Thermal Performances and Annual Damages Comparison of MMC Using Reverse Conducting IGBT and Conventional IGBT Module
Thermal Performances and Annual Damages Comparison of MMC Using Reverse Conducting IGBT and Conventional IGBT Module
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DOI：
10.1109/tpel.2021.3062620
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发表时间：
2021-09-01
影响因子：
6.7
通讯作者：
Tatsuhiko, Fujihira
中科院分区：
文献类型：
--
作者：
Wang, Binyu;Wang, Laili;Tatsuhiko, Fujihira
模块化多电平变流器中的绝缘栅双极晶体管（IGBT）模块存在着固有的功率损耗分布不平衡和温度波动问题。某些芯片可能成为热点，并且具有比其他芯片大得多的温度摆幅，这严重影响了IGBT模块的寿命。因此，有效的低成本改进措施对于MMC中的IGBT模块至关重要。反向导通IGBT（RC-IGBT）将IGBT和续流二极管集成在同一芯片上，具有热阻低、开关损耗小、热容大等优点。在本文中，新一代RC-IGBT模块和传统的IGBT（Con-IGBT）模块从富士电机具有相同的封装都用于MMC。提出了一种新的RC-IGBT和Con-IGBT模块电流密度定义。在相同的组件电流密度下，综合比较了两种组件在不同功率因数下的热性能和年损伤情况。结果表明，当功率因数大于0.4时，使用RC-IGBT可以显著改善MMC子模块的热性能，延长其使用寿命。此外，本文还对产生这种比较结果的原因进行了讨论.最后通过实验验证了RC-IGBT在热性能方面的优势。本文也为MMC SM的设计提供了指导。
Insulated gate bipolar transistor (IGBT) modules in modular multilevel converters (MMCs) have inherent unbalanced power loss distribution and temperature swing. Some chips may become the hotspots and have much larger temperature swing than others, which seriously compromises the lifetime of the IGBT modules. Therefore, effective improvement measures that are low cost become crucial for the IGBT modules in MMC. Reverse conducting IGBT (RC-IGBT) constructs the IGBT and freewheel diode in a single chip, which has the advantages of lower thermal resistance, lower switching loss, and larger heat capacity. In this article, a new generation of RC-IGBT module and conventional IGBT (Con-IGBT) module from Fuji Electric with the same packaging are both used in the MMC. A newly defined current density for RC-IGBT and Con-IGBT module is proposed. The thermal performances and annual damages of the two modules under different power factors are comprehensively compared at the same module current density. The results show that when the power factor is greater than 0.4, using RC-IGBT can significantly improve the thermal performance of MMC submodules (SMs) and extend their lifetime. In addition, the reasons for the comparison results are also discussed in this article. Finally, the advantages of RC-IGBT in terms of thermal performances are verified by experiment. This article also provides a guideline for the design of MMC SMs.