Power conversion device and power conversion system

A power conversion system comprising:

• a controller for a distributed power supply, a virtual synchronous generator control function of simulating a characteristic of a synchronous generator being implemented in the controller;
• and
• a power conversion device to operate based on a command from the controller,
• the power conversion device including
• an inverter connected between an AC grid and the distributed power supply to operate as a voltage source for the AC grid based on the command,
• a voltage measurement unit to measure a voltage value of a grid AC voltage output from the inverter to the AC grid,
• a target AC voltage generation unit to generate a target AC voltage in a shape of a sinusoidal wave as an output target value of the inverter that operates as the voltage source, and
• a voltage control unit to control an operation of the inverter to compensate for a deviation between the voltage value measured by the voltage measurement unit and the target AC voltage, wherein
• the command from the controller includes a frequency command value of the grid AC voltage, and
• the target AC voltage generation unit calculates the target AC voltage using an amplitude command value of the grid AC voltage, the frequency command value output from the controller, and phase information of the grid AC voltage generated in the power conversion device.