In this paper, the voltage sag compensation by parallel type compensator with series inductor is presented. The parallel type compensator injects the current into the system so that the voltage across the series inductor can instantaneously compensate the voltage at the load. The three types of current injection control schemes are explained, analyzed and compared. The effect and solution for compensating voltage sags by parallel type compensator with series inductor are explained. Simulations of voltage sag compensation demonstrated the validation of the proposed control schemes.
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