1. Faculty of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology, 541004 Guilin, China
2. College of Optoelectronic Engineering and Key Laboratory of Optoelectronic Technology & Systems Education Ministry of China, Chongqing University, 400044 Chongqing, China
3. School of Electrical Engineering and State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 400044 Chongqing, China