Combined power generation system with power conversion device

摘要

In a combined power generation system such as a microgrid, a power conversion device is provided that does not require a change in control method when switching from independent operation to interconnection operation. A first internal phase difference angle calculation unit (60) for calculating a first internal phase difference angle by integrating a deviation between the first frequency command value and the frequency acquired by the frequency acquirer (14); and a first reactive power command value And the reactive power obtained based on the value measured by the first measuring device (3, 4) is proportionally calculated, and a reference voltage is added thereto to calculate a first internal electromotive force command value. From the internal electromotive force command value calculation unit (50), the first internal phase difference angle, the first internal electromotive voltage command value, and the voltage measured by the voltage measuring device (4), the first power converter (6) A first current command value calculation unit (70) for calculating a command value of the output current of the first current converter, and controls the first power converter (6) based on the output of the first current command value calculation unit (70).