J. of Advanced Engineering and Technology, Vol. 5, No. 4 (2012) pp. 303-307
This paper presents a new type of voltage swell/sag compensator based on single-phase quasi-Z-source AC-AC converter. The proposed system employs a PWM quasi-Z-source AC-AC converter along with a transformer. A commutation strategy to drive the AC-AC converter is employed to realize snubberless operation. Circuit analysis and operating principle are provided. Simulation and experimental results at 20% voltage swell and 60% voltage sag are shown.
Keywords: Voltage sag/swell, Compensator, Z-source converter, Quasi-Z-source converter, Transformer