To solve the voltage stability problem caused by large disturbances caused by random nonlinear loads such as distributed power supply and electric vehicles connected to the DC microgrid

the ultra-local sliding mode control strategy of double-active-bridge converter is proposed in this paper. Based on the ultra-local model

combined with the sliding mode control with simple control

strong robustness and good dynamic performance

the ultra-local sliding mode controller is designed by using the power variable speed reaching law. Then

to accurately observe unknown terms in the model

a sliding mode observer with variable speed reaching law is designed for real-time estimation. Then

the Lyapunov stability theory is applied to prove the stability of the designed controller. Finally

the effectiveness and superiority of the proposed control strategy are verified by simulation and experiments

namely

speeding up the adjustment speed

improving the steady-state performance of the system

and enhancing the robustness of the system.