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ABSTRACT
In this paper, the design method of CLC filter for current source inverter (CSI) is discussed. This inverter is basically for photovoltaic system with small power which is also called micro-inverter. For better performance of small power inverter, flyback-type converter-side topology is determined and it operates as CSI because it has inductor inside. The CLC filter is the output filter for this CSI. Mostly, the components’ capacity and system size are regarded as key factors when evaluating small-powered systems. The CLC filter is made with an additional capacitor to a conventional CL filter. The proposed CLC filter assures the same or the better performance on current ripple reduction than the CL filter. Hence, according to this output filter benefits, the micro-inverter system can be smaller and cost down. The passive damping methods are also analysed upon the positions of resistive damping in the filter circuit. Among four different damping methods according to the resisters’ position, the optimal damping method which has the lowest power consumption is applied to the proposed CLC filter and the effect of this method is also analysed. Performance of the proposed CLC filter is verified with simulation and experiment and the results also show the validity of passive damping method.
ACKNOWLEDGEMENTS
This work was supported in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning [2016R1A2B4010636] and in part by the R&D Program of the Korea Railroad Research Institute, Republic of Korea.
Additional information
Notes on contributors
Yesl Shin
Yesl Shin received the BS and MS degrees in electrical and computer engineering from the Ajou University, Korea, in 2012 and 2014, respectively. She is currently working at LG Electronics.
E-mail: [email protected]
June-Seok Lee
June-Seok Lee received the BS, MS, and PhD degrees in electrical and computer engineering from the Ajou University, Korea, in 2011, 2013, and 2015, respectively. He is currently working at Korea Railroad Research Institute. His research interests include grid-connected systems, multilevel inverter, and reliability.
E-mail: [email protected]
Kyo-Beum Lee
Kyo-Beum Lee received the BS and MS degrees in electrical and electronic engineering from the Ajou University, Korea, in 1997 and 1999, respectively. He received the Ph.D. degree in electrical engineering from the Korea University, Korea in 2003. From 2003 to 2006, he was with the Institute of Energy Technology, Aalborg University, Aalborg, Denmark. From 2006 to 2007, he was with the Division of Electronics and Information Engineering, Chonbuk National University, Jeonju, South Korea. In 2007, he joined the School of Electrical and Computer Engineering, Ajou University. He is an associate editor of the IEEE Transactions on Power Electronics, Journal of Power Electronics, and Journal of Electrical Engineering & Technology. His research interests include electric machine drives, electric vehicles, and renewable power generations, and electric vehicle applications.
E-mail: [email protected]