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Author(s): Yanqing Li, Yan Fu, Feilong Wang* School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071000, China International Journal of Smart Grid and Clean Energy, vol. 1, no. 1, September 2012: pp. 129–134 ISSN: 2315-4462 Digital Object Identifier: 10.12720/sgce.1.1.129-134