1. College of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
2. Institute of Electronic and Information Systems, Novgorod State University, Veliky Novgorod 173003, Russia
3. State Grid of Jiangsu Electric Power Co., Ltd. Nanjing 210024, China
4. Physics Department, Oakland University, Rochester, Michigan 48309, USA