Converter valve routine testing circuit and testing method thereof

Abstract

The invention provides a converter valve routine testing circuit and a testing method thereof. The converter valve routine testing circuit comprises a power supply, a load reactor L, a first bridge arm and a second bridge arm. The first bridge arm consists of m MMC sub-modules which are connected in series. The second bridge arm consists of n MMC sub-modules which are connected in series. The load reactor L is connected between the first bridge arm and the second bridge arm. The output terminal of the power supply has m pairs of independent output ports which are respectively connected to each sub-module capacitor of the first bridge arm for charging the first bridge arm. The converter valve routine testing circuit solves a problem that the prior art adopts two MMC sub-modules to constitute a half-bridge back-to-back mode to perform an electrical performance test on the MMC valve and the half-bridge back-to-back mode test is low in efficiency and high in wastage of the IGBT device switch. The invention adopts a double-bridge-arm back-to-back main circuit topology containing multiple sub-modules. One test can perform routine tests on multiple MMC sub-modules, improves test efficiency and satisfies the batch testing requirements of the engineering.

Description

technical field [0001] The invention relates to the technical field of flexible DC power transmission in power systems, in particular to a routine test circuit and test method for a converter valve. Background technique [0002] The voltage source converter based HVDC (Voltage Source Converter based HVDC, VSC-HVDC) technology is a new type of DC transmission technology, which is called HVDC-Flexible in my country's academic and industrial circles. The existing engineering operation experience shows that this technology is very suitable for application in engineering fields such as new energy access to the grid, island power supply, urban center power supply, and weak AC grid interconnection. At present, the converters used in VSC-HVDC DC projects mainly adopt two-level, three-level and modular multi-level topologies. Compared with two-level, three-level and clamped multi-level topologies, Modular Multi-Level Converter (MMC) has low operating frequency of switching devices, ...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the embodiment of the present invention provides a converter valve routine test circuit and test method to solve the problem of performing electrical performance tests on MMC valves in the prior art using a half-bridge paired with two MMC sub-modules. , low test efficiency and high switching loss of IGBT devices

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