Abstract
In order to enhance the anti-disturbance capability of a DC microgrid, the virtual DC machine control (VDMC) is usually utilized. However, the existing literature on VDMC mainly focuses on the small-signal modeling based on linearization technique, which cannot be used to describe the system dynamics under large disturbance. Furthermore, the power electronics-based loads have the features of constant power characteristic, which increases the nonlinear of the DC microgrid. In such case, it becomes difficult to obtain the system stability region accurately via the small-signal methods. To settle such problem, the simplified large-signal model of the DC microgrid system with VDMC is established via the TS fuzzy modelling method. Thereupon, an approach to estimate the asymptotic stability region of the system is put forward. The region of asymptotic stability can be used to estimate the maximum undertaking changes of both the DC bus voltage and load power. Finally, the accuracy of the proposed model and the effectiveness of the presented methods are verified by simulations and experiments.
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