Coordinated Voltage-Power Control for DC Distribution Networks Based on an Uncertainty and Disturbance Estimator

DC distribution networks are low-inertia systems with a range of uncertainties and disturbances. The traditional droop control widely used in has contradiction between the accurate power sharing units voltage deviation due to presence line impedance. To overcome this enhance immunity tracking performance voltage-source converter (VSC) current inner loop PI control, paper proposes coordinated voltage-power strategy based on an uncertainty disturbance estimator (UDE) for networks. Firstly, improved UDE is proposed, which not only avoids influence impedance load sharing, but also achieves stabilization at set value. Secondly, VSC controller designed improve VSC’s output reference theory applied estimate compensate disturbances order robustness. Finally, three-terminal network taken as example verify effectiveness proposed strategy.