A COMPREHENSIVE STUDY ON VOLTAGE STABILITY MARGIN IMPROVEMENT IN POWER SYSTEM
Keywords:
FACTS devices, MLP, Shunt capacitor, STATCOM, SSSC, SVC, Tap-changing transformer, TCSC, Voltage stability.Abstract
In a power system, the excessive voltage drop in the buses due to increasing power demand leads to voltage instability consequent voltage collapse. Hence the voltage stability is a critical concern in a power system. In this paper, the application of tap-changing transformer, shunt capacitor, Static Var Compensator (SVC), Static Synchronous Compensator (STATCOM), Thyristor-Controlled Series Capacitor (TCSC), and Static Synchronous Series Compensator (SSSC) for improving voltage stability margin is studied. The Continuation Power Flow (CPF) method has been applied to the IEEE 14-bus test system to determine the Maximum Loading Point (MLP) and demonstrate the effectiveness of these devices on improving voltage stability margin. Simulation results show that these devices can increase the load ability margin of power systems and, as a result, causes voltage stability improvement. Although the performance of shunt compensation devices includes SVC, STATCOM, and shunt capacitor are better than other devices.
