Response-information Based Real-time Power System Voltage Stability and Angle Stability Emergency Control Scheme

This paper proposed a new comprehensive real-time emergency control scheme to address voltage and angle stability problems. The local voltage instability and decreased equivalent impedance may reduce the capability of system to consume transient impact energy, which may lead to angle instability. It appears that it is an angle instability problem, but actually it is voltage instability issue. So it is imperative to monitor the voltage and angle simultaneously. When it is detected that the system will lose stability, a corresponding emergency control measure is applied to enhance the stability of system. This method depends on system dynamic response curves rather than power system component models and operation conditions, thus it is suitable for complex operation conditions and different types of contingencies. The method has less computational complexity, more convenience and better flexibility. New England 10-generator 39-bus system was tested to verify the effectiveness of the proposed scheme in dealing with the voltage stability and angle stability problems. The simulation results show that it can correctly detect the instability of system and carry out the corresponding measure, so it can prevent the system from the widespread blackout and has a certain practical engineering value.