A 3-Phase 4-Wire Voltage Sag Compensator Based on Three Dimensions Space Vector

Presently available voltage sag compensators are unable to handle neutral current caused by unbalanced and/or nonlinear loads or unbalanced source. In this paper, a 3-phase, 4-wire voltage sag compensator base on 3 dimensional voltage space vector is proposed which can handle the neutral current under voltage sag and nonlinear load conditions. A computer simulation model using PSIM has been developed to analyses the performance of the systems and its effectiveness to mitigate voltage sags