Power conversion system and power conversion device

A power conversion system, comprising:

• an automatic voltage regulator installed in a power distribution grid;
• and
• at least one decentralized power supply system,
• the decentralized power supply system, including:
• a decentralized power supply;
• and
• a power conversion device,
• the power conversion device including:
• a power converter circuit to convert a direct-current power output from the decentralized power supply into an alternating-current power, and output the alternating-current power to the power distribution grid;
• a voltage detection unit to detect a voltage at a point of interconnection between the power converter circuit and the power distribution grid;
• a voltage target value generation unit to remove a high-frequency variation from a root mean square of the voltage detected by the voltage detection unit to generate a voltage target value;
• a correction unit to correct the voltage target value when the automatic voltage regulator has performed an action;
• and
• a command unit to command, when the voltage at the point of interconnection detected by the voltage detection unit deviates from a voltage control deadband referenced to the voltage target value, the power converter circuit to output a reactive power based on a magnitude of the deviated amount of voltage.