基于高频电力线模型的整流器传导干扰分析与验证

发布时间：2018-09-07 09:19

【摘要】：电力传输线是引起电力电子装置或系统发生电压反射以及无法满足电磁兼容限值的主要原因,为了实现整流系统电磁干扰估算,构建能够精确反映电磁传输特性的电缆模型是关键环节之一。高频时参数的频率变化及集肤效应引起的分布特性差异对导体电流分布密度产生影响,此时计及集总参数的S.Kim模型无法精确表征传输线固有特性。为实现模型宽频带寄生参数准确辨识,故采用基于"N-Branch"理论的传输线等效电路拟合策略,从而实现预测模型精确逼近和稳定收敛,为功率整流器系统的EMC设计提供有效的理论依据。最后,通过数值计算和实验结果对上述建模机理可行性与准确性进行验证,在低频段传导干扰实测值与预测结果几乎一致,而在高频段仅仅产生约5 d B的估算误差,预测趋势基本符合。
[Abstract]:Power transmission line is the main cause of voltage reflection in power electronic device or system and the limit value of electromagnetic compatibility can not be satisfied. In order to realize the estimation of electromagnetic interference in rectifier system, It is one of the key links to construct cable model which can accurately reflect electromagnetic transmission characteristics. At high frequency, the frequency change of parameters and the difference of distribution characteristics caused by skin effect have an effect on the current distribution density of conductors. At this time, the S.Kim model with lumped parameters can not accurately characterize the inherent characteristics of transmission lines. In order to accurately identify the parasitic parameters of the model in wide band, the equivalent circuit fitting strategy based on "N-Branch" theory is adopted to realize the accurate approximation and stable convergence of the prediction model. It provides an effective theoretical basis for the EMC design of power rectifier system. Finally, the feasibility and accuracy of the above modeling mechanism are verified by numerical calculation and experimental results. The measured results of conduction interference in low frequency band are almost consistent with the predicted results, but only about 5 dB estimation errors are produced in high frequency band. The forecast trend is basically consistent.
【作者单位】：天津农学院工程技术学院;北京新能源汽车股份有限公司;天津大学电气与自动化工程学院;
【基金】：国家高技术研究发展计划(863计划)(2013BAG01B00)~~
【分类号】：TM461

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