Power Conversion System

Abstract: Provided is a power conversion system comprising a power conversion device and equipment. The power conversion device includes: an inverter that converts power into AC power and outputs the AC power; and a filter circuit in which a circuit component provided on the AC output side of the inverter and having a damping resistor and/or a filter reactor, and an AC capacitor that is disconnected from the circuit in the event of a fault, are connected in series. The equipment includes: a voltage recognition unit that recognizes the voltage value of a voltage generated by the circuit component; a voltage calculation unit that calculates a prescribed voltage calculation value on the basis of the voltage value of the voltages generated by the circuit component and recognized by the voltage recognition unit; a fault determination unit that compares the magnitude of the voltage calculation value calculated by the voltage calculation unit with a predetermined threshold value, and determines that there is a fault in the AC capacitor when the voltage calculation value is smaller than the predetermined threshold value; and an operation control unit that stops the power conversion device when the fault determination unit has determined that there is a fault in the AC capacitor while the power conversion device is running.

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