1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
2. North China Electric Power University
3. Beijing 102206
4. P. R. China
5. Energy System Engineering Department
6. NAAM Research Group
7. Department of Mathematics
8. Faculty of Science
9. King Abdulaziz University
10. Jeddah
11. Fujian Provincial Key Laboratory of Photoelectric Functional Materials
12. Institute of Materials Physical Chemistry
13. Huaqiao University
14. Xiamen 361021
15. China
16. Institute of Materials Science & Engineering
17. University of Washington
18. Seattle
19. USA