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首页> 外文期刊>Circuits and systems >Simulation of Space Charge Impact on Partial Discharge Inception Voltage in Power Busbars Dedicated to Future Hybrid Aircrafts
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Simulation of Space Charge Impact on Partial Discharge Inception Voltage in Power Busbars Dedicated to Future Hybrid Aircrafts

机译：仿真对致力于未来混合动力车电力母线中局部放电初始电压的仿真

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摘要

Reducing greenhouse gases, saving energy resources and mass optimization require technological changes towards increasingly electric vehicles. At the same time, performance improvement of semiconductor and dielectric materials further promotes electronic components confinement, resulting in a significant increase of embedded power densities. In the particular case of future hybrid propulsion aircrafts, electrical power that intended to supply reactors would be converted through power electronics components mounted on power busbars and insulated by solid dielectrics materials. These dielectrics materials have to respond to various electrical constraints of use (HVDC), in spite of environment change of aircraft parameters such as low pressure, temperature and thermal cycles, humidity... Unfortunately, partial discharges phenomenon is the most problem within electrical insulation system (EIS). Based on a topological model of power busbars designed for power converters dedicated to hybrid aircraft, partial discharge studies were conducted by simulation in various charging conditions of a PTFE insulator. Simulation results, which focus on electric field thresholds criteria of partial discharge inception voltage in air, reveal a net sensitivity of a space charge accumulation and distribution on dielectrics behaviour even for low space charge density, depending on their location in dielectrics. Compared to the behaviour observed with implanted homocharges, when by increasing homocharges density from 0.5 C/m~3 to 2 C/m~3 we observe a decrease of electric field by 450%, simulation results show a highest risk of partial discharge inception when heterocharges are accumulated inside dielectrics. Their accumulation increases the electric field in triple points beyond electric field thresholds of partial discharge inception in air. The simulated electric field reaching 22 kV/mm with only 2 C/m~3 of heterocharges density accumulated in dielectric/busbars interfaces.
机译：减少温室气体，节约能源资源和质量优化需要对日益电动汽车进行技术变化。同时，半导体和介电材料的性能改进进一步促进了电子元件限制，导致嵌入功率密度显着增加。在未来的混合推进飞机的特定情况下，打算通过安装在功率母线上的电力电子元件和固体电介质材料绝缘的电力电子元件来转换电力。这些电介质材料必须响应各种电气限制的使用（HVDC），尽管飞机参数的环境变化，如低压，温度和热循环，湿度......不幸的是，部分放电现象是电绝缘中最多的问题系统（EIS）。基于专为致力于混合动力车飞机的电力转换器设计的电力母线拓扑模型，通过PTFE绝缘体的各种充电条件下模拟进行局部放电研究。仿真结果，其专注于空气中局部放电初始电压的电场阈值标准，揭示了介质行为的空间电荷累积和分布的净灵敏度，即使对于低空间电荷密度，取决于它们在电介质中的位置。与用植入的均匀观察到的行为相比，当通过从0.5 c / m〜3至2 c〜3的均匀密度增加时，观察电场的减少450％，模拟结果显示出局部放电初始的最高风险异质充电累积在电介质内。它们的累积增加了三重点中的电场，超出了空气中局部放电终止的电场阈值。模拟电场达到22 kV / mm，仅在电介质/母线接口中累积了2个C / M〜3的异质密度。

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