1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
2. Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China
3. Wuwei Occupational College, Wuwei 733000, China
4. Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Normal University, Xi’an 710119, China