Hitachi, Ltd.

Noriyuki Uchiyama

Yasunori Ono

Masaya Ichinose

Sadamu Saito

Hiroyuki Fujita

Mitsugu Matsutake

Kenichi Kawamura

Shinichi Kondo

Yoshio Hamadate

Takashi Aihara

Shouichi Yamamoto

Hiroshi Kimura

Akihiko Kanouda

Kenichi Onda

Masatoshi Kumagai

Kenichiro Yamane

Kiyoshi Sakamoto

Yasushi Tomita

Kunihiko Tsunedomi

Tsutomu Hasegawa

Hiroto Sasaki

Tsukasa Onishi

Hideaki Horie

Takashi Matsunobu

Syuya Hagiwara

Masao Tsuyuzaki

Kenichi Azegami

Takuji Yanagibashi

A consumer apparatus operation management system that prepares an operation plan of a consumer control apparatus in a power distribution system includes: an evaluation unit configured to acquire system information including a system topology and impedances in the power distribution system, to predict load amounts and power generation amounts for respective prescribed nodes, to generate a voltage distribution profile indicative of a correlation between a power transmission distance and a voltage transition based on the system information, the load amounts, and the power generation amounts, and to figure out an evaluation value based on a variation width of the voltage distribution profile and a specified voltage width; and a preparation unit configured to prepare an operation plan related to heat quantity control and/or electric-energy control in the consumer control apparatus based on the evaluation value.

Consumer apparatus operation management system and method

To control a power state of a power system properly according to a communication state. A system for controlling a power system includes a plurality of sensor devices configured to output measurement data; a first control apparatus configured to estimate a first power state of the power system by using the measurement data obtained by the plurality of sensor devices, calculate a first controlled variable according to the estimated first power state, and output the calculated first controlled variable; and at least a second control apparatus configured to execute a predetermined control operation according to either the first controlled variable calculated in the first control apparatus, or a second controlled apparatus calculated in the second control apparatus. When it is not able to obtain part of the measurement data, the first control apparatus estimates the first power state by using predetermined measurement data among the obtained measurement data.

System and method for controlling power system

This invention is intended to provide a wind power generator system or method for controlling a wind power generator system, designed to implement switching-initiated smooth energy changeover without leading to a complex system configuration. The method of controlling a wind power generator system according to an aspect of the invention, wherein the generator system includes a wind turbine that uses wind to generate electric power and a control device that controls the wind turbine, is a control method designed so that when the wind turbine is generating power, the turbine drives the control device by use of the turbine-generated power, irrespective of an electric power system state.

Wind power generator system, and control method for the same

The disclosed windfarm control system comprising a windfarm and a central controller; the windfarm including plural wind power generators whose rotational speeds are variable, plural aerographs disposed in the vicinity of the wind power generators to measure the directions and powers of the wind at the sites of the generators, and plural local controllers disposed in the vicinity of the wind power generators to control the output of the wind power generators by controlling the rotational speeds of the generators; wherein the central controller calculats the control level which maintains the output of the windfarm constant for a predetermined time period and instructs the local controllers to control the rpm's of the wind power generators in accordance with the control level.

Controller and control techniques for windfarm

In a controller for a windfarm including a plurality of wind turbine generators controllable in rotation frequency and pith of blades of the wind turbine generators, coupled to a grid through a transmission line, an anemometer is provided to each wind turbine generator to transmits wind direction and wind speed data to a central controller which process the wind direction and wind speed data to transmit an output command each wind turbine generator. The central controller predicts, on the basis of the wind speed detected by the upstream wind turbine generator, variation in wind speed at other wind turbine generators to control the output of the windfarm. The output power may be limited or charging energy as rotation energy of blades and discharging the rotation energy as output power in addition to a battery unit for averaging.

Controller and control method for a wind farm including a plurality of wind turbine generators

Leakage fluxes from windings and leads of a stationary induction apparatus are confined within a tank. The stationary induction apparatus includes an electric functional units each including a winding and a core, a tank containing the electric functional units, high-voltage leads leading out from the windings, and low-voltage leads leading out from the windings. Magnetic shields are placed on the inner surface of a wall of the tank through which the high-voltage leads are drawn out of the tank, and a composite shield formed by combining nonmagnetic shields and magnetic shields is placed on the inner surface of a wall of the tank facing the low-voltage leads and is electrically short-circuited.

Stationary induction apparatus

A flat transformer has a coil body. The coil body is formed by winding plural insulated conductive wires. Each of the plural insulated conductive wires has a conductor having a circular shaped cross-section, and an outer peripheral portion of the conductor is coated by an insulating coating. A part of plural insulated conductive wires is used to form a primary winding and the remainder of the plural insulated conductive wires is used to form a secondary winding. A flat transformer may also have plural coil bodies. The plural coil bodies may be wound at plural stages. A part of the plural coil bodies is may be used to form a primary winding and the remainder of plural coil bodies may be used to form a secondary winding. The flat transformer can operate stably at a high frequency with a small loss.

Flat transformer and power supply unit having flat transformer

Growing community of inventors

Hitachinaka, Japan

Noriyuki Uchiyama