基于非对称规则采样策略的变换器传导干扰预测  

Prediction of Conducted Interference in Converter System Based on Asymmetric Regular Sampling Modulation

作　　者：魏克新[1] 梁斌[1] 岳有军[2] 

机构地区：[1]天津大学电气与自动化工程学院,天津市南开区300072 [2]天津市复杂工业系统控制理论及应用重点实验室(天津理工大学),天津市西青区300384

出　　处：《电网技术》2011年第6期208-212,共5页Power System Technology

基　　金：国家自然科学基金项目(50977063);天津市科技支撑计划重点项目(09ZCKFGX01800)~~

摘　　要：提出了非对称规则采样策略下的变换器差模和共模干扰源预测模型,使用频域计算的方法推导了2种干扰源的频谱;总结了差模、共模干扰在变换器开关频率及其倍数频率附近的分布规律,从而对比研究了不同调制比下2种干扰的变化关系,得到了相应的变化规律。在此基础上,利用Saber软件对一个三相整流器系统的传导干扰进行了时域仿真和频域验证,仿真试验验证了理论预测的正确性。该方法可有效推广到逆变器干扰源的分析预测中。Models to predict common mode（CM） and differential mode（DM） interference source of pulse width modulation？（PWM） converter with asymmetric regular sampling modulationis are presented,and a direct calculation method in frequency domain is proposed to deduce frequency spectrums of DM and CM interference sources.The distribution regularities of DM and CM interferences around the switching frequency of converter and its multiple frequencies are summarized,and a comparative research on the variation relation of the two kinds of interferences under different modulation ratios is performed and corresponding variation law is attained.On this basis the time-domain simulation of the conducted electromagnetic interference（EMI） of a three-phase rectifier system is carried out by Saber software and Fourier analysis is applied to simulation results to observe and analyse the amplitudes of interferences at different frequencies to verify the correctness of the analysis results of proposed predictive model using the frequency domain theory.The correctness of theoretical prediction is validated by simulation test,thus the given modeling method could be extended to the analysis and prediction of interference source of three-phase PWM inverter.

关 键 词：非对称规则采样 共模 差模 噪声源 频域分析 

分 类 号：TM46[电气工程—电器]