Hitachi, Ltd.

Hideyuki Kawamura

Masahiro Watanabe

Yasushi Tomita

Akira Kobayashi

Hirotaka Takahashi

Takafumi Ebara

Shoei Takahashi

Jumpei Ogawa

Yuichi Otake

Takeshi Ishida

Toshihiko Harashima

Energy demand in an entire community including multiple demanders is properly predicted and energy consumption thereof is properly controlled. Every day, some demanders are selected from the community and a request to adjust energy consumption for the following day is sent to the selected demanders. To decide a content of the request, energy demand for the following day is predicted. In this case, demanders which did not receive a request on past days are specified, and demand in the community for the following day is predicted based on the actual energy consumption by those demanders on the past days.

System, method and computer program for energy consumption management

An energy management system includes an equipment data management unit which manages charging/discharging loss of a battery and heat radiation loss of an electric water heater, and causes a control unit to perform control to give priority based on the comparison to the energy storage facility more reducing loss and store energy. The energy management system includes a system operation calculation unit which predicts voltage distribution of the next day of a distribution system or demand-and-supply balance amount of the entire system by state monitoring data of a power system, calculates a demand amount increasing target value necessary for avoiding a photovoltaic power generation amount suppression on a consumer end by the voltage distribution of the next day of the distribution system or the demand-and-supply balance amount, and controls the energy storage facilities so as to satisfy the demand amount increasing target value on the consumer end.

Energy management system, energy management apparatus, and energy management method

The invention suppresses the production of thermal stress in power generating equipment and the unstable behavior of the power generating equipment due to the variation of system frequency and stabilizes the system frequency. A power plant load control system controls the operation of a power plant equipped with a gas turbine comprising a combustor (,) and a turbine (,), and a power generator (,) disposed coaxially with the turbine. The power plant load control system comprises a governor load control unit (,) for determining a governor instruction (,) on the basis of the deviation of generated power (,) from a power generation instruction (,) given thereto by a central load dispatching station according to the variation of system frequency, and for determining a fuel supply rate instruction (,) corresponding to a speed droop ratio (R) according to the deviation of shaft speed (,) from a governor instruction (,). The governor load control unit (,) has a fuel supply rate instruction limiter (,) for limiting the change rate of the fuel supply rate instruction (,). The fuel supply rate instruction limiter (,) determines a limit to the change rate so that the production of thermal stress in the gas turbine and unstable combustion may be suppressed, and limits the variation of the fuel supply rate instruction (,) to a range below the limit.

Method of controlling load on power plant and load control system for carrying out the same

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Tokyo, Japan

Hideyuki Kawamura