地铁牵引供电系统双向变流装置直流短路研究
崔炳涛1梅桂芳1郑月宾1孟向军1牛化鹏2李朋翔1
Research on DC Short Circuit of Bidirectional Converter in Metro Traction Power Supply System
CUI BingtaoMEI GuifangZHENG YuebinMENG XiangjunNIU HuapengLI Pengxiang
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作者信息:1.1. 西安许继电力电子技术有限公司，710075，西安；
2.2. 许继电气股份有限公司，461001，许昌
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Affiliation:Xi′an XJ Power Electronics Technology Co., Ltd., 710075, Xi′an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.09.030
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中图分类号/CLCN:U231.8
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栏目/Col:研究报告
摘要:
采用以双向变流装置为核心的新型牵引供电系统方案，解决目前地铁牵引供电系统存在制动能量无法回收的问题。考虑到供电系统的可靠性，对新型供电系统直流侧的短路故障特性分段进行分析，IGBT（绝缘栅双极晶体管）反并联二极管处于续流或自然整流状态，存在较大的损坏风险。为了保护装置的IGBT反并联二极管，提出采用在功率模块中额外并联低内阻的功率二极管和设置直流侧电抗的方式，降低流过反并联二极管的短路电流。最终，搭建基于实际装置的仿真模型，通过仿真验证了直流短路分析的准确性。
Abstracts:
New traction power supply system scheme with bidirectional converter is adopted for solving the problem of braking energy unable to be recovered in the current system. Considering the reliability of the power supply system, the features of short circuit fault of new system DC side are analyzed segmentally. Great risk of damage exists in IGBT (insulated gate bipolar transistor) anti-parallel diode being in the freewheeling or natural rectification state. To protect the IGBT anti-parallel diode of the device, it is proposed to use additional parallel low-resistance power diodes in the power module and to set the DC side inductance to reduce the short-circuit current flowing through the anti-parallel diode. Finally, a simulation model based on the actual device is built, and the accuracy of the DC short circuit analysis is verified.
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