Abstract
The dc–dc converters are connected in parallel to feed the utility loads in many applications like the dc microgrid, the photovoltaic-battery hybrid power system, etc. Since the power sources usually connected to a dc bus through power electronics converters, the dynamics of the whole system is complex and the stability issues would be critical. In this brief, a large-signal modeling and stability analysis is performed to such system using the controlled current sources to represent the parallel-connected converters. The mixed potential theory-based stability criterion is then generated with the simplified model. The design-oriented analysis of the key system parameters is developed through the large-signal stability criterion and the power constrains. The analysis results are verified by the circuit simulations and the hardware-in-the-loop experiment of a dc–dc system with parallel-connected switching power converters.
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