1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China
2. Discipline of Engineering and Energy, Murdoch University, Perth, WA, Australia
3. School of Electrical Engineering and Automation, Chongqing University, Chongqing, China
4. Department of Automation, Shanghai Jiao Tong University, Shanghai, China
5. Kaplan Institute of Innovation and Tech Entrepreneurship and the Grainger Power Electronics and Motor Drives Laboratory, Illinois Tech., Chicago, IL, USA