The paralleling of power converters connected to the grid for power-sharing is a widely used technique. In this context, the design framework for a low-cost, lightweight, compact and high-performance optimum configuration is an open problem. This paper proposes an innovative Multi-Objective Hierarchical Optimization Design Framework (MO-HO-DF) for an AC grid interface with N interleaved H-bridges, each with M parallel “to-be-determined” switches, connected through coupling inductances (L f ). A total of eight figures of merit (FOMs) were identified for the design framework optimization. A rigorous model of the power electronic system is presented. Next, a highly computationally efficient algorithm for the estimation of the required frequency modulation ratio (m f ) to meet current harmonic performance requirements for any given configuration is proposed. Then, the concept and implementation of the algorithm are presented for the MO-HO-DF. The effectiveness of the design optimization framework is demonstrated by comparing it to a base case solution. Finally, the design calculations are validated via PLECS simulation with manufacturer-provided 3D power semiconductor models that include thermal modelling.

中文翻译：

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多目标分层优化：并网交错 H 桥的设计框架


将功率转换器并联连接到电网以实现功率共享是一种广泛使用的技术。在此背景下，低成本、轻量化、紧凑且高性能的最佳配置的设计框架是一个悬而未决的问题。本文提出了一种创新的多目标分层优化设计框架（MO-HO-DF），用于具有 N 个交错 H 桥的交流电网接口，每个 H 桥具有 M 个并联“待定”开关，通过耦合电感（L f）。设计框架优化总共确定了八个品质因数 (FOM)。提出了电力电子系统的严格模型。接下来，提出了一种计算效率很高的算法，用于估计所需的调频比 (mf )，以满足任何给定配置的电流谐波性能要求。然后，给出了MO-HO-DF算法的概念和实现。通过与基本案例解决方案进行比较，证明了设计优化框架的有效性。最后，通过 PLECS 仿真以及制造商提供的包含热建模的 3D 功率半导体模型来验证设计计算。