Dynamic simulation of long-term voltage collapse and analysis of influencing factors

Abstract

Abstract - Voltage collapse in the power system is a dynamic and complicated process which is influenced by several factors, especially the behaviors of voltage control equipment, protection systems and load response. Therefore, full understandings of such a complicated problem are essential to ensure safe and secure operations of a power system. In this paper, the influencing factors on the long term dynamics of the power system voltage are analyzed. The dynamic models of the On Load Tap Changer (OLTC) and Over Excitation Limiter (OEL) are considered. The simulation results prove that these devices play a very important role in the voltage dynamics of the power systems.