1. State Key Lab of Power System, Department of Electrical Engineering Tsinghua University Beijing China
2. Department of Electrical Engineering North China Electric Power University Baoding China
3. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Beijing China
4. State Grid Xinjiang Electric Power Co., Ltd Urumqi China
5. State Grid Hebei Electric Power Co., Ltd Shijiazhuang China