1. Nanyang Technological University,School of Electrical and Electronic Engineering,Singapore,Singapore
2. Xi’an Jiaotong University,School of Electrical Engineering State Key Laboratory of EIPE,Xi’an,China
3. Huazhong University of Sci. and Tech.,School of Electrical and Electronic Engineering,Wuhan,China
4. Power Research Institute State Grid Shandong,State Grid Shandong Electric,Jinan,China