Abstract
Voltage is prone to oscillation in a DC microgrid because of interaction between the power converter and the remaining parts of the networks. For this issue, this paper develops an impedance modeling based on linearization method for stability analysis. It is found that the wideband oscillation is prone to occurring concluded from stability analysis. Furthermore, the impact of parameters on stability of the microgrid is studied. Besides, a new closed-loop control model is proposed based on the DC current control loop. It is found that the current loop includes a peak which may impact the voltage oscillations. It is because voltages are interacted with the currents. Based on this idea, a new amplitude compensation control strategy based on virtual inertia emulation is proposed to dampen oscillation of the voltages by shaping the amplitude of output impedance. And theoretical analysis show good feasibility of the proposed control. Finally, the proposed conceives are demonstrated by experiments.
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