Abstract
In the DC microgrid, the grid-connected converter, as the interface between the DC grid and the AC grid, is the key to connecting the AC grid and the DC grid. This article analyzes the influence of the virtual inertia control on the DC side and the AC side on the DC bus. First, establish the AC side power-frequency relationship and the DC side power-voltage relationship of the grid-connected converter, derive the theory and give the control block diagram. Secondly, the small signal analysis of the system is carried out to obtain the transfer function of the inertia value and the DC bus voltage, and the influence of the virtual inertia of the AC side and the virtual inertia of the DC side on the DC microgrid bus voltage is compared and analyzed. Finally, simulation in MATLAB, the results verify the theoretical analysis, the introduction of virtual inertia on the AC side also brings the DC bus voltage inertia, and the greater the inertia value, the greater the bus voltage inertia, but the greater the inertia will cause the DC bus voltage fluctuations. In the case of the same power inertia, the DC virtual inertia control does not cause fluctuations in the bus voltage, and the greater the inertia value, the longer the DC bus voltage transition time and the greater the inertia.KeywordsDC microgridVSG controlSmall signal modelT-type three-level inverter
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