Research on clean energy complementary power generation and optimal operation in Yalong river basin

Abstract Based on the general situation and development status of Yalong river clean energy demonstration base, the typical wind power stations, PV power stations and hydropower stations in the downstream of Yalong river are selected for research. Firstly, the principle of wind power, photovoltaic power and hydropower complementarity was analyzed, and the complementary characteristics of this three kinds of power sources in a daily time scale were explored. Secondly, in order to maximize the consumption of clean energy, ensure the operation safety of the grid and protect the cascade hydropower benefits, a mathematical model was built with the objective of the minimum load tracking difference index and the minimum total amount of water abandoned in the dispatching period, which was solved by two-layer nested optimization solution. The results show that the cascade hydropower of Yalong river has the ability to regulate the fluctuation of wind power output in the basin. The three kinds of power supply bundled out can provide stable and high quality electricity for the grid. The last, a new strategy for cascade hydropower operation after complementation was proposed, which can promote the realization of low carbon power dispatching and the optimization of energy structure.