Abstract
We propose an asymmetric backlash based plug-and-play realization of the virtual infinite capacitor (VIC), which is an active nonlinear capacitor realized using a bidirectional converter, meant for DC voltage filtering (ripple elimination). The VIC can replace large, expensive and unreliable electrolytic capacitors, and is mainly intended for applications where random fluctuations of the DC bus voltage may occur, as it does not target on one particular ripple frequency. The plug-and-play (PnP) VIC can be connected directly to the DC bus like a passive filtering capacitor, no extra connections are needed. This is achieved by a backlash based adaptive voltage reference generation mechanism, proposed in this paper. In steady state, the generated voltage reference will be equal to the equilibrium voltage of the DC bus (i.e., the constant DC bus voltage at which current supply and current demand are equal). It is revealed that the backlash-based PnP VIC is equivalent to a hybrid system switching between three sub-systems. Based on this, we have investigated the output impedance of the PnP VIC. For the stability of complex interconnected systems, it is recommended that the output impedance of the PnP VIC should be positive-real. This property is guaranteed by the novel backlash algorithm. The results are tested by simulation.
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