Identification of DC-Link Capacitance for Single-Phase AC/DC PWM Converters

Xing-Si Pu; Thanh Hai Nguyen; Dong-Choon Lee; Suk-Gyu Lee

Identification of DC-Link Capacitance for Single-Phase AC/DC PWM Converters

Vol. 10, No. 3, pp. 270-276, May 2010

10.6113/JPE.2010.10.3.270

Capacitance estimation

Digital filter

PR-controller

PWM converters

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Abstract

In this paper, a capacitance estimation scheme for DC-link capacitors for single-phase AC/DC PWM converters is proposed. Under the no-load condition, a controlled AC current (30[Hz]) is injected into the input side, which then causes AC voltage ripples at the DC output side. Or, a controlled AC voltage can be directly injected into the DC output side. By extracting the AC voltage/current and power components on the DC output side using digital filters, the capacitance value can be calculated, where the recursive least squares (RLS) algorithm is used. The proposed methods can be simply implemented with software only and additional hardware is not required. From the experiment results, a high accuracy estimation of capacitances less than 0.85% has been obtained.

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Cite this article

[IEEE Style]

X. Pu, T. H. Nguyen, D. Lee, S. Lee, "Identification of DC-Link Capacitance for Single-Phase AC/DC PWM Converters," Journal of Power Electronics, vol. 10, no. 3, pp. 270-276, 2010. DOI: 10.6113/JPE.2010.10.3.270.

[ACM Style]

Xing-Si Pu, Thanh Hai Nguyen, Dong-Choon Lee, and Suk-Gyu Lee. 2010. Identification of DC-Link Capacitance for Single-Phase AC/DC PWM Converters. Journal of Power Electronics, 10, 3, (2010), 270-276. DOI: 10.6113/JPE.2010.10.3.270.