The multi-source and multi load power in DC micro-grids has strong nonlinearity and randomness

which has a significant impact on their voltage quality and stability. In response to the above issues

this paper proposes a stable control method based on power function tracking to address the challenges brought by nonlinear fluctuations of multiple sources and loads in DC micro-grids. This method first generates a power function tracking curve

and determines the power fluctuation limits for multiple sources and loads by analyzing the working characteristics of power function tracking control and the balance state of DC micro-grids operation. And taking the fluctuation limit as the boundary

this paper explores and designs optimization control strategies for different fluctuation ranges inside and outside the fluctuation limit. Afterwards

based on the Matlab/Simulink platform

a typical DC micro-grids structure is constructed

and the performance of the proposed control method is compared and simulated with the traditional droop control method under six operating conditions

taking into account the different fluctuation ranges of multiple sources and loads. Finally

the power function tracking control method

multi-source and multi load fluctuation range

and optimization control strategy are experimentally verified through a semi physical simulation system. The results indicate that the control method and optimized control strategy proposed in this paper significantly improve the dynamic response capability and stability of DC micro-grids.