Multi-objective optimal location of SSSC and STATCOM achieved by fuzzy optimization strategy and harmony search algorithm

Some applications of FACTS devices prove them to be proper and eective instruments for controlling the technical parameters of the power systems. Applying a suitable objective function to optimal placement of FACTS devices plays a very important role in economic improvement of a power market. In this paper, an eective method has been presented for optimal placement of FACTS devices in order to increase the voltage stability and to decrease the losses, considering the investment cost of the FACTS devices and the total fuel cost of the power system. Therefore, the Harmony Search Algorithm (HSA) is applied in this paper for simultaneous locating as well and for determining the sizes of both the series and parallel devices (SSSC, STATCOM) in a multi-objective structure. Since the optimization is multi-purpose, a fuzzy system is used in order to nd the best solution. The eectiveness of the proposed method is demonstrated using the modied 30-bus IEEE test system. Comparing the results achieved by the suggested algorithm with those of the PSO and GA, the proper eciency of the presented algorithm will be enforced.