Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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A Study on the Estimation of the Resonance Frequency for an Active Damping Technique of Grid Connected Converters

계통 연계형 컨버터의 능동 댐핑을 위한 공진주파수 추정 기능에 관한 연구

  • Park, Il-Woo (Samsung Heavy Industries) ;
  • Lee, Woo-Cheol (Hankyong National University Dept. of Electrical Electronic & Control Engineering, Institute for information technology convergence)
  • 박일우 (삼성중공업) ;
  • 이우철 (한경대학교 전기전자제어공학과, IT융합연구소)
  • Received : 2012.10.24
  • Accepted : 2012.12.13
  • Published : 2013.01.31
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Abstract

The renewable energy sources is raising for use of grid connected systems, for which higher power quality requirements are being issued. A grid connected converter requires a LC-filter stage, this one is lightly damped for efficiency constraints. Hence, it is subject to resonance if excited by the converter current harmonics or pre-exciting grid voltage harmonics. In this paper, an active damping technique employing notch filter for damping of the resonance frequency is introduced. This technique doesn't need to additional sensors. In addition, it is simple to apply for various systems. Monitoring of the resonance frequency ensures the stable operation of the proper connection and disconnection of the grid. This paper proposes the estimating method of a resonant frequency to determine the cut-off frequency of the notch filter. This method is validated by both simulation and experimental results.

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References

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