Hitachi, Ltd.

Chihiro Fukui

Yasushi Harada

Hideaki Suzuki

Yasuo Sato

Dai Watanabe

Hiroyuki Kudo

Masahiko Amano

Tomoharu Nakamura

Masayuki Tani

Takaharu Ishida

Yasunori Katayama

Junzo Kawakami

Shinichi Shimode

Yutaka Kokai

Shigeru Tamura

Masahiro Sekoguchi

Tadayoshi Saitou

Tetsuo Yamada

Supervisory control equipment for smart grids provided with a plurality of generators and loads and operated in interconnection with a commercial power system through an interconnected circuit breaker, comprising a frequency control ability calculation part for calculating the frequency control ability of the interconnected system by using a total power demand and a bus bar frequency; and an islanding and interconnection detection part for calculating frequency control ability of the commercial power system according to the frequency control ability of the system of the frequency control ability calculation part to discriminate between the interconnected and islanding operations according to the magnitude of the frequency control ability.

Supervisory control method and equipment for smart grids

With regard to electric-power-supply control, there is provided an electric power supply control system for implementing load control used to be executed for each individual customer consuming electric power as coordinated control for all customers and for selecting an optimum electric-power supplier in case there are a plurality of electric-power suppliers supplying electric power to the customers. Disclosed is the electric power supply control system for purchasing electric power from a plurality of electric-power suppliers and distributing purchased electric power to any arbitrary number of customers, the system comprising: an electric-power-purchase determining apparatus for selecting some of the electric-power suppliers and determining amounts of electric power to be purchased from the selected electric-power suppliers in accordance with a predetermined rule; an electric-power storage apparatus for storing electric power; and a demand control apparatus for transmitting electric power obtained by synthesizing electric power determined by the electric-power-purchase determining apparatus with electric power generated or absorbed by the electric-power storage apparatus to the customers.

Electric power supply control system

A portal site for serving data monitored and observed, which can not only act for monitoring and observing services, instead of a facility owner, but also process the data into economically valuable data with the use of the result of monitoring and observation, is connected to a computer network so as to gather sequential data which is observed in time series by a not less than one sensor as to an operation running condition of a facility belonging the facility owner, and event data monitored invariantly, and incorporates a function of obtaining a data disclosure profile for designating a degree of disclosure of the data, from the facility owner, and a function of onerously serving an item of secondary data obtained by processing the data in a range satisfying the data disclosure profile, to a data user different from the facility owner.

Portal site for serving data monitored and observed and method of using data monitored and observed

To permit a customer to reduce environmental load without reducing their electric power, a green power supply system is provided which includes a power supply request acceptance part which accepts from a customer a request to supply power having small environmental loads to the customer, a storage-of-power-supply-content requesting part which stores the state of power supply from each power generation facility, a green degree calculating part which determines the proportion of power which is supplied from the power generation facility having the small environmental loads, in power supplied to the customer, and a customer-directed green-degree notification part which notifies the customer of the degree of environmental load.

Green power supply system and green power supply method

A maintenance service system for home electric appliances is disclosed which comprises a home electric appliance, a portable terminal which can communicate with the home electric appliance and an information providing server which can communicate with the portable terminal.

Maintenance service system for home electric appliances

A method of, and an apparatus for, estimating frequency characteristics of a power system in accordance with the operation conditions of the power system. In the estimation of frequency characteristics, a sensitivity coefficient of power control of each generator with respect to a frequency deviation is defined as a frequency characteristic coefficient of the generator and this frequency characteristic coefficient of the generator is weighted in accordance with its rated output so as to determine a frequency characteristic coefficient of a generator group comprising a plurality of generators belonging to the power system. A frequency characteristic coefficient of a load determined separately is added to the frequency characteristic coefficient of the generator group, and estimated frequency characteristics for the supply-and-demand imbalance quantity of the power system are provided.

Method and apparatus for estimating frequency characteristics of power system, and application thereof

In a control system equipped with a plurality of subsystems and a supervising subsystem for supervising these subsystems, a subgoal achievement performance is calculated by the subsystem using its own knowledge and its own condition with respect to a subgoal defined by the supervising subsystem, and the supervising subsystem controls a control system by utilizing the knowledge and conditions of the respective subsystems by applying a subgoal execution instruction to the subsystem based upon the calculation result. Since not only the knowledge but also the condition of the subsystems, proper controls can be realized in not only such a case that the supervising goal is directed to a static temporal aspect, but also such a case that the supervising goal contains a temporal element.

Distributed control system

An expert system in which a plurality of knowledge descriptive layers are provided in a frame system. Each descriptive layer is composed of several frames. The frames of the lower knowledge descriptive layer correspond to the elements of a knowledge processing object system. The content of frames of the upper knowledge descriptive layers is determined as an inference made with reference to the frames of the lower layer. This determination is initiated and executed when the content of slots of the frames is updated.

Expert system development support system and expert system environment

An expert system in which a plurality of knowledge descriptive layers are provided in a flame system. Each descriptive layer is composed of several flames. The flames of the lower knowledge descriptive layer correspond to the elements of a knowledge processing object system. The content of frames of the upper knowledge descriptive layers is determined as an inference made with reference to the frames of the lower layer. This determination is initiated and executed when the content of slots of the flames is updated.

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Hitachinaka, Japan

Chihiro Fukui