Control Strategy for Shunt Active Power Filter Using Hybrid Multi-level Inverter in AC Electrified Railway Systems

Abstract

The AC electrified railway systems have the power quality problems such as the harmonic current pollution and the reactive power demand, which are due to the inherent load characteristics of locomotives. The electrical nonlinearity and the single-phase moving load features of locomotives produce large amount of the harmonic current and the reactive power demand. This paper presents a shunt active power filter (SAPF) adopting hybrid multi-level inverter and a novel control algorithm based on the synchronous reference frame and the phase-shifted carrier PWM to improve the power quality in the AC electrified railway systems. The proposed SAPF and its control algorithm are investigated in the autotransformer-fed AC electrified railway application. The validity and the effectiveness of the proposed SAPF and the control algorithm are demonstrated through the case study.

Keywords:

• Active power filter
• Autotransformer
• Electrified railway
• Multi-level inverter
• Power quality
• Synchronous reference frame

Additional information

Notes on contributors

Haneol Park

Haneol Park was born in Korea in 1980. He received B.S. and M.S. degrees in electrical engineering in 2006 and 2008, and Ph. D. in railway electrical and signaling engineering in 2011 from Seoul National University of Science and Technology. He was an Associate Professor in the department of New & Renewable Energy Engineering at Kundong University, Korea, from 2011 to 2012. Since 2012, he has been working as a research engineer for Unison Co., Korea. His primary research interests are renewable energy PCS, electrified railway systems, power quality, and power converters. E-mail: [email protected]

Jungho Han

Jungho Han was born in Korea in 1984. He received B.S. degree in electrical engineering and M.S. degree in railway electrical and signaling engineering from Seoul National University of Science and Technology, Seoul, Korea, in 2009 and 2011, where he is currently working toward his Ph.D. degree in railway electrical and signaling engineering. He has primary research interests on power quality of railway systems, electric machine drives, and renewable energy systems. E-mail: [email protected]

Joongho Song

Joongho Song was born in Korea in 1957. He received B.S. and M.S. degrees in electrical engineering from Seoul National University in 1980 and 1982, and his Ph. D. from KAIST, Korea, in 1993. He worked as an engineer for E-Hwa Electrical Co., Korea, from 1982 to 1985. From 1982 to 2002, he was with the Intelligent System Control Research Center, Korea Institute of Science and Technology. He was a visiting scholar at the University of Wisconsin-Madison from 1995 to 1996. Since 2002, He has been an Associate Professor in the department of Electrical Engineering & Information Technology at Seoul National University of Science and Technology, Korea. His primary research interests include switching converter, electric machine drives, and renewable energy technologies. E-mail: [email protected]