On-line estimation of aluminum electrolytic-capacitor parameters using a modified Prony's method

Khaled Laadjal, M. Sahraoui, A. Cardoso, Acácio M. R. Amarai
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引用次数: 8

Abstract

Aluminum electrolytic capacitors (AECs) are the most common capacitors used in power electronics. They are frequently used for filtering and storage functions because of their small size, large capacitance and low price. However, AECs also represent the major cause for power electronics equipment breakdown, mainly due to their wear out through the vaporization of the electrolyte, as a result of both aging and temperature effects. The aging of AECs is expressed by the increase of their equivalent series resistance (ESR) and the decrease of their capacitance (C). Therefore, estimating these two parameters can provide a good indicator for a potential capacitor failure. Additionally, these changes in C and ESR parameters strongly influence the ratio between the capacitors voltage ripple and their current ripple. This ratio is dominated by C at low frequencies and by the ESR in the high frequency range. Hence, this paper suggests a method for on-line estimating and tracking of both C and ESR using that ratio, which is computed starting from some always existing harmonics at low and high frequencies. The proposed method uses the Short Time Least Square Prony's (STLSP) technique to determine and track the amplitudes of the target harmonics. The STLSP technique is well suited for such application, since it has the ability to determine and track the amplitude and frequency of any spectral component, even for noisy and non-stationary signals, using a small number of data samples. This reduces a lot the calculation time and the storage requirements. Consequently, the proposed method is appropriate for online implementation. The method's effectiveness is proved by simulation and experimental tests using a boost DC-DC converter.
用改进的proony方法在线估计铝电解电容器参数
铝电解电容器(aec)是电力电子器件中最常用的电容器。由于其体积小、电容大、价格低廉等优点,常用于滤波和存储功能。然而,aec也是电力电子设备故障的主要原因,主要是由于老化和温度效应导致的电解液汽化导致的磨损。aec的老化表现为等效串联电阻(ESR)的增加和电容(C)的减少,因此,估算这两个参数可以为电容器潜在的故障提供一个很好的指标。此外,这些C和ESR参数的变化强烈影响电容器电压纹波和电流纹波之间的比率。该比值在低频由C决定,在高频由ESR决定。因此,本文提出了一种利用该比值在线估计和跟踪C和ESR的方法,该比值从一些始终存在的低频和高频谐波开始计算。该方法采用短时最小二乘法(STLSP)技术来确定和跟踪目标谐波的幅值。STLSP技术非常适合这样的应用,因为它有能力确定和跟踪任何频谱成分的幅度和频率,即使是噪声和非平稳信号,使用少量的数据样本。这大大减少了计算时间和存储需求。因此,所提出的方法适合在线实现。通过升压DC-DC变换器的仿真和实验验证了该方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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