Abstract: To overcome the power consumption and fluctuation in the power transmission of a hydro-solar power system to ensure the stability of the power grid, we present a hydro-solar floating compensation method for compensating photoelectric random fluctuations successively, integrating the information of power quantity and output complementation, and identifying short-term power loss and fluctuating compensation power by using capacity information. On this basis, we develop a hierarchical scheduling model for maximizing medium- and long-term power consumption and taking into account the short-term risks of power abandonment and fluctuation. The results show that in comparison with short-term complementation, either medium- or long-term one can better allocate the time-capacity characteristics of hydropower and improve long-term consumption while taking into account short-term risks. A single-peak curve distribution relationship holds between the power consumption gain effect and the runoff guarantee rate, and the gain in the normal hydrological year is the most significant; the stability gain effect is positively correlated with the runoff guarantee rate, and it is the most obvious in the dry year. Thus, our method, by combining the effect preferences of both, can improve the applicability of scheduling decisions to different inflow scenarios.

Key words: hydro-solar power system, complementation mechanism, power consumption, power stability, short-term complementation, medium- and long-term complementation