1. Shanxi Agricultural University,Department of Basic Sciences,Jinzhong,China,030800
2. Hunan University of Science and Technology,School of Information and Electrical Engineering,Changsha,China,410205
3. Shanxi Normal University,School of Mathematics and Computer Science,Taiyuan,China,030031
4. Taiyuan University of Technology,College of Electrical and Power Engineering,Taiyuan,China,030024
5. Taiyuan University of Technology Shanxi Energy Internet Research Institute,College of Electrical and Power Engineering,Taiyuan,China,Shanxi