Tmeic Corporation

Masakazu Okayasu

Masahiro Kinoshita

Issei Fukasawa

Haiqing Li

A PI controller that calculates a PI control value for charge limitation, which is a PI control value for a deviation between a DC voltage applied to an inverter circuit and a charge limiter operating voltage when the DC voltage is higher than the charge limiter operating voltage, and calculates a PI control value for discharge limitation, which is a PI control value for a deviation between the DC voltage and a discharge limiter operating voltage when the DC voltage is lower than the discharge limiter operating voltage. A limiter regulator increases a limitation on a charging power command value from a host device by a command value limiter in accordance with the PI control value for charge limitation and increases a limitation on a discharging power command value from the host device by the command value limiter in accordance with the PI control value for discharge limitation.

Power conditioner and power conversion system

An electric power conversion apparatus includes: an electric power conversion circuit that allows a DC terminal to be connected to a DC power source via a DC bus line, and performs at least one of converting DC power of the DC power source into AC power to output, or converting AC power into DC power to output; a DC switch turned on when the electric power conversion circuit performs electric power conversion; an AC switch provided on a side of the AC terminal, and turned on when the electric power conversion circuit performs the electric power conversion; a DC voltmeter that measures a potential at a predetermined portion, on a side of the DC terminal; a ground connection portion that connects the DC bus line and ground potential; and a control circuit connected to the electric power conversion circuit, the DC switch, the AC switch, and the DC voltmeter.

Growing community of inventors

Tokyo, Japan

Masakazu Okayasu