Abstract
In the DC microgrid, the power converter is the core device with the highest proportion in the system, and its characteristics also dominate the characteristics of the DC microgrid. Due to the lack of traditional generator sets in the DC microgrid, low inertia and weak damping also become the system main output characteristics. After research, it is found that after many power converters are connected to the DC microgrid, they will be affected by the line impedance and even the constant power load, and then the interaction will cause the DC bus voltage to resonate and collapse. Aiming at this problem, this paper proposes a method for analyzing the voltage resonance of the DC microgrid bus voltage based on the impedance model by constructing the impedance model of the DC microgrid, which effectively explains the generation mechanism of the resonance. Finally, the DC microgrid model is established in the simulation software, and the accuracy of the analysis method proposed in this paper is verified.
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