Research on Multi-Objective Complementary Operation of Wind-Photovoltaic-Cascade Hydropower Integrated System

This paper takes three kinds of renewable energy sources, namely cascade hydropower, wind power and photovoltaic power, as research objects, and explores the short-term scheduling of hydro-wind-photovoltaic complementary system based on the characteristics of energy forms and their operation. Firstly, considering the randomness of wind power and photovoltaic, a typical scenario generation model for wind power and photovoltaic is established with the help of Latin hypercube sampling and the fast backward reduction algorithm, which concludes that there is a certain degree of complementarity between wind power and photovoltaic, but the degree is weak, and even exacerbates the fluctuation of system output, so that cascade hydropower is added as a flexible power source for compensatory regulation. Taking the minimum fluctuation of residual load and maximum utilization of water resources as objective functions, a hydro-wind-photovoltaic complementary scheduling model is established, and solved by the GUROBI solver. The results show that when cascade hydropower participates in dispatching, the fluctuation of residual load is reduced, which has obvious effect on calming the fluctuation of wind power and photovoltaic, which not only enhances the power grid's ability to track load changes, but also maintains the stability of the system.