AUTHOR=Hu Shuai , Xiang Yue , Liu Junyong , Li Jianhua , Liu Chang 

TITLE=A Two-Stage Dispatching Method for Wind-Hydropower-Pumped Storage Integrated Power Systems

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 9 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.646975

DOI=10.3389/fenrg.2021.646975

ISSN=2296-598X

ABSTRACT=With the fossil energy crisis and environmental pollution, wind energy and other renewable energy have been booming. However, its strong intermittence and volatility make wind power integration difficult. To solve this problem, this study proposes a complementary power generation model of wind-hydropower-pumped storage systems, which uses hydropower and pumped storage to adjust the fluctuation of wind power. How to consider the uncertainty and unpredictability of wind power output and make more reliable hydropower generation plan and pumped storage generation plan is the key problem to be solved in the grid with the high proportion of renewable energy. The martingale model of forecast evolution is used to describe the uncertainty evolution of wind power in different regions. According to the flexible load in the region, the flexibility index is used to quantify flexibility, and the transaction price is set to be proportional to flexibility. The two-stage framework of day-ahead and real-time dispatching model is then developed. In the day-ahead market, different regions trade with each other. If electricity after trading is imbalanced, it will be supplemented by hydropower and the grid to meet electricity demand. In the real-time market, the pumped storage is added to balance quickly the deviation of wind power and load between the real-time and day-ahead markets. Finally, considering the positive effect of hydropower on wind power consumption in the grid, a benefit allocation method based on improved Shapley value method is proposed. The actual data in Southwest China are used to verify the rationality of the proposed dispatching model and the benefit allocation method. After the cooperation of hydropower and pumped storage, the average revenue growth is 3.02%. The improved benefit allocation scheme makes more benefit of hydropower and pumped storage and promotes the cooperation of multi-participants.