Mitsubishi Denki Kabushiki Kaisha

Shikoku Research Institute Incorporated

Sueo Sakata

Fumihiko Ishikawa

Hiromasa Higasa

Masayoshi Kumano

Shigenori Matsumura

In a power interconnection system between an electric power system and a power converter which makes AC power from a DC power source, a positive feed-back loop is constituted so as to include a frequency deviation detector, a band-pass filter, an inert zone circuit, an amplifier, an adder, a phase controller, an inverter controller, an inverter and an interconnection reactor. Thereby a sufficiently great frequency fluctuation is made after opening of a branch line switch, so as to produce a frequency abnormality signal to be given to a disconnection switch; and disconnection is made certainly.

Growing community of inventors

Amagasaki, Japan

Sueo Sakata