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基于载波脉宽调制技术的牵引整流器谐波特性分析方法

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Keywords: 载波脉宽调制技术,单相整流器,正弦切割模型,死区,附加谐波

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Abstract:

为研究高速铁路谐波负荷形成的机理及影响因素,基于简化的正弦切割模型,解释了基于载波脉宽调制技术(CBPWM)的工作机理;结合经典双边傅里叶级数与贝塞尔函数,推导出高速列车牵引传动系统CBPWM单相整流器H桥交流电压的谐波频谱计算公式。进一步分析死区对正弦切割模型的影响,建立起考虑死区的统一正弦切割模型。在此基础上,推导出死区附加谐波频谱理论计算公式,量化分析了死区对基波与谐波含量的影响。以某高速列车牵引传动系统为例,分别基于纯数字仿真与硬件半实物实验验证了统一正弦切割模型的精确性与正确性。

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