[1] Guangxi Power Grid Corp, Elect Power Res Inst, Nanning 530023, Peoples R China
[2] Chongqing Univ, Coll Automat, Chongqing 400044, Peoples R China
[3] Chongqing Univ, Minist Educ, Key Lab Dependable Serv Comp, Cyber Phys Soc, Chongqing 400044, Peoples R China