Stability analysis of cascade hydro-photovoltaic complementation power system in cascade hydropower station

In order to realize the sustainable development of "green, low-carbon, safe and efficient" energy, China has put forward the "Double Carbon" target in 2020. New energy projects will usher in a new round of development peak in the "14th Five-year Plan", and a new power system with new energy as the main body is rapidly taking shape. A variety of complementary power generation systems composed of clean energy will reduce the unstable operation of the power grid caused by large-scale new energy projects connected to the power system. This paper analyzes the advantages of the cascade hydro photovoltaic complementation power system from the aspects of the cascade hydro-photovoltaic complementation principle, the characteristics of hydropower station and photovoltaic, the model of the cascade hydro-photovoltaic complementation power system, and the security and stability analysis of the power grid. The analysis results show that the cascade hydropower stations use the cascade reservoirs to improve the hydropower regulation capacity of the basin, so as to improve the power supply quality of the power grid. Taking advantage of the flexibility of cascade hydropower dispatching and rapid adaptation to load changes, photovoltaic projects are developed in the mode of hydro-photovoltaic complementation to reduce the impact of large-scale photovoltaic project access on the stable operation of the power grid.