A comparative study of optimization techniques for voltage stability of power system

Present day power systems are being operated closer to their stability limits due to economic constraints. In today's scenario, as the development is taking place simultaneously the demand for the electricity in the world is also increasing. Operation and planning of large interconnected power systems are becoming more and more complex. In power system, voltage stability plays a very important role. Voltage instability may cause blackouts and collapse of the power system. Maintaining a stable and secure operation of a power system is therefore very important and challenging issue. Many traditional and advanced optimization techniques have been proposed for reactive power dispatch to improve voltage stability of the power system. In this paper, the importance of voltage stability and optimal reactive power dispatch are discussed and analysis of voltage stability is carried out using L-index method. The different optimization techniques for improving voltage stability are studied. This paper presents LP and PSO algorithm for system parameters development for enhancing voltage stability and voltage profile improvement. All algorithms are tested in IEEE 39 bus system. The performance of PSO is compared with conventional linear programming methods.