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

The Korean Institute of Electrical Engineers (대한전기학회)
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Voltage Control for a Wind Power Plant Based on the Available Reactive Current of a DFIG and Its Impacts on the Point of Interconnection

이중여자 유도형 풍력발전기 기반 풍력단지의 계통 연계점 전압제어

  • Usman, Yasir (Dept. of Electrical Engineering, Chonbuk National University) ;
  • Kim, Jinho (Dept. of Electrical Engineering, Chonbuk National University) ;
  • Muljadi, Eduard (National Renewable Energy Laboratory) ;
  • Kang, Yong Cheol (Dept. of Electrical Engineering, Chonbuk National University)
  • Received : 2015.12.05
  • Accepted : 2015.12.13
  • Published : 2016.01.01
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Abstract

Wake effects cause wind turbine generators (WTGs) within a wind power plant (WPP) to produce different levels of active power and subsequent reactive power capabilities. Further, the impedance between a WTG and the point of interconnection (POI)-which depends on the distance between them-impacts the WPP's reactive power injection capability at the POI. This paper proposes a voltage control scheme for a WPP based on the available reactive current of the doubly-fed induction generators (DFIGs) and its impacts on the POI to improve the reactive power injection capability of the WPP. In this paper, a design strategy for modifying the gain of DFIG controller is suggested and the comprehensive properties of these control gains are investigated. In the proposed scheme, the WPP controller, which operates in a voltage control mode, sends the command signal to the DFIGs based on the voltage difference at the POI. The DFIG controllers, which operate in a voltage control mode, employ a proportional controller with a limiter. The gain of the proportional controller is adjusted depending on the available reactive current of the DFIG and the series impedance between the DFIG and the POI. The performance of the proposed scheme is validated for various disturbances such as a reactive load connection and grid fault using an EMTP-RV simulator. Simulation results demonstrate that the proposed scheme promptly recovers the POI voltage by injecting more reactive power after a disturbance than the conventional scheme.

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References

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