Abstract
In order to suppress the fluctuation of the bus voltage in a DC microgrid, the virtual DC machine technology can be applied to the DC converter. However, it is difficult for the conventional control method of virtual DC machine to ensure good dynamic performance, since its parameters usually keep constant. To settle such problem, this paper proposes a parameter-adaptive virtual DC machine control strategy. Firstly, the small signal model of a typical buck converter with virtual DC machine control is established. Based on the proposed model, the bode diagrams of the system are drawn. Secondly, the effects of the inertia and damping coefficients of the virtual DC machine on the DC bus are analyzed in detail.The adaptive control of virtual DC machine parameters is then proposed, giving the principles of adaptive adjustment of inertia and damping coefficients. Finally, simulations are carried out to validate the effectiveness of the proposed method.
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