Dynamic Multi-Time-Scale Energy Model of Cascaded System Considering Power Interaction

Le résumé fourni par la source

The dc-dc cascaded system is a typical structure in dc distribution systems. However, the differences in operating frequencies among various stages and the incomplete decoupling of bus capacitors can lead to the coexistence of multiple-time-scale variables within the same system, rendering traditional periodic models inadequate. To address this issue, taking a cascaded inductive wireless power transfer (IPT) with a four-switch buckboost (FSBB) converter as an example, this paper proposes a multi-time-scale energy model based on the port energy transfer principle, which has a high accuracy over 98.9%. Through timescale unification and mode transformation, the dynamic response of the system can be accurately tracked without the need for load voltage or current sampling. Moreover, compared to periodic models, the proposed full-mode control strategy based on the energy model eliminates the need for multi-variable control of high-order systems, effectively reducing computational burden. A FSBB-IPT prototype is built to verify the effectiveness and advantages of the proposed energy model.

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