A test circuit and method for testing the on-off characteristics of a converter valve

Abstract

The invention discloses a test circuit and a method for testing the on-off characteristics of a converter valve. In the test circuit, the positive pole of the DC power supply in the energy supplement circuit is connected to the anode of the first thyristor; one end of the recovery valve in the recovery circuit is respectively connected to the One end of the inductor is connected to the cathode of the first thyristor, and the other end of the recovery valve is connected to the negative pole of the DC power supply; one end of the H bridge circuit in the output circuit is connected to the other end of the inductor, and the other end of the H bridge circuit is connected to the negative pole of the DC power supply. The circuit includes: a first sub-module including a first capacitor and a first switch component and a second sub-module including a second capacitor and a second switch component, the capacitance of the first capacitor and the second capacitor are different; the load circuit includes a The valve test object, the valve test object to be tested is connected to the two ends of the H-bridge circuit. Through the implementation of the invention, a test platform capable of periodic operation and whose turn-on voltage is different from the turn-off voltage can be built, so that the turn-on and turn-off characteristics of valves and the electrical performance of internal components can be tested in a targeted manner.

Description

technical field [0001] The invention relates to the field of operation tests of ultra-high voltage converter valves, in particular to a test circuit and method for testing the on-off characteristics of converter valves. Background technique [0002] The core device of modern high-power power electronic devices is the single and bi-directional UHV converter valve. The UHV converter valve uses the switching characteristics of the internal thyristor to complete its function as a "high voltage switch", becoming the most widely used power electronic device. device. The technical indicators and technical level of the UHV converter valve determine the technical indicators and level of the DC project to a large extent, so it is necessary to conduct electrical performance tests on the UHV converter valve. [0003] In order to verify the operating performance of the UHV converter valve, it is necessary to simulate the voltage waveform in the actual engineering, and to test the openin...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the fact that the test device in the prior art cannot simulate the voltage of the UHV converter valve when it is turned on or off, and thus cannot control the on-off of the valve test product under engineering operating conditions. characteristics and the defects of poor test equivalence, thus providing a test circuit and method for testing the on-off characteristics of the converter valve

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