DC-link capacitance estimation in AC/DC/AC PWM converters using voltage injection

被引：86

作者：

Abo-Khalil, Ahmed G. ^{[1
]}

Lee, Dong-Choon ^{[2
]}

机构：

[1] Assiut Univ, Dept Elect Engn, Assiut 71516, Egypt

[2] Yeungnam Univ, Dept Elect Engn, Gyeongbuk 712749, South Korea

来源：

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS | 2008年 / 44卷 / 05期

基金：

新加坡国家研究基金会;

关键词：

electrolytic capacitors; estimation; pulsewidth-modulation (PWM) converters; support vector regression (SVR); voltage injection;

D O I：

10.1109/TIA.2008.2002181

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, a new online capacitance estimation method for dc-link capacitors in a three-phase ac/dc/ac pulsewidth-modulation converter is proposed. A controlled ac voltage with a lower frequency than the line frequency is injected into the dc-link voltage, which then causes ac power ripples at the dc output side. By extracting the ac power component on the dc output side using digital filters, the capacitance can then be calculated using a support vector regression method. A function that defines the relation between a given capacitor power and its corresponding capacitance is determined using a set of training data. This function is then used to predict the output for the given input which is not included in the training set. The proposed method can be simply implemented with only software and no additional hardware. Experimental results confirm that the estimation error is less than 0.15%.

引用

页码：1631 / 1637

页数：7

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