Abstract: In the multi-energy complementary mode, the operation of hydropower-based flexible power sources will make a significant change to match the outputs of wind and solar power, thereby complicating the profit and loss relationship between different power generation entities. If the relationship between the different main entities is not clarified effectively or no compensation mechanism takes effect, it will be difficult to bring into play the enthusiasm of various power sources in participating in the integrated operation. This paper analyzes the profit and loss indexes of different power sources under three hydro-wind-solar power operation scenarios in the typical days of different seasons, and quantifies their profit and loss relationship, via a case study of a clean energy base in the lower Yalong River. The results show that under the multi-energy complementary operation mode, the total benefit of the hydro-wind-solar power system is increased significantly by 13.5% and 13.4%, along with a huge rise in the wind-solar power benefit of 123.3% and 146.0% in Scenarios 2 and 3, respectively, while the hydropower loses its benefit due to compensating for the other two sources by 0.33% and 3.21% for these two scenarios.

Key words: multi-power complementation, multi-entity, profit and loss relationship, clean energy, integration of hydropower, wind power and photovoltaic