Life prediction modeling of bus capacitors in AC variable frequency drives

被引:19
作者
Gasperi, ML [1 ]
机构
[1] Rockwell Automat, Milwaukee, WI 53204 USA
来源
Conference Record of 2005 Annual Pulp and Paper Industry Technical Conference | 2005年
关键词
D O I
10.1109/PAPCON.2005.1502060
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Aluminum electrolytic capacitors are the leading choice for AC Variable Frequency Drive (VFD) bus filters. Predicting the expected life of these components in this application is complicated by four factors. First, the electrical impedance of Aluminum electrolytic capacitors is nonlinear with both frequency and temperature. Second, motor drives produce a spectrally rich ripple current waveform which makes energy loss difficult to compute. Third, the heat transfer characteristic of capacitor banks is dependent on design geometry. Fourth, the expected life of Aluminum electrolytic capacitors is extremely sensitive to operating temperature. This paper describes a method for predicting bus capacitor life that addresses these problems by using a multiple component model for capacitor impedance, a motor drive simulation to create ripple current waveforms, a heat transfer model based on bank geometry, and a capacitor life model derived from the device physics of failure. An example is given showing the effect of AC line impedance on relative expected life.
引用
收藏
页码:141 / 146
页数:6
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