Hitachi, Ltd.

Taichiro Kawahara

Yasuo Sato

Masahiro Yatsu

Eisuke Kuroda

Nao Saito

Toshiyuki Sawa

Kenichiro Yamane

Jun Yamazaki

Masahiro Watanabe

Toshiyuki Miyake

Shota Omi

Masato Saito

Kenta Kirihara

Kouichi Hara

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 system operation decision-making assistance device includes: a state mode clustering unit that calculates, on the basis of measurement data DBof a power system and a clustering parameter DB, which state mode, from among prescribed state modes, applies to a power system; a state mode collation unit that collates state transition data DBindicating transitions between state modes and the calculated state mode to calculate state transition probability data, which is the probability of transitioning from the calculated state mode to each state mode defined in the state transition data; and an accident shift pattern calculation unit that calculates important accident cases on the basis of a system model DB, an importance parameter DBincluding the importance of a power system accident, the measurement data, and the calculated state transition probability data.

System operation decision-making assistance device and method

The setting range of the voltage and the reactive power of a power system is maintained during variations of voltage and power flow due to the output variation of renewable energy of a large number of power supplies which fluctuate due to weather. A voltage/reactive power operation assisting device is provided with a first database for storing the data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting the voltage/reactive power of a power system. A second database stores the device operation data of the individual control device; and the operation of the individual control device is predicted from the data stored in the first database to obtain individual control device operation prediction data. A display unit displays the individual control device operation prediction data and the device operation data in a contrastive manner.

Voltage/reactive power operation assisting device and assisting method, and voltage/reactive power operation monitoring control device and monitoring control method

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

A command system of a power conditioning system of the present invention receives return pattern information including a time instance and an upper output limit, and issues a command with respect to the upper output limit of the power conditioning system, the return pattern information being for preventing the frequency of an isolated power system, which is calculated by a planning server, from causing a sharp change.

Power conversion device, control device for power conversion device, and control method for power conversion device

In a power equipment control system connected, via a communication network, to a system operation server of a power system and a single or a plurality of power equipments for performing power consumption or storage with interconnecting to the power system, to regulate power demand and supply balance of the power equipment, a contribution degree is obtained by preparing a demand plan of subsequent power of said power equipment; transmitting, to said power equipment, information relevant to demand regulation request to said power equipment, received from said system operation server, based on said demand plan; receiving demand regulation result of observation information on the demand regulation performed within said power equipment, based on said demand regulation request; and performing said demand regulation by said power equipment from said demand regulation result.

Growing community of inventors

Tokyo, Japan

Taichiro Kawahara