CONTROLLER AND CONTROL METHOD OF VOLTAGE TYPE POWER CONVERTER

PROBLEM TO BE SOLVED: To lower the peak value of a current flowing to each leg, the capacitor voltage variation, and power loss of a semiconductor element, with a simple configuration when compared with prior art.SOLUTION: Current of a power converter is controlled so that desired power conversion is performed between an AC system and a DC system by performing feedback control so that an AC current flowing to an AC terminal is subjected to coordinate conversion with the phase of a system voltage so as to have a first predetermined value, performing feedback control so that a circulation current flowing from a lower arm through an upper arm is subjected to coordinate conversion with a phase of second frequency different from the phase of a system voltage so as to have a second predetermined value for reducing voltage variation of a capacitor, and performing feedback control so that a circulation current is subjected to coordinate conversion with a phase of third frequency different from the phase of the system voltage so as to have a third predetermined value for reducing the current peak of an arm.