Matrix converter, wind power generation system, and method for controlling matrix converter

摘要

A matrix converter (3; 3A) according to embodiments includes a power conversion unit (10; 10A) and drive controllers (21 and 22; 21A and 22A). The power conversion unit (10; 10A) includes a plurality of bidirectional switches (Sw1 to Sw12) for connecting each phase of an alternating-current (AC) power supply (4) with each phase of a rotary electric machine (8). When the voltage of the AC power supply (4) is a predetermined value or less, the drive controllers (21 and 22; 21A and 22A) control the power conversion unit (10; 10A) to supply reactive power from the power conversion unit (10; 10A) to the AC power supply (4) and to control the torque of the rotary electric machine (8).