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高功率密度中高频变压器绝缘与散热研究进展与展望

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围绕大容量电力电子变压器的发展需求,针对其中关键部件"高功率密度中高频变压器"的绝缘与散热研究进行综述分析.高功率密度对固体绝缘与散热性能提出新的挑战.首先,论述了高功率密度中高频变压器设计与应用时绝缘和散热的矛盾.其次,主要论述了高频绝缘失效的研究进展,包括绝缘击穿、局部放电、沿面放电、电树枝劣化等特性.然后,分析了目前高频绝缘的失效机理研究,包括热击穿、空间电荷效应、高频电导与自由体积效应.最后,论述了高频绝缘寿命的研究,分析了频率、温度、电压变化率 du/dt 等对绝缘耐电晕寿命的影响以及寿命模型.基于研究进展,提出了高频绝缘与散热的研究展望.该文综述研究对大容量电力电子变压器的设计与应用具有重要意义.
Research Progress and Technical Prospect in Insulation and Heat Dissipation of High Power Density Medium-high Frequency Transformer
We review and analyze the insulation and heat dissipation research of the key component high power density medium-high frequency transformer in response to the development needs of large capacity power electronic transformers.High power density presents new challenges to the solid insulation and heat dissipation performance.Firstly,the contra-diction between insulation and heat dissipation during the design and application of high power density medium-high-frequency transformers is discussed.Secondly,the research progress of high-frequency insulation failure is mainly discussed,including characteristics such as insulation breakdown,partial discharge,surface discharge,and elec-trical tree deterioration.Then,the current research on the failure mechanism of high-frequency insulation is analyzed,including thermal breakdown,space charge effect,high-frequency conductance,and free volume effect.Finally,the re-search on the life of high-frequency insulation is discussed,and the influences of frequency,temperature,voltage change rate du/dt,etc.on the corona-resistant insulation life and the life model are analyzed.Based on the research advancements,the research prospects of high-frequency insulation and heat dissipation are proposed.The review research in this article is of great importance to the design and application of large-capacity power electronic transformers.

medium-high frequency transformerinsulationheat dissipationbreakdownpartial dischargespace chargeinsulation lifespan

王威望、罗宇靖、关子凌、李盛涛、杨伟鸿、傅明利

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电工材料电气绝缘全国重点实验室(西安交通大学),西安 710049

南方电网科学研究院有限责任公司,广州 510080

中高频变压器 绝缘 散热 击穿 局部放电 空间电荷 绝缘寿命

国家自然科学基金面上项目南方电网科学研究院有限责任公司科技项目南方电网科学研究院有限责任公司科技项目

521770251500002022030103GY000691500002023030103GY00309

2024

10.13336/j.1003-6520.hve.20240777

高电压技术
中国电力科学研究院　中国电机工程学会

高电压技术

CSTPCD北大核心
影响因子：2.32
ISSN：1003-6520
年,卷(期)：2024.50(10)