Abstract: Aiming at the stability and coordination of DC microgrid with mixed load formed by renewable energy aggregation,a new control algorithm combining passive control and improved nonlinear disturbance observer feedforward compensation is proposed,which not only eliminates the influence of constant power load on DC microgrid,but also improves the system robustness,Then the line impedance compensation is used to improve the shunt accuracy and realize no voltage deviation. The research uses Matlab/Simulink to build a parallel DC-DC converter,simulation model for verification. By comparing the traditional passive control and proportional integral regulation passive control,it is shown that the proposed control strategy suppresses the influence of constant power load and line impedance. Finally,the effectiveness of the strategy was verified on the Opal-RT semi-physical experiment platform.