This article focuses on providing the laminated busbar design guidance for a three-level T-type neutral-pointclamped (3L-TNPC) inverter to achieve low stray inductance and balanced inductance distribution between paralleled power switches. As a result, equalized dynamic current sharing can be accomplished. To discover the design strategy, this article first derives the mutual-inductance-decoupled equivalent circuit for 3L-TNPC. Then, the effects of each inductance item on switching performance can be unveiled, and the parametric targets are then summarized. Accordingly, the busbar design considerations are discussed. A step-by-step busbar design procedure to achieve the aforementioned design targets is provided in the next. The design procedure starts from 2-D optimization to achieve the optimal component and terminal allocation, and then, it increases the optimization degree to 3-D. Using this design procedure, we proposed a novel double-side-end busbar structure to achieve the busbar stray inductance of 12.7 nH and the inductance differences between the paralleled switches to be less than 2 nH. Extensive experiments are carried out in the end to evaluate the design procedure and demonstrate the performance of the busbar.

中文翻译：

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具有增强的动态电流共享的三级T型NPC电力电子积木叠片母线的设计和评估

本文致力于为三电平T型中性点钳位（3L-TNPC）逆变器提供层压母线设计指导，以实现低杂散电感和并联功率开关之间的平衡电感分布。结果，可以实现均衡的动态电流共享。为了发现设计策略，本文首先推导了用于3L-TNPC的互感去耦等效电路。然后，可以揭示每个电感项对开关性能的影响，然后总结参数目标。因此，讨论了母线设计注意事项。接下来提供实现上述设计目标的分步母线设计过程。设计过程从二维优化开始，以实现最佳的组件和端子分配，然后，它将优化度提高到3-D。使用此设计程序，我们提出了一种新颖的双侧母线结构，以使母线杂散电感达到12.7 nH，并联开关之间的电感差小于2 nH。最后进行了广泛的实验，以评估设计程序并证明母线的性能。