Abstract
The virtual synchronous generator (VSG) has been widely studied due to its ability in simulating synchronous generator. From the perspective of output impedance, the harmonic interaction between grid and VSG-based inverters are analyzed in this paper. Firstly, the dynamic response between the outer loop and the inner loop of the VSG is analyzed. It is found that the dynamic response of inner loop is much faster than that of the outer loop. Therefore, the VSG output impedance model neglecting outer loop is established, which reveals that there is still a harmonic resonance risk for the grid-connected inverter using the VSG control strategy. Secondly, considering the influence of the low-order harmonics generated by the dead-band effect on the grid-connected current, this paper establishes an accurate VSG model considering the dead-band effect. Based on the established VSG accurate model, the output impedance of the multi-VSGs cluster is derived. It is found that the output impedance decreases with the increase of the paralleled VSGs, and the dead-band effect has more obvious influence on the grid-connected current. Finally, the correctness of the proposed output impedance model of VSG is verified by simulation.
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