[Cong, Lin;Yang, Jialin;Zhou, Xichao] State Grid Integrated Energy Serv Grp Co Ltd, Beijing, Peoples R China.^[Shi, Liguo] State Grid Qingdao Power Supply Co, Qingdao, Shandong, Peoples R China.^[Liu, Libo;Jiang, Fei] Changsha Univ Sci & Technol, Changsha, Peoples R China.^[Zhang, Aiqun] State Grid Shandong Elect Power Co, Qingdao, Shandong, Peoples R China.