POWER CONVERTING APPARATUS FOR SUPPLYING DC POWER FOR DC DISTRIBUTING LINE

摘要

The present invention relates to a direct current power supply power conversion apparatus for a direct current distribution line. A 3-level neutral point clamping type power conversion apparatus comprises: a protective circuit unit which is provided on a converter output side of the power conversion apparatus, wherein the protective circuit unit continuously supplies, when a fault occurs on the direct current distribution line, power to the direct current distribution line while restricting the current output of the power conversion apparatus within the rating of an inner switching element in accordance with control of an internal control unit of the power conversion apparatus, and returns, when the fault of the line is removed, to the state before the fault occurs, and outputs a normal current.