1. State Grid Henan Electric Power Research Institute, Zhengzhou, 450052, P. R. China
2. The PLA General Hospital, P. R. China
3. Ningbo Weiji Electrical Power Technology Co., Ltd, P. R. China
4. State Grid Energy Conservation Service Co., Ltd, P. R. China
5. School of Physics and Information Engineering, Guangdong University of Education, 510303, P. R. China
6. State Grid Zhejiang Electric Power Research Institute, P. R. China