牵引级联变流器低次谐波分析与抑制策略优化  

Low-order harmonic analysis and suppression strategy optimization of cascaded converters for train traction

作　　者：李向超 冯继营[3] 李正辉 LI Xiangchao;FENG Jiying;LI Zhenghui(Henan Engineering Research Center of Rail Transit Intelligent Security,Zhengzhou,Henan 451460,China;Zhengzhou Railway Vocational and Technical College,Zhengzhou,Henan 451460,China;Henan Mechanical&Electrical Vocational College,Zhengzhou,Henan 450052,China)

机构地区：[1]河南省轨道交通智能安全工程技术研究中心,河南郑州451460 [2]郑州铁路职业技术学院,河南郑州451460 [3]河南机电职业学院,河南郑州450052

出　　处：《机车电传动》2024年第2期92-100,共9页Electric Drive for Locomotives

基　　金：国家自然科学基金项目(62003313);河南省教改重点项目(﹝2024﹞05754)。

摘　　要：以级联H桥变流器为前级拓扑的电力电子变压器是未来列车牵引的重要发展方向,降低牵引级联变流器的低次谐波对提高电力电子变压器的控制性能具有重要意义。然而,引起级联H桥变流器低次谐波的影响因素与常规四象限变流器存在差异,其机理分析和抑制策略尚未得到深入研究。对此,文章详细探究了电力牵引网侧级联H桥变流器低次电流谐波产生机理,揭示了除直流电压波动、器件死区和管压降外,其低次谐波还与H桥级联的模块数及拓扑结构有关。在此基础上,设计一种兼顾直流电压波动和电路拓扑特性的低次谐波抑制算法。同时,结合功率器件的死区效应与管压降影响,提出级联H桥变流器低次电流谐波综合抑制策略。最后,搭建小功率试验平台进行测试,试验结果验证了理论分析的正确性和优化抑制方案的有效性。Power electronic transformers(PET)incorporating cascaded H-bridge(CHB)converters as the front-stage topology represent an important development trend for future train traction.Minimizing low-order harmonics in CHB converters holds immense importance in enhancing the control performance of PETs.However,the factors affecting low-order harmonics in CHB converters differ from those in conventional four-quadrant converters.There is still a lack of detailed research on the underlying mechanisms and suppression strategies.This paper delved into the generation mechanisms of low-order harmonics in CHB converters on the traction network side,highlighting that low-order harmonics were related to the module count and topology of H-bridge cascades,in addition to DC voltage fluctuations,device dead-zones and switching voltage drops.According to the findings,a low-order harmonic suppression algorithm was designed,taking into account DC voltage fluctuations and circuit topology characteristics.Furthermore,a comprehensive optimization strategy for suppressing low-order current harmonics in CHB converters was suggested,integrating the dead zone effects and voltage drop impacts.In the final section,an experiment using a low-power experimental platform was detailed.The experimental results verify the accuracy of the theoretical analysis and the effectiveness of the optimized suppression solution.

关 键 词：牵引级联H桥变流器 低次谐波分析 谐波抑制策略 直流电压波动 器件死区 开关管压降 

分 类 号：TM461[电气工程—电器]