A Comparative Study of Different Methods for Power System Stability Improvement

 The voltage stability control problem has become an important concern for utilities transmitting power over long distances. This paper presents a comparative study of different approaches for reactive power control with the purpose of improving the voltage stability and angular stability of a power system. The following methods are compared with respect to cost, voltage stability and angular stability and losses, namely Economic Load dispatch, Real power scheduling based on Relative Proportion of Generations (RPG), evaluated by F_LG matrix and without Real Power scheduling. In both the methods optimal locations and sizes of SVC devices are also provided based on voltage stability criterion using L-Index. The approaches are tested on IEEE 14 bus and IEEE 30 bus system on peak load conditions under normal and contingency conditions.