1. School of Electrical Engineering, Xi’an University of Technology, Xi’an, China
2. School of Electrical Engineering and Automation, Anhui University, Hefei, China
3. State Grid Xi’an Electric Power Supply Company, Xi’an, China
4. Xi’an Jinze Electric Technology Company Ltd., Xi’an, China
5. School of Electrical and Electronic Engineering, Nanyang Technological University, Jurong West, Singapore