1. School of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039, China
2. Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China
3. Department of Energy, Politecnico di Torino, Torino 10129, Italy
4. School of Computer and Software Engineering, Xihua University, Chengdu 610039, China