关键词: 水能资源开发;机组改造;电站扩机;水库群优化调度;长江流域;

Abstract: To promote the development and rational utilization of hydropower resources in China in the new stage, the current utilization situations of hydropower resources, and the opportunities and challenges after the wind-solar energy connected to the power grid are analyzed.Subsequently, taking the Changjiang River Basin as the research object and selecting some typical cases in the basin, we put forward some ways to expand the rational utilization of hydropower resources, such as increasing capacity, expanding turbine number and conducting optimal dispatching among reservoirs.Relevant suggestions are put forward from the perspectives of policy support, electricity price formation mechanism, joint dispatch and management among hydro-wind-solar power.Results showed that:(1) There are no obvious constraints on increasing the capacity of existing hydropower units, which has a broad prospect.(2) Expanding turbine numbers meets the requirements of green energy transformation, and plays a significant role in improving the energy and capacity benefit of hydropower stations, and enhancing the operational flexibility of units.(3) Conducting optimal operation of hydropower can not only give a full play to the comprehensive benefits of hydropower projects themselves, but also further release their regulatory performance by the joint dispatching among hydro-wind-solar power.

Key words: hydropower resources utilization; capacity expansion of hydropower unit; expansion of hydropower units number; reservoirs operation optimization; Changjiang River Basin;