Electric power conversion device and electric power conversion system

A power conversion device including a switching element unit for converting voltage of a DC power supply connected externally, to voltage corresponding to a voltage command, to supply AC power to a load, the power conversion device comprising:

• a filter reactor and a filter capacitor for
• smoothing output of the switching element unit;
• an output reactor provided between the load and the filter capacitor;
• a reactor current detection unit for detecting reactor current flowing through the filter reactor;
• an output voltage detection unit for detecting output voltage of the power conversion device;
• an output current detection unit for detecting current flowing through the output reactor, as output current;
• and
• a control unit for drive-controlling the switching element unit on the basis of detection outputs from the reactor current detection unit, the output voltage detection unit, and the output current detection unit, wherein
• the control unit includes a voltage command generation unit for generating the voltage command for controlling the output voltage of the power conversion device, a PWM signal generation unit for generating a PWM signal for driving the switching element unit, on the basis of the voltage command, and a PLL unit for changing a frequency of the output voltage in accordance with active power calculated on the basis of the output voltage and the output current, and
• the control unit further includes a voltage correction amount calculation unit for calculating a voltage command correction amount on the basis of the reactor current, and a voltage command correcting unit which corrects the voltage command in accordance with the voltage command correction amount and outputs the corrected voltage command to the PWM signal generation unit.