Design of a Cable System for a High-Power Density MVDC Aircraft Electric Power System
Design of a Cable System for a High-Power Density MVDC Aircraft Electric Power System
复制标题
高功率密度 MVDC 飞机电力系统电缆系统设计
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Jane Lehr
中科院分区：
文献类型：
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作者：
Arian Azizi;M. Ghassemi;Jane Lehr
未来一代电动飞机（如多电动飞机（MEA）和全电动飞机（AEA））的电力系统（EPS）要求具有高功率输出和低系统质量。由于宽体飞机在巡航高度的对流传热有限，基于IEC 60502等典型标准设计高功率输送和低系统质量电力系统（eps）的电缆面临着典型绝缘系统的热限制等挑战。为了设计低系统质量的电缆系统，应采用铝作为导体，并减小电缆的外径。前者增加了电缆的焦耳损耗，后者减少了辐射和对流传热，两者都会导致电缆的最高允许温度超过。本文设计了飞机用±5kV电缆的多层绝缘系统。设计的多层绝缘系统具有更高的导热性，并含有AlN， PI和PFA等高温材料，以补偿由于电缆外径减小而导致的整体传热减少。与基于IEC 60502标准设计的绝缘系统相比，所设计的多层电缆具有更小的厚度和更低的质量。为了确定设计的绝缘系统中的电场和温度场分布，在COMSOL Multiphysics中进行了耦合研究。本研究的主要目的是将设计的多层电缆系统的外径和质量与基于IEC 60502标准设计的电缆进行比较。此外，得到的电场分布表明，设计的绝缘系统是电气安全的。
Electric power systems (EPS) for the future generation of electrified aircraft such as more electric aircraft (MEA) and all electric aircraft (AEA) are required to be high power delivery and low system mass. Due to the limited heat transfer by convection at the cruising altitude of a wide-body aircraft, designing cables for high power delivery and low system mass electric power systems (EPSs) based on typical standards e.g., IEC 60502 faces challenges such as thermal limits of the typical insulation systems. To design a low system mass cable system, aluminum should be used as the conductor and the overall diameter of the cable should be decreased. The former increases the joule losses of the cable, and the latter reduces heat transfer by radiation and convection, both resulting in exceeding the cable’s maximum permissible temperature. In this paper, a multi-layer insulation system for a ±5kV cable is designed for aircraft applications. The designed multi-layer insulation system experiences higher thermal conductivity and contains high-temperature materials such as AlN, PI, and PFA to compensate for the overall heat transfer reduction caused by decreasing the cable’s overall diameter. The designed multi-layer cable has a smaller thickness and a lower mass compared to insulation systems designed based on IEC 60502 standard. To determine the electric field and temperature field distributions across the designed insulation system a coupled study in COMSOL Multiphysics has been conducted. The main purpose of this study is to compare the designed multi-layer cable system’s overall diameter and mass to the cables designed based on IEC 60502 standard. Moreover, the obtained electric field distribution across the designed insulation shows that the designed insulation system is electrically safe.