1. School of Electrical and Information Engineering, Anhui University of Technology, Maanshan 243032, China
2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
3. Electric Automation Research Institute, Anhui University of Science and Technology, Huainan 232001, China
4. Faculty of Physics, St. Petersburg State University, St. Petersburg 198504, Russia