A power conversion device and a control method of the power conversion device are provided. The power conversion device according to an embodiment includes an inverter (3) and a converter (5), each ofwhich has DC-side terminals and AC-side terminals. The DC-side terminals are connected respectively to a common DC link section (4a, 4b). The AC-side terminals are respectively connected to a commonpower system. The power conversion device also comprises a control device that controls the reactive power output by the power system so that the reactive power output by the power system is output asthe sum of reactive power output from the inverter (3) via a generator (1) and reactive power output from the converter (5).