An effective allocation of the reactive power in an electrical network aims generally to improve the voltages profile and control transmission losses. This paper proposes an application of the Particle Swarm Optimization method (PSO) to Reactive Power Planning (RPP) using Static Var Compensator (SVC) and Thyristor Controlled Series Compensator (TCSC). The Fast Voltage Stability Index (FVSI) is used to identify the critical lines and buses to install the FACTS controllers. The methodology has been tested in the Algerian electrical power systems 114 bus, and the simulation results show the effectiveness of the proposed approach for improving the reactive power planning problem.
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