Fast Analysis Method of Static Voltage Security Based on Thevenin Equivalent

Abstract

With the large-scale renewable energy incorporation, the system operation fluctuation and randomness are increasing, and the real-time requirement of the static voltage security analysis of power system is more urgent. In order to meet the requirements of real-time, fast Thevenin equivalent parameter is used as the static voltage safety analysis index. The fast N-1 scanning of the static voltage security is achieved by studying the analytic relationship between line outage and Thevenin equivalent parameters, and then instable points of the voltage are found to ensure the system at safe operation level. The advantage of this method is that it can calculate the Thevenin equivalent parameter after disconnection, only using the voltage, phase angle, active power and reactive power of the system before line outage. The validity and correctness of this method are verified by simulation results.