1. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
2. Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
3. Department of Electric Power Engineering, Xi’an Jiaotong University, Xi’an 710061, China
4. Economic and Technological Research Institute, State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830063, China
5. State Grid Shandong Electric Power Co., Ltd., Jinan 250013, China