Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Toshiyuki Sawa

Toshiyuki Furukawa

Jun Yamazaki

Tsukasa Onishi

Taichiro Kawahara

Shigeki Mori

Masahiro Watanabe

Hiroaki Ogawa

Hideki Inoue

Tohru Watanabe

Yasuo Sato

Kenichiro Yamane

Masahiro Koike

Toshiyuki Miyake

Masahiro Yatsu

Keiko Abe

Masato Utsumi

Kazuo Takaku

Yasutaka Kimura

Ikuo Shigemori

Yu Ikemoto

Ichiro Shimoura

Hiroshi Iimura

Yoshihisa Okamoto

Hisaaki Takabayashi

Sigeru Kajiyama

Keisuke Fukuhara

Youko Sakikubo

Nobuhiro Gotouda

Provided is a data prediction system for predicting a future prediction value. The data prediction system has a data management device which manages data and a prediction operation device which models tendency of an error amount of a prediction operation result calculated on the basis of a correlation with a major explanatory variable and corrects a future prediction value. The data management device includes a storage unit which stores prediction target past measurement data observed with a time transition and explanatory factor data explaining the prediction target past measurement data. The prediction operation device includes a first prediction operation unit which performs prediction on the basis of a correlation between the prediction target past measurement data and the explanatory factor data, a second prediction operation unit which models tendency of an error of an operation result of the first prediction operation unit and performs future error amount prediction of the operation result of the first prediction operation unit, and a correction unit which corrects the operation result of the first prediction operation unit by an operation result of the second prediction operation unit.

Data prediction system and data prediction method

A power demand/supply adjustment power procurement plan support device supports a power system through a power transaction in the power market and has an added power transmission capacity analysis means and a target power transmittable capacity determination means. The added power transmission capacity analysis means obtains: actual power supply data including a power supply having supplied power to the power system and the actual value of a power supply amount; an actual power system stabilization data including a power supply performing power supply restriction for power system stabilization, an electric control amount or a customer facility performing a load restriction, and the actual value of a load control amount; and an actual power demand/supply adjustment power procurement data including a procurement amount of the power demand/supply adjustment power of a power supply participating in the power market and the actual value of the total procurement cost.

Power demand/supply adjustment power procurement plan support device and method, and power demand/supply adjustment power procurement plan support system

A plurality of forecast weather groups in a period comprising a plurality of days including a forecast target day for forecasting the electric power demand, and a plurality of actual weather groups in a period in a plurality of days in the past are set as the target period, and the similarity between the forecast weather group and the plurality of actual weather groups is calculated, a trend of a subsequent electric power demand is predicted based on the comparison of the plurality of calculated similarities whereby the electric power demand of a forecast target day is known.

Forecast system and method of electric power demand

A power system management device which manages a system state in a power system includes a system state candidate calculation unit for calculating state amounts of the system state based on an objective function from system characteristic information indicating characteristic information of a system structure, an inter-state distance calculation unit for calculating an inter-state distance representing a similarity of values between state amounts of the system state calculated by the system state candidate calculation unit, and a variability evaluation value calculation unit for calculating a variability evaluation value in which a variability of the system state is evaluated, based on an objective function value calculated from the state amount of the system state calculated by the system state candidate calculation unit and the inter-state distance calculated by the inter-state distance calculation unit. The system state is selected based on the calculated variability evaluation value.

Power system management device and method

This invention reduces degradation of respective lead storage batteries making up a lead storage battery bank and extends the longevity of the lead storage batteries. A lead storage battery system includes an individual battery state measurement unitthat measures current, voltage, temperature etc. of individual lead storage batteriesor lead storage battery modulesmaking up a lead storage battery bank, a state-of-charge model storage unitthat accumulates state-of-charge models representing a correlation between the battery states and a state of charge, a state-of-charge estimation unitthat estimates individual states of charge of the respective lead storage batteriesor lead storage battery modulesfrom the state-of-charge models and the battery states, a state-of-charge variation range determination unitthat calculates a state-of-charge maximum value and a state-of-charge minimum value, and an equalization-charging management unitthat controls performance of an equalization charge on the lead storage battery bank. The equalization-charging management unitperforms the equalization charge so that the state-of-charge maximum value falls within a range lower than an overcharge region and the state-of-charge minimum value falls within a range higher than a sulfation region.

Lead storage battery system

A battery control apparatus of this invention is provided which comprises: a battery installed on a feeder of a utility distribution system; batteries installed between pole-mounted transformers and branch points of the distribution lines; a communication network to transmit measurement data measured by meters; a battery control quantity calculation unit to determine battery control quantities from the measurement data acquired from the communication network; a load data collection unit to collect load data representing a combination of power consumption by a plurality of loads and generated power of distributed power generations; a frequency conversion unit to perform a frequency analysis on the load data; an intermediate-cycle component extraction unit to extract intermediate-cycle components; a battery control quantity calculation unit to determine battery control quantities from the extracted intermediate-cycle components; and a battery control command transmission unit to transmit the calculated control quantities to the batteries.

Method and apparatus for control battery and specification determining method of battery

One of a plurality of switches constituting a power system is set as a perceived switch, and n optional switches Bk (k&equals;1 to n) in the on state among the other switches are changed to the off state, and n loop networks including the perceived switch are created, and each switch Ck (k&equals;1 to n) constituting the loop networks is changed from the off state to the on state so as to create a plurality of network configuration candidates, and a power network configuration is decided on the basis of the plurality of network configuration candidates.

Creation method and apparatus of network configuration for power system

A distance measuring apparatus and method using an acoustic signal. It includes a transmitting probe for transmitting an acoustic signal from a transmitter, a plurality of receiving probes having resonance frequencies different from the central frequency of the signal transmitted from the transmitting probe, and a control circuit for controlling the functions of those probes. The acoustic signal is received by a receiving probe having a resonance frequency which provides the maximum received-signal sensitivity at the central frequency of the received acoustic signal under the control of the control circuit to thereby measure a long distance accurately.

Distance measuring apparatus and method

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Tokyo, Japan

Toshiyuki Sawa