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。
Long power transmission line can lead to voltage pulse wave reflection and exceed electromagnetic compatibility limits for power electronics device and system. For accurate prediction of rectifier＇s electromagnetic interference, the establishment of a cable model is the key to reflect transmission features. The lumped parameter based S. Kim model can not exactly describe inherent high-frequency characteristics of transmission line, considering the influences of frequency parameter variation and skin effect on conductor＇s current distribution density. To achieve accurate parameter identification of the wideband parasitic model, the equivalent circuit based on the ＂N-Branch＂ theory is employed. Thus accurate prediction model and stable convergence are obtained, and this effective approach provides a theoretical basis for EMC research of power rectifier. Finally, calculation and experimental results of conducted interference with the proposed modeling method are almost the same at low frequencies, and there is only about 5 dB estimation deviation at high frequencies, which verifies its feasibility and correctness.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第4期1386-1392,共7页
High Voltage Engineering
基金
国家高技术研究发展计划(863计划)(2013BAG01B00)~~
