电工技术学报  2023, Vol. 38 Issue (8): 2086-2099    DOI: 10.19595/j.cnki.1000-6753.tces.220871
电力电子 |
分立器件并联型叠层母排均流分析及优化设计
於少林1, 张兴1, 王佳宁1,2, 周伟男1, 黄耀东1
1.可再生能源接入电网技术国家地方联合工程实验室(合肥工业大学) 合肥 230009;
2.合肥综合性国家科学中心能源研究院 合肥 230088
The Current Balance Analysis and Optimization Design of the Laminated Busbar with Discrete Devices in Parallel
Yu Shaolin1, Zhang Xing1, Wang Jianing1,2, Zhou Weinan1, Huang Yaodong1
1. National and local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology Hefei University of Technology Hefei 230009 China;
2. Institute of Energy Hefei Comprehensive National Science Center Hefei 230088 China
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摘要 并联应用SiC MOSFET是一种适应大功率变流场景的有效方案,但是容易出现器件电流不均衡现象。该文根据一款分立器件并联型逆变器出现的静态不均流问题,在建立的寄生参数模型基础上分析寄生参数差异性对于并联均流的影响,指出影响静态均流的关键因素。同时分析交流母排汇流点位置对于静态寄生参数的影响,提出一种定位真实汇流点的方法,从而可以准确提取静态寄生参数。最后探究路径间的耦合效应对于等效寄生电感的影响,通过调整交流母排汇流点匹配路径的自感和互感,实现等效寄生参数的均衡性。基于此,对该叠层母排进行优化设计,最终的实验结果表明,优化后的叠层母排极大地改善了静态均流,验证了该优化设计方案的有 效性。
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於少林
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黄耀东
关键词 分立器件并联型叠层母排寄生参数    
Abstract:To accommodate high-power power conversion application scenarios, the SiC MOSFETs must be used in parallel. In medium and high-power inverters, the laminated busbar with low parasitic inductance characteristics is usually used as an interconnection structure for DC-link capacitors and power devices. An asymmetrical laminated busbar structure can lead to asymmetrical parasitic parameters, which in turn causes unbalanced current distribution among the parallel devices. Therefore, in addition to the low parasitic inductance, the symmetry of the parasitic parameter for each parallel branch is a critical design factor for the laminated busbar with discrete devices in parallel. This paper analyzed the current sharing performance of the laminated busbar with six discrete devices in parallel and further optimized the busbar structure.
Firstly, the equivalent parasitic parameters of each parallel branch of the original laminated busbar are extracted by the established parasitic parameter model. The results show that the equivalent parasitic inductance and parasitic resistance of each parallel branch are unbalanced in the static process. The effect of the unbalanced parasitic parameters on the current distribution among the paralleled devices is analyzed by the established double-pulse simulation circuit. It is shown that reducing the switching speed can weaken the effect of the parasitic inductance variability on the dynamic current imbalance. In the context of large-load applications, it is necessary to pay more attention to the effect of parasitic resistance differences on the static current imbalance.
Then, aiming at the extraction accuracy of the static parasitic parameters for the laminated busbar with discrete devices in parallel, this paper proposes a sink location method. It points out that the current sink should be the maximum point of the aggregated current, while the impedance after the point does not affect the current distribution. Based on this principle, the real sink point in the AC busbar is located in combination with the finite simulation software, which improves the extraction accuracy of static parasitic parameters. In addition, the mutual coupling effect on the parasitic parameters of the laminated busbar is explored. It is found that the presence of coupled mutual inductance will make it possible for the equivalent parasitic parameters of asymmetric parallel branches to be consistent. The original laminated busbar with six discrete devices in parallel is then optimized. By adjusting the position of the current sink point, thus matching the self-inductance and mutual inductance, the parasitic parameters of the parallel branch can be equalized. The parasitic parameters of the optimized laminated bus are extracted, and the results show that the parasitic parameters of each parallel branch are more balanced in the static process.
Finally, a double-pulse test platform was built to test the static currents of each parallel device of the optimized laminated busbar. Compared with the original laminated busbar, the experimental results show that the static unbalanced current has been greatly improved.
Key wordsDiscrete devices    parallel connection    the laminated busbar    parasitic parameters   
收稿日期: 2022-05-19     
PACS: TM46  
基金资助:国家自然科学基金面上项目(52077051)、合肥综合性国家科学中心能源研究院重点培育项目(21KZS203)和高等学校创新引智计划项目(BP0719039)资助
通讯作者: 王佳宁 男,1985年生,博士,副教授,研究方向为新一代功率器件封装、测试、集成、运用等。E-mail: jianingwang@hfut.edu.cn   
作者简介: 於少林 男, 1992年生,博士研究生,研究方向为新型功率器件封装与应用、电力电子集成与电磁分析。E-mail: hajcysl@163.com
引用本文:   
於少林, 张兴, 王佳宁, 周伟男, 黄耀东. 分立器件并联型叠层母排均流分析及优化设计[J]. 电工技术学报, 2023, 38(8): 2086-2099. Yu Shaolin, Zhang Xing, Wang Jianing, Zhou Weinan, Huang Yaodong. The Current Balance Analysis and Optimization Design of the Laminated Busbar with Discrete Devices in Parallel. Transactions of China Electrotechnical Society, 2023, 38(8): 2086-2099.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.220871          https://dgjsxb.ces-transaction.com/CN/Y2023/V38/I8/2086