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

The Korean Institute of Power Electronics (전력전자학회)
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Comparison of Current Controllers of Grid-connected PCS for Distributed Resources

분산전원용 계통연계형 PCS의 전류제어기 비교

  • Park, Jong-Hyoung (Dept. of Electrical Engineering, Kyungpook Nat'l Univ.) ;
  • Jo, Teak-Hyun (Energy Environment Research, Marine Research Institute, Samsung Heavy Industries Co. LTD.) ;
  • Kim, Heung-Geun (Dept. of Electrical Engineering, Kyungpook Nat'l Univ.) ;
  • Chun, Tae-Won (Dept. of Electrical Engineering, University of Ulsan) ;
  • Nho, Eui-Cheol (Dept. of Electrical Engineering, PuKyong Nat'l Univ.) ;
  • Cha, Hon-Nyung (Dept. of Electrical Engineering, Kyungpook Nat'l Univ.)
  • Received : 2011.10.13
  • Accepted : 2012.04.06
  • Published : 2012.06.20
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Abstract

In this paper, three current controllers for a grid-connected PCS using an LCL filter are compared and analyzed. Current controllers discussed in this paper are linear controllers such as PI (proportional-integral), PR (proportional-resonant), and DB (deadbeat) controller. Both transient and steady state responses of each controller are compared through both simulation and experiment. Although the DB controller has the fastest transient response and the lowest THD in the steady state, the DB controller has two cycles delay of current response in the steady state and has the stability problem which can be occurred due to variation of the system parameters. On the one hand the responses of PR controller are not much different from that of DB controller but the other hand that are not only strong to noise of grid current but also have smaller THD than PI controller. Considering the response time and stability issue of three controllers, the PR controller has the best performance among three controllers and thus can be strongly recommended as a current controller for a grid-connected PCS.

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References

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