1. Foreign language Teaching Center, Guizhou Institute of Technology, Guiyang, People's Republic of China
2. Key Laboratory of Power Dig Data of Guizhou Province, School of Electrical and Information Engineering, Guizhou Institute of Technology, Guiyang, People's Republic of China
3. Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, School of Automation, Southeast University, Nanjing, People's Republic of China