1. State Key Laboratory of Alternative Electric Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China
2. Jiangsu Provincial Key Laboratory of Renewable Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics, Nanjing, China
3. Guangdong Engineering Technology Research Centre of Power Equipment Reliability in Complicated Coastal Environments, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
4. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, USA