Abstract: Increasing power transmission pressures are brought on Songbai power grid of Jilin province by concentrated accession of wind power and thermal power. And serious stability problems will be caused by the 500 kV multiple-circuit transmission lines at concurrent fault. An intelligent security and stability control system was built for Songbai power grid in order to solve those problems, which consists of stability control devices in eight stations (power plants). The system is designed by using layering and zoning strategy and can automatically identify the power grid information and fault types and rapidly cut off the wind power plants and thermal power plants in turn to protect the stability of power system according to the preset strategy. The configuration, control strategy, design and simulation analysis of the regional security and stability control system for Songbai power grid are presented in this paper. Results show that the security and stability control system can guarantee security and stable operation of power grid and improve the power supply ability of Songbai power grid.

Key words: wind power, intelligent security and stability control system, transient stability