Electromagnetic interference filter design based on terminal model of inverter

doi:10.3785/j.issn.1008-973X.2021.11.023

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (11): 2215-2224 DOI: 10.3785/j.issn.1008-973X.2021.11.023

Electromagnetic interference filter design based on terminal model of inverter

Tian-xiang ZHOU(

),Xiao-yan ZHENG,Shi-ze YE,Heng-lin CHEN*(

)

College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

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Abstract

The noise source impedance of inverter has a great influence on the filtering effect of electromagnetic interference (EMI) filter, and it is necessary to extract and analyze the noise source impedance of inverter when designing the filter. A passive EMI filter design method based on terminal model of inverter was studied. A terminal EMI model of inverter was established. By measuring terminal voltage as well as terminal current of inverter and using optimized algorithm, the equivalent noise source and the equivalent source impedance of inverter were extracted. Considering the noise source impedance, the load impedance and the high-frequency characteristics of filter components, optimization algorithm was used to calculate the component parameters of filter, so as to realize the quantitative design of EMI filter. For the problem that common-mode EMI at some frequency points exceeded limit after connecting the filter, the cause of resonance was analyzed, and a damping circuit design method was proposed. Connecting the designed EMI filter for experiment, EMI of the inverter output lines met the standard, which validated the proposed EMI filter design method.

Key words： inverter electromagnetic interference (EMI) noise source impedance EMI filter design resonance suppression

Received: 15 March 2021 Published: 05 November 2021

CLC:

TM 464

Fund: 国家重点研发计划资助项目（2018YFB1500700）

Corresponding Authors: Heng-lin CHEN E-mail: zhoutianxiang@zju.edu.cn;henglin@zju.edu.cn

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Cite this article:

Tian-xiang ZHOU,Xiao-yan ZHENG,Shi-ze YE,Heng-lin CHEN. Electromagnetic interference filter design based on terminal model of inverter. Journal of ZheJiang University (Engineering Science), 2021, 55(11): 2215-2224.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.11.023 OR https://www.zjujournals.com/eng/Y2021/V55/I11/2215

基于逆变器端口模型的电磁干扰滤波器设计

逆变器的噪声源阻抗对电磁干扰（EMI）滤波器的滤波效果有较大影响，在设计滤波器时有必要对逆变器的噪声源阻抗进行提取和分析，研究基于逆变器端口模型的无源EMI滤波器设计方法. 建立逆变器的端口电磁干扰等效模型，通过测试逆变器的端口电压和端口电流，采用优化算法提取逆变器的等效噪声源和等效源阻抗. 在考虑噪声源阻抗、负载阻抗以及滤波元件高频特性的情况下，采用优化算法计算滤波元件参数，实现EMI滤波器的量化设计. 针对接入滤波器后部分频点共模干扰超标的问题，分析发生谐振的原因，提出阻尼电路的设计方法. 接入所设计的EMI滤波器进行实验，逆变器输出线的电磁干扰符合标准，验证了所提出的EMI滤波器设计方法.

关键词： 逆变器, 电磁干扰（EMI）, 噪声源阻抗, EMI滤波器设计, 谐振抑制

Fig.1 Photovoltaic micro inverter system

Fig.2 Terminal EMI model of inverter

Tab.1 Component parameters and connection mode of insertion impedances

Fig.3 Amplitude-frequency curve of equivalent noise sources

Fig.4 Amplitude-frequency curve of equivalent noise source impedances

Fig.5 Comparison of measured and calculated terminal voltage U_LG

Fig.6 Comparison of measured and calculated terminal voltage U_NG

Fig.7 Terminal DM EMI / CM EMI model of inverter

Fig.8 Comparison of terminal DM voltage and CM voltage with conducted EMI limit

Fig.9 Required DM insertion loss and CM insertion loss of inverter

Fig.10 Terminal DM EMI model after connecting π-shaped DM filter

Tab.2 Component parameters of π-shaped DM filter obtained by simulation

Fig.11 DM EMI after connecting π-shaped DM filter

Fig.12 Terminal CM EMI model after connecting π-shaped CM filter

Fig.13 Terminal CM EMI model after connecting two-stage π-shaped CM filter

Tab.3 Component parameters of two-stage π-shaped CM filter obtained by simulation

Tab.4 Component parameters of two-stage π-shaped CM filter actually selected

Fig.14 CM EMI after connecting two-stage π-shaped CM filter

Fig.15 High-frequency equivalent model of two-stage π-shaped CM filter

Fig.16 CM EMI after adding different damping resistors

Fig.17 Connection diagram of EMI filter

Fig.18 EMI of L-line and N-line after connecting filter


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