1. School of Control Science and Engineering and the Tianjin Key Laboratory of Intelligent Control of Electrical Equipment, Tiangong University, Tianjin, China
2. School of Control Science and Engineering, Tiangong University, Tianjin, China
3. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian, China
4. Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan