1. School of Electrical & Electronic EngineeringNorth China Electric Power UniversityNo. 2, Beinong Road, Zhu Xin ZhuangBeijingPeople's Republic of China
2. China Electric Power Research InstituteRoad No. 15 at Qinghe XiaoyingBeijingPeople's Republic of China
3. State Grid Fujian Economic Research InstituteRoad No. 221 at XiufengFuzhouPeople's Republic of China