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Operating Principle and Performance Optimization of a Three-Level NPC Dual-Active-Bridge DC–DC Converter

机译:三电平NPC双有源桥DC-DC转换器的工作原理和性能优化

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Aiming to improve the performance features of conventional two-level dual-active-bridge (DAB) converters, this paper presents a three-level neutral-point-clamped (NPC) DAB dc–dc converter. A general modulation pattern is initially defined, the dc-link capacitor voltage balancing is analyzed in detail, and a proper balancing control is designed. Then, a set of decoupled optimization problems is formulated as a function of the available modulation degrees of freedom to minimize the predominant converter losses. Finally, a simple and practical specific modulation strategy is provided, resembling the optimum solutions. The good performance of the proposed three-level NPC DAB converter operated with the proposed modulation strategy and voltage balancing control is verified through simulation and experiments. The capacitor voltage balancing can be guaranteed for all operating conditions. In addition, it is concluded that the multilevel topology provides benefits compared with the conventional two-level DAB converter.
机译:为了改善常规两电平双有源桥(DAB)转换器的性能,本文提出了一种三电平中性点钳位(NPC)DAB dc-dc转换器。最初定义了一般的调制模式,详细分析了直流链路电容器的电压平衡,并设计了适当的平衡控制。然后,根据可用的调制自由度来制定一组解耦的优化问题,以最大程度地减少主要的转换器损耗。最后,提供了一种简单实用的特殊调制策略,类似于最佳解决方案。通过仿真和实验验证了所提出的三电平NPC DAB转换器在所提出的调制策略和电压平衡控制下的良好性能。可以在所有工作条件下保证电容器电压平衡。此外,得出的结论是,与传统的两级DAB转换器相比,多级拓扑提供了很多好处。

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