Abstract: Under the goal of ‘double carbon’, a new energy base mainly based on new energy is proposed. This paper takes the high-altitude Lela PV-Guwa hydropower complementary energy base as a template, and uses PSD-BPA software to carry out simulation and analysis. By analysing the behavioural characteristics of the hydropower and photovoltaic complementary power generation system under large disturbances of voltage faults, and small disturbances of frequency disturbances, it verifies that the project has the function of self-adjustment under the disturbance, and has the ability of voltage ride-through under the large disturbances, and under the small disturbances, the impacts of disturbances on the power grid can be effectively reduced by increasing the active power, so as to achieve the purpose of achieving stable operation of the grid. The project can effectively reduce the impact of disturbances on the power grid by increasing the active power under small disturbances, and achieve the purpose of achieving stable operation of the power grid.