Bridge arm bypass protection circuit of modularization multi-level converter aiming at direct current short circuit fault
A modular multi-level, DC short-circuit technology, applied in the direction of emergency protection circuit devices, emergency protection circuit devices, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problem of increasing the time required for fault recovery, prolonging the The time of DC side current attenuation, the influence of AC system stability, etc., to avoid shutdown operation, reduce fault current, and shorten fault recovery time
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[0015] The invention provides a bridge arm bypass protection circuit for DC short-circuit faults of a modular multilevel converter. In the case of a DC unipolar ground fault or a bipolar short-circuit fault in a flexible HVDC power transmission system with a pole structure, the present invention will be further described below in conjunction with the accompanying drawings.
[0016] Such as figure 1 As shown, it is suitable for a) the schematic diagram of DC bipolar short-circuit fault in pseudo-bipolar system, and b) the schematic diagram of DC unipolar ground fault and bipolar short-circuit fault in true bipolar system; the pseudo-bipolar structure system with AC circuit breaker is used as For example, the specific structure is as figure 2 As shown, the converter in the figure is composed of multiple sub-modules 1 connected in series to form a bridge arm 2, and the upper and lower bridge arms 2 are each connected in series with a bridge arm inductor 3 to form a phase unit o...
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