1. School of Electrical EngineeringZhejiang UniversityHangzhou310027People's Republic of China
2. Zhejiang Huayun Electric Power Engineering Design Consulting Co. LtdHangzhou310014People's Republic of China
3. Department of Electrical and Electronic EngineeringUniversiti Teknologi BruneiBandar Seri BegawanBE1410Brunei
4. Electric Power Research InstituteChina Southern Power GirdGuangzhou510080People's Republic of China