Shimizu Corporation

The University of Tokyo

Shigeo Numata

Eisuke Shimoda

Toshihiro Yamane

Morihiro Kinoshita

Kimio Morino

Jumpei Baba

An electric power system includes: an uninterruptible power supply including an AC switch provided between a commercial power supply and an output part, a secondary battery, and an inverter provided between the AC switch and secondary battery; an important load connected to the output part; a distributed power supply connected to the output part; total load power consumption detection section detecting the power consumption of all loads including the important load; charge/discharge power detection section detecting charge/discharge power of the secondary battery; output power detection section detecting the output power of the distributed power supply; important load power consumption detection section detecting the power consumption of the important load; and a controller that inputs thereto detection values from the total load power consumption detection section, charge/discharge detection section, output power detection section, and important load power consumption detection section and outputs a control command value for controlling the secondary battery.

Electric power system

To provide an electric power system capable of adequately controlling the power flow in an AC switch () constituting an interruptible power supply, an electric power system according to the present invention includes: an uninterruptible power supply () including an AC switch () provided between a commercial power supply () and an output part (), a secondary battery (), and an inverter () provided between the AC switch () and secondary battery (); an important load () connected to the output part (); a photovoltaic power supply () connected to the output part (); an electric power detection section () that detects the power consumption of all loads including the important load (); an electric power detection section () that detects charge/discharge power of the secondary battery (); and a controller () that inputs thereto detection values from the electric power detection section () and electric power detection section () and outputs a control command value for controlling the secondary battery (), in which the controller () determines the upper and lower limit values of the control command value for operating the secondary battery () based on the detection values from the electric power detection section () and electric power detection section ().

Electric power system and uninterruptible power supply for important load

An islanded power system with a distributed power supply includes a system abnormality detection unit, which outputs an abnormality detection signal when an abnormality in a commercial system is detected; a breaker, which interrupts a supply of power from the commercial system when the abnormality detection signal is input from the system abnormality detection unit; a status detection unit, which outputs a breaker status signal when the breaker's open state is detected; and an electrical storage device, which compensates a fluctuation in load until a rotating machine generator switches to an islanded operation after the supply of power from the commercial system is interrupted by the breaker by starting the supply of power when the breaker status signal is input.

Islanded power system with distributed power supply

A control method of the present invention is a control method for distributed power sources which systematically controls a plurality of distributed power sources having different responsive capabilities for a load disturbance. The distributed power sources include an electricity storage device. The control method of the present invention includes: obtaining a component to be compensated for using a power source having a responsive capability equal to or lower than that of the electricity storage device based on a difference value between a remaining capacity of the electricity storage device and a target remaining capacity; and compensating for the component to be compensated for using the power source having a responsive capability equal to or lower than that of the electricity storage device.

Growing community of inventors

Tokyo, Japan

Shigeo Numata