Key Laboratory Energy monitoring and Edge Computing for Smart City of Hunan Province, China; Natural Science Foundation of Hunan Province, ChinaNatural Science Foundation of Hunan Province [2017JJ2126]; Scientific Research Program of the Education Department in Hunan Province, China [19B294, 18A410]; Science and Technology Program of Loudi City, Hunan Province, China [2018KJ004]; Innovative Research Program for Postgraduates of Hunan Province, China [CX20200204]; Research Learning and Innovative Experiment Project of University Students in Hunan Province, China [752]