Analysis for Effects of Load Characteristics on Power System Voltage Stability

Load characteristics will be changing from time to time and may affect the system voltage stability to some extent. In order to investigate the effects of load characteristics on the system voltage stability, the static ZIP load model is used to describe the load characteristics and the method of P-V curve is adopted to analyze the system voltage stability under both normal operation and contingencies to find the maximum margin of real power transfer. System studies include the analysis of effects from different load models with three types of compositions and those with three kinds of single composition on the system voltage stability of a large power system under normal operation and contingencies. The results will be of use to the practices of system planning and operation.