1. School of Electrical Engineering, Southwest Jiaotong UniversityChengdu611756People's Republic of China
2. Guangzhou Power Supply BureauGuangdong Power Grid CorporationGuangzhou510600People's Republic of China
3. College of EngineeringQufu Normal UniversityRizhao276825People's Republic of China
4. Department of Protection and AutomationState Grid Sichuan Electrical Power Research InstituteChengdu610072People's Republic of China