A Multiobjective optimal VAR dispatch using FACTS devices considering voltage stability and contingency analysis

Abstract An effective allocation of the reactive power in an electrical network aims generally to improve the voltage profile, to minimize transmission losses, and\or to maximize the network voltage stability margin. To solve this kind of problem a hybrid technique combining particle swarm optimization and gravitational search algorithm (PSO-GSA) is proposed. The essential goal of this study is to ensure the feasibility of the power system in the state of contingencies. Therefore we will consider unfavorable cases to prepare, prevent, and plan the system to deal with any incidents. The proposed program will provide a solution to any variation occurring in the transport of energy or suggested to be studied. For this purpose two critical situations are simulated and studied. Also, this study considers the installation of two different flexible alternating current transmission systems devices, namely, the static volt ampere reactive compensator and the thyristor controlled series compensator. To identify the location of the latter, two stability index methods are used, namely, fast voltage stability index and line stability index. The proposed method is applied on the equivalent Algerian electric power system 114-bus. The obtained results are compared with PSO and GSA separately. The results obtained by the proposed method show its effectiveness for improving the reactive power planning problem.

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