1. Polytechnic Institute, Zhejiang University, Hangzhou, Zhejiang 310015, China
2. Inner Mongolia Power Research Institute, Hohhot, Inner Mongolia 010020, China
3. Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System, Hohhot, Inner Mongolia 010020, China
4. Inner Mongolia Borelles Electric Power Engineering Design Co., Ltd., Hohhot, Inner Mongolia 010010, China