1. School of Electrical and Electronics EngineeringNanyang Technological University50 Nanyang AveSingapore639798Singapore
2. Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of EducationShandong UniversityJi'nanPeople's Republic of China
3. State Grid Hunan Maintenance CompanyChangshaPeople's Republic of China
4. State Grid Hebei Power Supply CompanyShijiazhuangPeople's Republic of China