A Capacitance Estimation of Film Capacitors in an LCL-Filter of Grid-Connected PWM Converters

Hong-Jun Heo; Won-Sang Im; Jang-Sik Kim; Jang-Mok Kim

A Capacitance Estimation of Film Capacitors in an LCL-Filter of Grid-Connected PWM Converters

Vol. 13, No. 1, pp. 94-103, Jan. 2013

10.6113/JPE.2013.13.1.94

Deterioration of film capacitor

Grid connected PWM converter

Injection of resonant frequency

LCL filter

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Abstract

A capacitor deterioration of LCL-filter grid-connected PWM converters is progressed by the self-healing mechanism. It leads to the degradation of the filter performance and drop of power factor. Thus, it is required to diagnose fault-point of capacitors and determine the replacement time. Typically, the fault of capacitors is determined when the capacitance is reduced up to 80% from initial value. This paper proposes algorithm to the determine capacitor replacement time of an LCL filter. The algorithm takes the advantage of change of the response on the injected resonant frequency corresponding to 80% value from the initial capacitance. The results of the algorithm are demonstrated through simulations and experiments.

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Cite this article

[IEEE Style]

H. Heo, W. Im, J. Kim, J. Kim, "A Capacitance Estimation of Film Capacitors in an LCL-Filter of Grid-Connected PWM Converters," Journal of Power Electronics, vol. 13, no. 1, pp. 94-103, 2013. DOI: 10.6113/JPE.2013.13.1.94.

[ACM Style]

Hong-Jun Heo, Won-Sang Im, Jang-Sik Kim, and Jang-Mok Kim. 2013. A Capacitance Estimation of Film Capacitors in an LCL-Filter of Grid-Connected PWM Converters. Journal of Power Electronics, 13, 1, (2013), 94-103. DOI: 10.6113/JPE.2013.13.1.94.