Abstract
This paper studies intermittent instabilities in parallel power system. Taking parallel buck converters with coupled interference signals as an example, model and actual system are established. By numerical simulation, the nonlinear behaviours are captured under some conditions. Characteristics and mechanism of intermittency are depicted by nonlinear theory. In this paper, mappings time to parameter are established and discrete iterative mappings for nonlinear systems are derived. All the simulation results are consistent with the theoretical analysis results. The research method adopted in the paper is applicable for the other parallel powersystems. The conclusion can provide a reference for the parallel converters to maintain stable operation and serves as a theoretical basis for further optimization design and system control.
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