Voltage stability and economical optimization of reactive power in power systems with wind generators by harmony search method

In this paper, the voltage stability in power systems with economic dispatch (ED) problem is investigated. Also because of increasing the number of wind generators in power systems, they are considered in this investigation. For this purpose, with ED equations and equality and inequality conditions, a voltage stability index is considered. This index is considered as an inequality condition by optimization problem to guarantee the voltage stability in addition to economical optimization. Special conditions of wind generators are investigated too. Because of the complexity of this problem, harmony search method is used for solution of this optimization problem. Simulation results are presented to examine the performance of this method.