High-frequency switching type conversion device

A high-frequency switching type conversion device that converts DC power provided from a DC power supply, to AC power and supplies the AC power to a load, the conversion device comprising:

• a filter circuit connected to the load and including an AC reactor and a first capacitor;
• a DC/AC inverter connected to the load via the filter circuit;
• a DC/DC converter provided between the DC power supply and the DC/AC inverter;
• a second capacitor provided between the DC/AC inverter and the DC/DC converter;
• and
• a control unit configured to control the DC/DC converter and the DC/AC inverter to alternately have a stop period of high-frequency switching, the control unit being configured to set a current target value for the DC/DC converter to thereby be synchronized with current of the AC power, based on voltage of the AC power, voltage variation due to current flowing through the AC reactor and an impedance of the AC reactor, reactive currents respectively flowing through the first capacitor and the second capacitor, and voltage of the DC power,
• wherein, in a case where an output current target value for the load is Ia*, an electrostatic capacitance of the first capacitor is Ca, a voltage value of the AC power is Va, voltage on the DC power supply side is VDC, and a Laplace operator is s, the control unit sets an AC output current target value Iinv* for the DC/AC inverter at a circuit connection point between the filter circuit and the DC/AC inverter.