The more-electric aircraft concept has made the extraction of electrical power from both high-pressure shaft and low-pressure shaft of the aircraft engine essential for future aircraft. With each shaft driving one electrical generation channel, an advanced dual-channel enhanced power generation system can be formed. This article aims to address the power quality issues of this dual-channel power generation system, specifically focusing on the reduction of harmonics on a common dc bus. A simplified model to estimate second carrier harmonic of dc current in two-level converters is developed and reveals the fact that while this second carrier harmonic component magnitude can be determined by modulation index and dc-link current, its phase angle is solely dependent on the angle of carrier signals. Based on the developed model and these key findings, a new harmonic cancellation method is proposed through active power sharing and phase angle shifting of the carrier signals within different power sources. The method has demonstrated high robustness and is effective under different fundamental frequencies and power sharing ratio. Both simulation and experimental results are presented in this article to validate the proposed harmonic model and the enhanced cancellation method.

中文翻译：

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多电飞机中双通道增强型发电中心应用的增强型二次载波谐波消除技术


多电动飞机概念使得从飞机发动机的高压轴和低压轴提取电力对于未来的飞机至关重要。每轴驱动一个发电通道，可形成先进的双通道强化发电系统。本文旨在解决该双通道发电系统的电能质量问题，特别关注减少公共直流母线上的谐波。开发了一种用于估计双电平转换器中直流电流二次载波谐波的简化模型，并揭示了这样一个事实：虽然二次载波谐波分量幅度可以通过调制指数和直流母线电流确定，但其相位角仅取决于载波信号的角度。基于开发的模型和这些关键发现，通过不同电源内的载波信号的有源功率共享和相角偏移，提出了一种新的谐波消除方法。该方法具有较高的鲁棒性，并且在不同基频和功率分配比下均有效。本文提供了仿真和实验结果，以验证所提出的谐波模型和增强的消除方法。