Abstract
DC cascaded converters system with multi-load converters is the most dominant connection among microgrids, renewable energy systems and DC distribution power systems. In this paper, coexistence of fast-scale and slow-scale instabilities is analyzed in a DC cascade converters system which is contained of one source converter with three load converters. To simplicity, all of the load converters are considered as constant power loads and the discrete mapping of the DC cascaded converters system is established. Then, the bifurcation behaviors and the coexisting fast-scale and slow-scale instabilities are found. Finally, the coexisting fast-scale and slow-scale instabilities are verified by simulation and experiment analysis.
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