大容量交流叠加直流电源,用于对直流链路电容器的降解评估
Guohao Zhang1, Hua Li1, Haobo Li1
1School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
The Review of scientific instruments
|December 11, 2023
概括
一种新型的高容量电源模拟了DC-link电容器的工作电压,并叠加了波. 这使得关键的衰老研究成为可能,揭示了不同AC/DC比率下的温度上升和降解.
科学领域:
- 电气工程 电气工程
- 材料科学 材料科学 材料科学
- 电力电子 电力电子 电力电子
背景情况:
- 直流链电容器在功率转换器中至关重要,经历复杂,不规则的电压波形.
- 准确模拟这些工作电压对于可靠的电容器衰老研究至关重要.
- 现有的设备可能无法充分复制叠加的直流和波电压配置文件.
研究的目的:
- 设计和实施一个大容量的DC/AC叠加实验电源.
- 在现实的操作条件下调查直流链电容器的降解特性.
- 分析不同交流/直流电压比对电容温度升高和老化的影响.
主要方法:
- 开发了100kVA电源,包括交流,直流,保护和隔离模块.
- 利用快里叶变换 (FFT) 分析来表示不规则的波形为直流加波.
- 用于电压生成的隔热门双极晶体管 (IGBT) 逆变器,具有正弦脉冲宽度调制 (SPWM).
- 实现了振幅和相位控制,用于对 kV 级输出进行波分解和串行逆变器配置.
主要成果:
- 设计的电源成功产生了与电容器工作条件非常相匹配的输出电压.
- 进行了降解实验,提供了模拟应力下电容器性能数据.
- 观察到AC/DC比率与电容器温度升高和老化模式之间的相关性.
结论:
- 开发的实验电源对于对直流链路电容器的研究有效.
- 在叠加的交流/直流电压下了解电容器的行为对于转换器的可靠性至关重要.
- 该研究为优化电容器选择和操作参数提供了宝贵的见解.
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