Static Volatge Stability Evaluation on the Urban Power System by Continuation Power Flow

Modern urban power systems have developed rapidly, and their characteristics such as high cable rate as well as the uneven distribution of loads and generators have an impact on the static voltage stability of the systems. Continuation power flow method, which is commonly used in voltage stability analysis, can construct the P-V curve and calculate the maximum loadability as well as the loading margin of the grid. Thus, this paper applies continuation power flow method to evaluate the static voltage stability of power systems with different characteristics. Also, the parameters of the test systems are obtained by modifying the IEEE 39-bus system referring to the characteristics of an actual grid in a coastal city of southern China. MATPOWER is used for analysis, and the simulation results are presented and discussed. Also, the influence of different characteristics on the voltage stability is summarized.