Abstract: 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 severit

Abstract: 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 severit

Abstract: An electrical grid control device includes a data acquisition unit that acquires measurement data including a voltage value and a current value of each unit in an electrical grid in which a power conversion device is connected, and a control method selection unit that selects a control method when active power and reactive power output to the electrical grid by the power conversion device are controlled based on the acquired measurement data.

Abstract: 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.

Abstract: Analysis of a natural energy power source linked to many locations requires an extremely large amount of computation time, so the calculation time is shortened by means of a reduction. However, the determination as to whether each natural energy power source can be reduced is not made in accordance with grid accident conditions, so the analytical precision of a grid reduction model is low.

Abstract: 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.