Hitachi, Ltd.

Masataka Imabayashi

Masahiro Watanabe

Yoshikazu Ishii

Yuki Tsujii

Ryousuke Nakamura

Satoshi Shimakura

Masachika Nakatani

A power system stability monitoring device comprising: a simple stability calculation unit that calculates the angular velocity and internal phase angle of a generator in each fault case based on fault conditions and the system configuration of the power system; a severity indicator calculation unit that calculates a severity indicator that represents the degree of system instability based on the angular velocity and internal phase angle; a PCS power supply severe parallel-off condition extracting unit that calculates a PCS power supply parallel-off severity indicator based on a parallel-off sensitivity indicator representing a degree of influence of PCS power supply parallel-off on the degree of instability and the severity indicator, and that extracts fault cases where the parallel-off severity indicator exceeds a prescribed threshold; and a detailed stability calculation unit that performs a detailed stability calculation for each extracted fault case based on the severity indicator or parallel-off severity indicator.

Stability monitoring device and method

An electric power transmission facility planning support system for materializing facility planning including the facility expansion of an electric power transmission network is provided based on the system information of a power system. This support system includes an output control quantity calculation device for deriving the output control quantities of natural variation power supplies in consideration of the operation limit value of the network; and a facility expansion planning device for making the facility planning based on one of the type, location, and capacity of an electric power transmission facility considering the output control quantities.

Electric power transmission facility planning support system and the method thereof

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Tokyo, Japan

Masataka Imabayashi