Static Voltage Stability Enhancement Through Selection Optimal Location of SVC

Abstract

The increase in power system demand has forced the power system to operate closer to its stability limit, voltage instability in the electrical networks has been given much attention by power system researchers and planners in recent years, being regarded as one of the major sources of power system insecurity. Maintaining a stable and secure operation of power system is therefore very important and challenging issue. One of the major causes of voltage instability is decrease in reactive power which occurs in stressed condition of the power system. There are several techniques and tools for voltage stability analysis in power system, in this dissertation two methods of analysis are used, V-Q sensitivity and modal analysis. Flexible Alternating Current Transmission System (FACTS) devices play an important role in improving the performance of power system, but these devices are very costly and hence need to be placed optimally in power system. This dissertation evaluates the performance of Sudan National Grid against the growing demand and reactive power resources and enhancement of voltage stability of Sudan national Grid by using static VAR compensator (SVC). The optimal Location of SVC is chosen by using three techniques, Active power index (VPI-bus), Reactive power index (VQI-bus) and line index (L-index). These techniques are described and applied to the Sudan National Electric Grid (SNEG). The simulation is carried out by using NEPLAN Software. The results obtained showed the effect of SVC on the voltage and power losses.