1. State Grid Liaoning, Electric Power Research Institute, Shenyang, China
2. Department of Control Science and Engineering, Zhejiang University, Hangzhou, China
3. Department of Electrical & Electronic Engineering, Imperial College London, London, U.K.
4. State Grid Smart Grid Research Institute Co., Ltd, Beijing, China
5. State Key Lab of Power Systems, Dept. of Electrical Engineering, Tsinghua University, Beijing, China