With the continuous increase of the peak-to-valley difference rate of electricity load of the utility grid, peak regulation of grid becomes increasingly difficult. Especially in some countries or regions where the proportion of secondary industry is low, due to the lower daily load rate and higher peak-to-valley difference rate of the daily load curve for the tertiary industry and the residents, the annual maximum peak-to-valley difference rate has reached 55% or more, and the load peak-to-valley difference brings huge demand for peak regulation.

The rapid expansion of installed capacity of new energy generation caused continually increasing of the proportion of new energy generation, but the utilization rate of new energy generation shows a gradual decline. In the case of the poor flexibility of cross-area DC operation mode, it is urgent to enhance the local absorption capacity of new energy generation to improve the utilization rate of new energy.