Fast Voltage Stability Assessment for Large-Scale Power Systems

Y. Liu, L. Wang, and Z. Yu (PRC)


Voltage stability assessment, power transmission path, reactive power reserve


Based on power transmission paths, a new method for on line voltage stability assessment is proposed in this paper. In the large-scale power systems, the local voltage stability index is used to determine weak buses. Based on the electrical distance, participant buses and key power sources of the reactive and active power transmission paths are decided. The weak power transmission paths are searched and the weakest one is computed through the equivalent systems. The voltage stability index incorporating the reactive power reserve of key generators is used as a director for voltage stability assessment. Simulation results of the practical Shandong power system in China demonstrate that the accuracy and the speed can meet the need of on-line application.

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