1. School of Electronic and Information Engineering, Southwest University, Chongqing, China
2. Computer Information Systems Department, The State University of New York at Buffalo State, Buffalo, NY, USA
3. School of Automation, Chongqing University, Chongqing, China
4. College of Automation, Chongqing University of Posts and Telecommunications, Chongqing, China
5. Institute of Energy Technology, Aalborg University, Aalborg, Denmark