POWER CONVERSION DEVICE

This power conversion device is provided with: a power conversion circuit that is connected to a DC power source and a power system and that converts DC power and AC power; a phase synchronization circuit for outputting a phase command value on the basis of the system AC voltage phase of the power system; and a control circuit that controls the power conversion circuit on the basis of the phase command value from the phase synchronization circuit. The phase synchronization circuit includes: a phase difference calculation unit that calculates a phase difference indicating a deviation of a phase command value with respect to a system AC voltage phase of the power system at a preset cycle; a phase difference correction unit; and a phase command value generation unit that outputs the phase command value on the basis of the output of the phase difference correction unit. 电力转换装置具备：电力转换电路，与直流电源及电力系统连接，进行直流电力与交流电力之间的转换；相位同步电路，基于上述电力系统的系统交流电压相位，输出相位指令值；以及控制电路，基于来自上述相位同步电路的上述相位指令值，控制上述电力转换电路。上述相位同步电路具备：相位差计算部，以预先设定的周期计