In more-electric aircraft (MEA), the synchronous generators are connected directly to the turbo engine to develop a constant-voltage variable-frequency (CVVF) ac supply bus. In addition, the MEA has adopted a high-voltage dc bus in its power system to cater to the various categories of load used by aircraft. Therefore, this change in power paradigm has created a requirement for ac–dc power factor correction (PFC) converters to convert CVVF ac to constant dc with high power quality in a reliable manner. In this article, a three-phase interleaved buck–boost-derived PFC converter is operated in discontinuous current conduction mode to realize the inherent unity power factor (UPF) operation for MEA wide range of supply frequency. The benefits of the proposed converter are higher power density, efficiency, and reliability. The advantages of the proposed converter are demonstrated by performing an analytical comparison with the single-cell three-phase buck–boost derived PFC converter and presented the relevant results. The experimental results from a 2.0-kW laboratory concept-proof hardware prototype have been provided to confirm the proposed converter UPF operation for a wide range of supply frequencies. A low input power factor of 0.9996 and a minimum current THD of 2.52% are recorded from the developed prototype.

中文翻译：

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用于MEA的交错式DCM降压-升压衍生三相PFC转换器的分析与设计

在多电飞机 (MEA) 中，同步发电机直接连接到涡轮发动机以开发恒压变频 (CVVF) 交流电源总线。此外，MEA在其电力系统中采用了高压直流母线，以满足飞机使用的各类负载。因此，电源范式的这种变化要求使用交流-直流功率因数校正 (PFC) 转换器以可靠的方式将 CVVF 交流转换为具有高电能质量的恒定直流。在本文中，三相交错降压-升压衍生 PFC 转换器在不连续电流传导模式下运行，以实现 MEA 宽电源频率范围的固有单位功率因数 (UPF) 运行。所提出的转换器的好处是更高的功率密度、效率和可靠性。通过与单电池三相降压-升压派生 PFC 转换器进行分析比较，证明了所提出转换器的优点，并提供了相关结果。已经提供了来自 2.0 kW 实验室概念验证硬件原型的实验结果，以确认建议的转换器 UPF 在广泛的电源频率范围内运行。开发的原型记录了 0.9996 的低输入功率因数和 2.52% 的最小电流 THD。