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Abstract:   (143 Views)
Improving transient voltage stability is one of the most important issues that must be provided by doubly fed induction generator (DFIG)-based wind farms (WFs) according to the grid code requirement. This paper proposes adjusted DC-link chopper based passive voltage compensator and modified transient voltage controller (MTVC) based active voltage compensator for improving transient voltage stability. MTVC is a controller-based approach, in which by following a voltage dip (VD) condition, the voltage stability for the WF can be improved. In this approach, a voltage dip index (VDI) is proposed to activate/deactivate the control strategy, in which, two threshold values are used. In the active mode, the active and reactive power are changed to decrease the rotor current and boost the PCC voltage, respectively. Based on the control strategy, in a faulty grid, DFIG not only will be able to smooth DC-link voltage fluctuations and reduces rotor overcurrents but also it will increase the voltage of point of common coupling (PCC). Therefore, it improves transient voltage stability. The simulation results show the effectiveness of the proposed strategy for improving voltage stability in the DFIG.
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  • For the transient voltage stability of DFIG, a new controller-based strategy is proposed.
  • In the proposed strategy, active and reactive power reference values are changed.
  • Modified Transient voltage control using the VDI index is used to change references.
  • PI parameters of DFIG are optimally tuned using the imperialist competitive algorithm.

Type of Study: Special Issue on Smart Grids | Subject: Voltage Dips/Sags
Received: 2019/09/25 | Accepted: 2020/02/13 | Published: 2020/04/17

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© 2020 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.