Multilevel Power Conversion System And Control Device For Multilevel Power Conversion System

Abstract: The present invention provides a means for suppressing overvoltage breakdown of semiconductor elements in a power converter due to lightning surges in a multilevel power conversion system. This multilevel power conversion system comprises a multilevel power converter (30) and a control device (40) including: an operation control unit (51) that, on the basis of a predetermined condition, transitions the operation mode of the multilevel power converter (30) to a standby mode in which power conversion is not performed between a DC input/output unit (31) and an AC input/output unit (32); and a gate signal generation unit (53) that, in the standby mode, generates and outputs a gate signal to put one and/or both of a third semiconductor switching element (3) and a second semiconductor switching element (2) into a state of continuity or a switching state.

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