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

The Korean Institute of Power Electronics (전력전자학회)
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LCL Filter Design for Grid-connected PCS Using Total Harmonic Distortion and Ripple Attenuation Factor

총고조파 왜율과 리플 감쇄율을 이용한 계통연계형 PCS용 LCL 필터 설계

  • 박종형 (경북대 대학원 전자전기컴퓨터학부) ;
  • 지민훈 ((주)LS산전 자동화제품연구소) ;
  • 김흥근 (경북대 IT대학 전기공학과) ;
  • 전태원 (울산대 전기전자정보시스템공학부) ;
  • 노의철 (부경대 전기공학과)
  • Received : 2010.02.17
  • Accepted : 2010.05.13
  • Published : 2010.06.20
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Abstract

This paper describes a design method of LCL filter for grid-connected three-phase PWM inverter. First, by analyzing the ripple component of phase voltages and currents according to the PWM pattern of grid-connected three-phase inverter, the RMS value of the current ripple can be calculated. Then based on the analysis, the current THD in the inverter-side can be defined. After that by analyzing the dependency between the current THD of the system and the current ripple attenuation, the parameter of LCL filter can be designed. Finally, the described LCL filter design method is verified by showing a good agreement between the target current $THD_g$ and the actual one through the simulation and experiment.

본 논문에서는 총고조파 왜율(THD, Total Harmonic Distortion)과 리플 감쇄율(RAF, Ripple Attenuation Factor)을 이용한 계통연계 인버터용 LCL 필터 설계 방법을 제안한다. 인버터 측 인덕터 전류의 총고조파 왜율($THD_i$)과 필터 커패시터와 계통 측 인덕터 사이의 전류 리플 감쇄율(RAF), 그리고 계통에 주입되는 전류의 총고조파 왜율($THD_g$)의 관계를 분석하여 관계식을 도출하고, 이 관계식을 바탕으로 계통 주입 전류의 $THD_g$ 목표치를 만족하는 $THD_i$와 RAF를 선정하여 계통 측 인덕터($L_g$)와 인버터 측 인덕터($L_i$)의 인덕턴스 값을 계산한다. 한편 커패시터의 커패시턴스 값은 커패시터에 유입되는 무효전력을 고려하여 선정한다. 제안한 방법으로 LCL를 설계하여 시뮬레이션과 실험을 통해 계통에 주입되는 전류의 $THD_g$가 목표치를 만족하는 것을 보임으로써 설계 방법의 타당성을 입증한다.

Keywords

References

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