Voltage Stability Enhancement using FACTS Controllers Dependent on Voltage Stability Indices

Increased load demand (mostly reactive load) and insufficient generation sources have caused the power system to work near its point of voltage uncertainty. For many researchers, the question of evaluating voltage stability prior to voltage failure has become an exciting topic. Therefore, several voltage stability indices have been suggested to measure the distance of the power device from voltage failure. In this article, two-line indices of voltage stability have been carried out. The index of line stability (𝑳𝒎𝒏) and the index of rapid voltage stability are (FVSI). They were used to govern the weakest bus in the IEEE 30-bus test process. Then, three kinds of FACTS compensation, shunt, series and hybrid (shunt and series) were used to assist voltage stabilization. The results indicate that shunt compensation is more effective than the other two forms.