The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Low Frequency Current Reduction using a Quasi-Notch Filter operated in Two-Stage DC-DC-AC Grid-Connected Systems

Quasi-Notch Filter를 이용한 DC-DC-AC 계통연계형 단상 인버터에서의 저주파 전류 감소 기법

  • Jung, Hong-Ju (Dept. of Electrical Eng., EECS Lab, Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical and Biomedical Eng., Hanyang University)
  • Received : 2013.12.03
  • Accepted : 2014.03.11
  • Published : 2014.06.20
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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 double-fundamental 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 double-fundamental 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.

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References

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