DC Power Networks with Very Low Capacitances for Transportation Systems: Dynamic Behavior Analysis

It is known that conventional analysis based on average models can be used only if the cutoff frequency of the filter is much lower than the switching frequency. For networks with very low capacitances, other tools are required for analyzing the behavior of the system because the cutoff frequency is close to the switching frequency. Such a tool is proposed in this paper and is applied to predict chaotic, multi-periodic or stable behavior of the system. A DC power system constituted by a DC power source supplying a LC filter connected to a tightly controlled load is studied. A very low capacitance is provided such that the switching effects due to power electronics device can no more be neglected. Experimental results confirm the validity of the proposed tool.