor shunt detection circuit for voltage source converter as described in claim 1, it is characterised in that:Institute State ground connection discharge loop include the switch K3 being connect with the capacitor C anode and with the concatenated discharge resistance R3 of the switch K3 and The discharge resistance R3 ground connection.
3. a kind of detection method of the thyristor shunt detection circuit for voltage source converter as claimed in claim 2, It is characterized in that:Include the following steps:
(1) the switch K of resonant tank is disconnected2With the switch K of ground connection discharge loop3, upper down tube IGBT is off always shape State, the thyristor V1 in the thyristor V2 and resonant tank of the tested device are constantly in triggering state;
(2) the circuit breaker Q Z of experiment power supply and the switch K of charging circuit are closed1
(3) pressure regulator is adjusted, DC bus-bar voltage is made to reach requirement and charge for the capacitor C of resonant tank;
(4) after charging reaches stable, the breaker of open test power supply and the switch K of charging circuit1
(5) it is closed the switch K2 of resonant tank;
(6) after detecting, the switch K of closure ground connection discharge loop3, after the capacitor C in resonant tank is substantially discharged, respectively Whether intact detect each device in each thyristor and half-bridge voltage source inverter.
4. method as claimed in claim 3, it is characterised in that:The step (1) passes through on the Converter controller of half-bridge voltage source Electricity enables its generate trigger pulse, returns down tube IGBT in an off state always, thyristor V2 of tested device and resonance Thyristor V1 in road is constantly in triggering state.
CN201410194146.4A 2014-05-09 2014-05-09 A kind of thyristor shunt detection circuit and detection method for voltage source converter Active CN103954893B (en)

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Publication number Priority date Publication date Assignee Title
CN105445621A (en) * 2015-12-22 2016-03-30 南京南瑞继保电气有限公司 Fault detection device of flexible direct-current line, charging method of fault detection device and detection method
CN106019173B (en) * 2016-05-25 2019-03-12 国网福建省电力有限公司 A kind of real-time fault detection method applied to voltage source converter
CN110726916B (en) * 2019-09-19 2020-11-20 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 Automatic testing device and method for breakover voltage of protection thyristor of MMC power module

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