Mitigation of Low Frequency AC Ripple in Single-Phase Photovoltaic Power Conditioning Systems

Sang-Hoey Lee; Tae-Pung An; Hanju Cha

Mitigation of Low Frequency AC Ripple in Single-Phase Photovoltaic Power Conditioning Systems

Sang-Hoey Lee

Tae-Pung An

Hanju Cha

Vol. 10, No. 3, pp. 328-333, May 2010

10.6113/JPE.2010.10.3.328

Automatic voltage regulation

Current based maximum power point tracking

DC/DC converter

Feed-forward ripple

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Abstract

A photovoltaic power conditioning system (PV PCS) that contains single–phase dc/ac inverters tends to draw an ac ripple current at twice the output frequency. Such a ripple current perturbs the operating points of solar cells continuously and it may reduce the efficiency of the current based maximum power point tracking technique (CMPPT). In this paper, the ripple current generation in a dc link and boost inductor is analyzed using the ac equivalent circuit of a dc/dc boost converter. A new feed-forward ripple current compensation method to incorporate a current control loop into a dc/dc converter for ripple reduction is proposed. The proposed feed-forward compensation method is verified by simulation and experimental results. These results show a 41.8 % reduction in the peak-to peak ac ripple. In addition, the dc/ac inverter control system uses an automatic voltage regulation (AVR) function to mitigate the ac ripple voltage effect in the dc link. A 3kW PV PCS prototype has been built and its experimental results are given to verify the effectiveness of the proposed method.

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Cite this article

[IEEE Style]

S. Lee, T. An, H. Cha, "Mitigation of Low Frequency AC Ripple in Single-Phase Photovoltaic Power Conditioning Systems," Journal of Power Electronics, vol. 10, no. 3, pp. 328-333, 2010. DOI: 10.6113/JPE.2010.10.3.328.

[ACM Style]

Sang-Hoey Lee, Tae-Pung An, and Hanju Cha. 2010. Mitigation of Low Frequency AC Ripple in Single-Phase Photovoltaic Power Conditioning Systems. Journal of Power Electronics, 10, 3, (2010), 328-333. DOI: 10.6113/JPE.2010.10.3.328.