Modified control of the matrix converter-based drive for voltage sag impact reduction

Faults in transmission and distribution networks often cause voltage sags. Direct matrix converter (DMC)- based drives are a new generation of electrical drives. Unlike the conventional two-stage diode supply-side inverter drive, the DMC drive has no direct current (DC) link capacitor and no capacitor charging-time delay before operation. The absence of a DC link makes the DMC-based drive more sensitive to voltage sags. The above-mentioned faults in transmission and distribution networks could degrade the DMC drive s performance and reliability. This paper investigates possible kinds and levels of voltage sags, dependency on network configuration, and the behavior of the DMC-based drive under abnormal input line-voltage conditions. Modification of the DMC drive control to reduce the influence of voltage sags is proposed and verified.

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