The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Droop Control to Compensate Load Voltage Unbalance for Inverter-based Distributed Generations with Unequal Impedance Lines

불균등 임피던스 선로를 갖는 인버터기반 분산전원의 부하전압 불평형을 보상하는 드룹 제어

  • Yang, Won-Mo (Dept. of Electrical Engineering, Myongji University) ;
  • Kim, Hyun-Jun (Dept. of Electrical Engineering, Myongji University) ;
  • Han, Byung-Moon (Dept. of Electrical Engineering, Myongji University)
  • Received : 2016.03.14
  • Accepted : 2016.06.13
  • Published : 2016.07.01
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Abstract

This paper proposes a droop control scheme to compensate the unbalanced line-to-line voltage of unbalanced 3-phase load which is coupled with two inverter-based distributed generations through unequal impedance lines. Unbalanced line-to-line load voltages occur due to using single-phase loads, which brings about bad effects on the coupled inverters and the distributed generations. In order to compensate the unbalanced line-to-line voltages, a positive sequence voltage control was used for sharing the active and reactive power and a negative sequence control was used for reducing the negative sequence voltage. The feasibility of the proposed scheme was first verified by computer simulations, and then experiments with a hardware set-up built in the lab. The experimental results were compared with the simulation results to confirm the feasibility of the proposed scheme.

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References

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