Hybrid Big Bang–big Crunch Optimization Based Optimal Reactive Power Dispatch for Voltage Stability Enhancement

One of the most crucial functions in the operation and control of power system is reactive power dispatch (RPD).A hybrid Big Bang–Big Crunch (HBB–BC) optimization algorithm which consists of A Big Bang– Big Crunch algorithm combined with particle swarm optimization (PSO) is proposed in this paper in order to solve optimal reactive power dispatch (ORPD) problem. The L-index of load buses is base for the monitoring methodology for voltage stability. Minimizing the real power loss is the objective. This algorithm is used to find the settings of control variables such as generator voltages, tap positions of tap changing transformers and switchable VAR sources. Furthermore, the optimization models are implemented and solved using the GAMS programming language .The proposed method has been carried out on IEEE 30 -bus test system. For comparative study the results obtained by the proposed algorithm are compared with those obtained by modeling the optimization problem in the GAMS environment. The outcomes indicate that the real power loss is decreased with voltage stability margins increased simultaneously.