1. College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao, China
2. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, China
3. Qingdao Innovation and Development Center of Harbin Engineering University, Qingdao, China
4. College of Energy Storage Technology, Shandong University of Science and Technology, Qingdao, China