Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Keiichi Sato

Hiroshi Nagasato

Hiroaki Kaku

Nin Kake

Akihito Ootani

Toru Kushisaka

Shinji Miyauchi

Motomichi Katou

Manabu Takahashi

A distributed power supply system is configured to execute a process for determining whether or not to permit a diagnostic process in such a manner that it is determined whether or not a difference between a set upper limit value and an actual measurement current value is not less than a load current value, the set upper limit value being a predetermined upper limit value set with respect to a detected current of a current sensor, the measurement current value being detected by the current sensor in a state where the diagnostic process is not executed, and the load current value being a value of a current flowing from a commercial power utility to a power load during execution of the diagnostic process; and if it is determined that the difference is not less than the load current value, the controller permits the diagnostic process.

Distributed power supply system and control method thereof

A distributed power supply system of the present invention comprises a distributed power supply apparatus () for supplying electric power to a customer load () interactively with a commercial electric power utility (); an internal load () supplied with electric power from the commercial electric power utility; a current sensor () for detecting a magnitude of a current and a direction of the current, the current being in a location closer to the commercial electric power utility than the internal load and the customer load; and a controller (); wherein in a state where the distributed power supply apparatus) is not generating the electric power, the controller causes the internal load () to actuate, performs determination control as to an installation state of the current sensor () plural times based on a value detected by the current sensor, and performs the determination control in such a manner that at least one of plural intervals at which the determination control is performed is set to an interval other than an integral multiple of another interval of the plural intervals.

Distributed power supply system

A power converter of the present invention is configured to convert DC power generated by a power generator () into AC power. The power converter includes: a boost converter circuit () configured to boost an output voltage of the power generator (); an inverter circuit () configured to convert an output voltage of the boost converter circuit () into AC power and to interconnect the AC power with a power system (); a buck converter circuit () configured to perform power conversion of output power of the boost converter circuit () and to supply resultant power to an internal load (); and a controller (). The controller () is configured to control the output voltage of the boost converter circuit () to be lower than or equal to a second voltage value which is less than the maximum value of AC voltage of the power system (), in a case of supplying output power of the power generator () to the internal load () via the boost converter circuit () and the buck converter circuit ().

Power converter and fuel cell system including the same

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Kyoto, Japan

Keiichi Sato