Instant voltage compensator based on a three‐leg converter. Issue 8 (1st September 2013)

• Record Type: Journal Article
• Authors: Kwon, Jung‐Min; Kim, Kyu‐Tae; Kwon, Bong‐Hwan
• Is Part Of: IET power electronics. Volume 6:Issue 8(2013)
• Page Start: 1618
• Page End: 1625
• Publication Date: 2013-09-01
• Subjects: AC‐AC power convertors -- compensation -- PI control -- power supply quality -- voltage control; power 3 kW -- line voltage -- voltage sag -- integral control -- weighted‐error proportional control -- high switching frequency control -- power conversion efficiency -- buck converter -- line voltage -- boost converter -- cost reduction -- large energy storage elements -- single AC‐AC power conversion -- three‐leg converter‐based IVC -- three‐leg converter‐based instant voltage compensator; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2012.0325
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : This study proposes an instant voltage compensator (IVC)‐based on a three‐leg converter. It provides single ac–ac power conversion without large energy storage elements, so the size and cost are reduced. It operates as a boost converter when the line voltage is lower than the rated output voltage and as a buck converter when the line voltage is higher than the rated output voltage. Only one leg among the three legs is switched at a high frequency, whereas the other legs are switched at the line frequency. Therefore the power conversion efficiency is higher than that of a conventional IVC where all of the legs are controlled by a high switching frequency. The output voltage is regulated faster using a weighted‐error proportional and integral controller. Experimental results are obtained with a 3 kW prototype to verify that the proposed IVC quickly compensates for the voltage sag and swell of the line voltage.