1. School of Information and Electronic Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
2. School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, HangZhou 310023, China
3. Department of Electrical Engineering and Energy Technology, University of Vaasa, Vaasa 65101, Finland
4. Department of Civil Engineering, Aalto University, Espoo 02130, Finland
5. Solita Ltd., Oulu 90100, Finland