1. Associate Professor, Faculty of Electric Power Engineering, Kunming Univ. of Science and Technology, Kunming 650500, China (corresponding author).
2. Professor, State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, Dalian 116024, China.
3. Associate Professor, Faculty of Electric Power Engineering, Kunming Univ. of Science and Technology, Kunming 650500, China.
4. Lecturer, Faculty of Electric Power Engineering, Kunming Univ. of Science and Technology, Kunming 650500, China.