1. Utilization of Clean Energy(Tus-Institute for Renewable Energy), Qinghai University,Qinghai Key Lab of Efficient,Xining,China,810016
2. Qinghai Xining Power Generation Branch of Huanghe Hydropower,Xining,China,811600
3. Tsinghua University,State Key Laboratory of Control and Simulation of Power System and Power,Generation Equipment Electric Machinery Department,Beijing,China,100091