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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
Title DC-link Voltage Ripple Compensation Method for Single Phase 3-level PWM Converters
Authors Hee-Myun Lee ; Dong-Myung Lee
DOI http://dx.doi.org/10.5207/JIEIE.2013.27.4.008
Page pp.8-15
ISSN 1225-1135
Keywords PWM Converter ; Multi-level Systems ; DC-link Voltage Ripple Compensation
Abstract This paper proposes a DC-link voltage variation compensation method for a 3-level single phase converter for high-speed trains. Since 3-level NPC(Neutral Point Clamped) type converters have the split DC-link causing the inherent problem of voltage fluctuations in the upper and lower capacitors, reducing the voltage difference between the top and bottom capacitors is required. In this paper, compensation time proportional to the voltage difference is added to PWM switching time to solve the voltage variation. The compensation time is obtained by a PI controller. Simulation results demonstrate the validity of the proposed method.