A start-up and exit method of mmc valve steady-state operation test device

Abstract

The present invention relates to a start-up and exit method of an MMC valve steady-state operation test device, comprising a start-up process and an exit process; voltage, disconnect the charging circuit; B, the unlocking controller sends a trigger pulse to the auxiliary valve and the sample valve; C, start the energy consumed in the supplementary test of the supplementary energy supply; the exit process includes the following steps: I, cut off the supplementary energy Power supply; II, the trigger pulse of the locking auxiliary valve and the test valve; III, the ground rod short-circuit the capacitors of each sub-module in turn to complete the discharge. The invention realizes reasonable cooperation among various power sources, between the supplementary power source and the controller, ensures the smooth and safe progress of the test, and ensures the stable start and safe exit of the MMC valve steady-state operation test device.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a start-up and exit method of an MMC valve steady-state operation test device. Background technique [0002] Flexible direct current transmission (VSC-HVDC) technology has broad application prospects in the field of high-voltage direct current transmission. VSC-HVDC based on modular multilevel converter (MMC) is a way to realize direct current transmission using IGBT valves , and its core component is called MMC valve. [0003] The purpose of the steady-state operation test of the MMC valve is to investigate the tolerance of the valve assembly to key stresses such as current, voltage and temperature under long-term actual operating conditions, which is also an important part of the research on the reliability of the converter operation. The steady-state operation test device can generate voltage and current stresses equivalent to actual working conditions,...

AI Technical Summary

Problems solved by technology

The method of starting the supplementary power supply first and then putting in the charging power supply when starting up and the method of closing the valve before exiting the supplementary power supply when exiting will cause overvoltage in the capacitor of the grounding sub-module of the auxiliary valve

Due to the particularity of the structure of the MMC valve, the uniqueness of its charging sequence is determined, and the violent exchange of energy after the test starts will cause the loop current to oscillate and lead to overcurrent, which endangers the safety of the IGBT. Therefore, it is necessary to design a suitable soft start method when the device is started.

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