POWER CONVERSION DEVICE

A power conversion device equipped with virtual synchronous generator control includes a converter to convert a first DC voltage output from a distributed power source into a second DC voltage, an inverter to convert the second DC voltage output from the converter into an AC voltage and output the AC voltage to an AC system, a converter control circuit, a virtual synchronous generator control circuit to impart a transient characteristic of a synchronous generator to the inverter, and an inverter control circuit to control the inverter as a voltage source, based on AC system voltage information input from the virtual synchronous generator control circuit. The virtual synchronous generator control circuit calculates a switching frequency at which charge/discharge of the distributed power source is switched, based on information necessary for virtual synchronous generator control including a power target value of the power conversion device. The converter control circuit uses the switching frequency to create a frequency range of AC system voltage for providing a dead zone in which charge/discharge power of the distributed power source is zero in a drooping characteristic of the power conversion device, or a hysteresis in switching of charge/discharge of the distributed power source. The converter control circuit performs control such that charge/discharge power of the distributed power source becomes zero in the frequency range.