Power grid connection settlement method, device and system and medium

The invention relates to the technical field of electric power cost settlement, in particular to an electric power grid-connected settlement method, device and system and a medium. According to the method, the power unit price is adjusted according to the power supply-demand relation every preset time, and each power unit price and the time period of each power unit price are recorded. When settlement is needed, an output power change curve of a power supply period is generated firstly, and then a plurality of corresponding intervals are divided in the output power change curve according to the time period of each power unit price. And calculating the generating capacity of each interval, and multiplying the generating capacity of each interval by the power unit price corresponding to the interval. And finally, summing the electric power fees of all the intervals, and settling the payable new energy power generation side fees. The benefit of one power supply cycle is calculated in multiple time periods, and t