Increasing the specific power and efficiency of a power converter has been the forever-lasting task for power electronics engineers. With the Wide bandgap (WBG) semiconductor devices, new opportunities and challenges have been found. In this article, a 100-kW SiC grid-connected Photovoltaic (PV) string inverter is proposed. This SiC inverter is free of a grid interface filter, the size, weight, and cost of magnetic components are therefore reduced. In addition, to further achieve high power density high efficiency at 100kW, design aspects including closed-form equation to avoid overdesign passive components, ICT design optimization, and interphase crosstalk mitigation with high switching frequency have been presented. A 100-kW three-phase two-stage prototype has been built in the laboratory, which achieves a specific power of 5 kW/kg, measured peak efficiency of 99.5%, and California Energy Commission (CEC) efficiency of 99.2%.

中文翻译：

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100 kW SiC滤网并网的光伏串式逆变器的单元间变压器（ICT）设计优化和相间串扰缓解

对于电力电子工程师而言，提高功率转换器的比功率和效率一直是永恒的任务。利用宽带隙（WBG）半导体器件，已经发现了新的机遇和挑战。本文提出了一种100 kW SiC并网光伏（PV）串式逆变器。该SiC逆变器没有网格接口滤波器，因此可减少磁性组件的尺寸，重量和成本。此外，为了进一步实现100kW的高功率密度和高效率，已经提出了包括避免无源组件过度设计的闭式方程式，ICT设计优化以及具有高开关频率的相间串扰缓解等设计方面的建议。已在实验室中构建了一个100 kW的三相两阶段原型，其比功率达到5 kW / kg，