Optimal placement of multi-type FACTS devices by hybrid TS/SA approach

In this paper, a hybrid tabu search and simulated annealing (TS/SA) approach is proposed to find the optimal placement of multi-type FACTS devices to minimize the total generator fuel cost of all loading levels. The problem is decomposed into an optimal placement of multi-type FACTS devices subproblem that is searched by the hybrid TS/SA approach and an OPF with multitype FACTS devices subproblem that is also solved by the hybrid TS/SA approach and quadratic programming (QP). Four types of FACTS devices are used: thyristor-controlled series capacitor (TCSC), thyristor-controlled phase shifter (TCPS), unified power flow controller (UPFC), and static var compensator (SVC). Test results on the 6 bus system with multi-type FACTS devices indicate that the proposed hybrid TS/SA approach can obtain better solutions than the sensitivity index approach.