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http://dx.doi.org/10.5370/JEET.2014.9.6.1988

A Second-order Harmonic Current Reduction with a Fast Dynamic Response for a Two-stage Single-phase Grid-connected Inverter  

Jung, Hong-Ju (Dept. of Electrical and Biomedical Engineering, Hanyang University)
Kim, Rae-Young (Dept. of Electrical and Biomedical Engineering, Hanyang University)
Publication Information
Journal of Electrical Engineering and Technology / v.9, no.6, 2014 , pp. 1988-1994 More about this Journal
Abstract
In a single-phase grid-connected power system consisting of a DC/DC converter and a DC/AC converter, the current drawn from renewable energy sources has a tendency to be pulsated and contains second-order frequency ripple components, which results in several drawback such as a power harvesting loss and a shortening of the energy source's life. This paper presents a new second-order harmonic current reduction scheme with a fast dc-link voltage loop for two-stage dc-dc-ac grid connected systems. In the frequency domain, an adequate control design is performed based on the small signal transfer function of a two-stage dc-dc-ac converter. To verify the effectiveness of proposed control algorithm, a 1 kW hardware prototype has been built and experimental results are presented.
Keywords
Grid-connected inverter; Compensator design; Second-order harmonic current; Dynamic response;
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