A Fast dynamic droop control strategy based on output impedance for DC microgrids

With the development of renewable and distributed energy sources, DC microgrids(Mgs) are widely used in various microgrid fields due to their advantages of no AC-DC conversion, high efficiency, and no harmonic, synchronization, and reactive power problems. In this paper, a dynamic droop control is proposed, where an additional dynamic droop term is added to the conventional droop control to form a two-degree-of-freedom droop structure, which improves the dynamic tracking performance of the system without affecting the power regulation of the conventional droop control. In this paper, the output impedance of the conventional droop control system is firstly pushed to in detail to demonstrate that the droop coefficient of the original droop system affects both the linearized power regulation performance and the dynamic performance. At the same time, the output impedance of the system of the proposed method is also pushed to the comparison of the output impedance of this method, and the dynamic parameters of the original system are improved by reasonable design parameters. Finally, simulations and experiments verify the correctness of the proposed method.