US 11,942,787 B2
Power conversion device
Sadayuki Inoue, Tokyo (JP); Tomihiro Takano, Tokyo (JP); and Keishi Matsuda, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/619,249
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 23, 2019, PCT No. PCT/JP2019/028880
§ 371(c)(1), (2) Date Dec. 15, 2021,
PCT Pub. No. WO2021/014577, PCT Pub. Date Jan. 28, 2021.
Prior Publication US 2022/0285943 A1, Sep. 8, 2022
Int. Cl. H02J 3/16 (2006.01); H02J 3/32 (2006.01); H02J 3/38 (2006.01)
CPC H02J 3/16 (2013.01) [H02J 3/32 (2013.01); H02J 3/381 (2013.01); H02J 2300/22 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A power conversion device disposed between a distributed power supply and an AC distribution system, the power conversion device comprising:
an inverter to convert power output from the distributed power supply into AC power;
an effective voltage calculator to calculate an effective voltage of an AC voltage in the AC distribution system; and
a controller to control active power and reactive power output from the inverter based on the effective voltage, wherein
when a change in the effective voltage is caused by an operation of a system stabilization facility provided in the AC distribution system, the controller controls an operation of the inverter to suppress a change in the reactive power caused by the change in the effective voltage, wherein
the controller includes a system voltage monitor to monitor the effective voltage in the AC distribution system, and
when an amount of change in the effective voltage monitored by the system voltage monitor exceeds a threshold value, the controller determines that the change in the effective voltage is caused by the operation of the system stabilization facility.