Optimal dynamic voltage restorer controller for voltage sag compensation

This paper proposes an optimal fuzzy logic controller for dynamic voltage restorer (DVR). The DVR is modeled by three phase voltage source inverter (VSI). Simulation is based on zero-order Sugeno fuzzy logic controller and particle swarm optimization (PSO) technique is used to optimally adjust its parameters. The proposed controlling approach is employed to compensate different level of voltage sag. The simulation results show the satisfactory performance of proposed controlling approach.