Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Single-Phase Series Type Quasi Z-Source Voltage Sag-Swell Compensator for Voltage Compensation of Entire Region
Authors Jun-Hyun Eom ; Young-Gook Jung ; Young-Cheol Lim
DOI 10.6113/TKPE/2013.18.4.322
Page pp.322-332
ISSN 1229-2214
Keywords voltage sag/swell compensation; entire compensation region; quasi Z-source AC-AC converter; series connection of output terminal; intersection switching control; voltage compensation factor; THD
Abstract Conventional single-phase series quasi Z-source voltage compensator can not compensate for voltage sag less than 50% that frequently occurs in the industrial field. In this study, single-phase series quasi Z-source voltage sag-swell compensator which can compensate the voltage variation of entire range is proposed. The proposed system is composed of two quasi Z-source AC-AC converters connected in series with output terminal stage. Voltage sag less than 50% could be compensated by the intersection switching control of the upper converter duty ratio and of the upper converter duty ratio. Also the compensation voltage and its flowchart for each compensation mode are presented for entire sag-swell region. To confirm the validity of the proposed system, a DSP(DSP28335) controlled experimental system was manufactured. As a result, the proposed system could compensate for the voltage sag/swell of 20% and 60%. Finally, voltage compensation factor and THD(Total Harmonic Distortion) according to voltage variation and load change were measured, and voltage quality shows a good results.