CJEE

Chinese Journal of Electrical Engineering ›› 2015, Vol. 1 ›› Issue (1): 70-77.

• Orginal Article • Previous Articles     Next Articles

Multiple Operating Mode Analysis of Power Converter based on Graph Theory

Bo Zhang*, Dongyuan Qiu, Genyun Yi   

  1. School of Electric Power, South China University of Technology, Guangzhou, 510641, China
  • Online:2015-12-25 Published:2015-12-25
  • About author:Bo Zhang was born in Shanghai, China, in 1962. He received the B.S. degree in electrical engineering from Zhejiang University, Hanzhou, China, in 1982, the M.S. degree in power electronics from Southwest Jiaotong University, Chengdu, China, in 1988, and the Ph.D. degree in power electronics from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1994.
    He is currently a Professor in the School of Electric Power, South China University of Technology, Guangzhou, China. He has authored or coauthored 2 books in Wiley, more than 400 papers and 29 patents. His current research interests include nonlinear analysis and control of power supplies, wireless power transfer and ac drives.
    Dongyuan Qiu was born in China in 1972. She received the B.Sc. and M.Sc. degrees from South China University of Technology, Guangzhou, China, in 1994 and 1997, respectively, and the Ph.D. degree from the City University of Hong Kong, Kowloon, Hong Kong, in 2002.
    She is currently a Professor in the School of Electric Power, South China University of Technology. Her main research interests include sneak circuit analysis and fault diagnosis of power electronic systems, design and control of power converters. She has published one book and over 100 papers in these areas.
    Genyun Yi was born in China in 1986. She received the M.Sc. degrees from South China University of Technology, Guangzhou, China, in 2012. She is currently an engineer in State Grid, Jiangxi Province, China.
  • Supported by:
    epbzhang@scut.edu.cn

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Abstract: ：Power converters are the typical switched systems which operate based on the alternate switching of the semiconductor switches. The operating mode of power converters consists of several operating stages in one switching period. Each operating stage refers to a sub-circuit or equivalent circuit where different sub-circuits are switched in a fixed order according to the control strategy design. Power converter may operate in different operating modes even with the same control scheme, for example, the DC-DC converter has differing performance under the continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Thus, it is necessary to have a comprehensive understanding of the converter’s characteristics in advance to avoid undesired operation in practice. In this paper, the power converter is considered as a graph made up of several meshes. All sub-circuits in power converter can then be obtained by the mesh combination algorithm, and the operating mode can be constructed by considering the preset switching ON/OFF scheme. Ultimately, the typical waveforms in different modes can be predicted, which is useful to identify abnormal phenomena. Cúk converter is taken as an example to demonstrate the proposed multiple mode analysis method. It is found that there are four kinds of phenomena in addition to the well-known CCM and DCM. Finally, the experimental results are provided and show good agreement with the theoretical analysis.

Key words: Graph theory, multiple modes, power converter, sub-circuit, cúk.;