1. Senior Engineer, Power Grid Technology Center, Sate Grid Hunan Electric Power Corporation Limited Research Institute, Changsha, Hunan 410007, China.
2. Research Associate, Dept. of Electrical Engineering, Southern Methodist Univ., Dallas, TX 75205 (corresponding author). ORCID: .
3. School of Electrical Engineering, Wuhan Univ., Wuhan, Hubei 430072, China.