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access icon free Modified switch type fault current limiter for low-voltage ride-through enhancement and reactive power support of DFIG-WT under grid faults

  • Author(s): Rafiq Asghar 1 ; Faisal Rehman 2 ; Zahid Ullah 3 ; Ali Aman 4 ; Kashif Iqbal 1 ; Agha Ali Nawaz 5
    • View affiliations
  • Source: Volume 14, Issue 9, 06 July 2020, p. 1481 – 1490
    DOI:  10.1049/iet-rpg.2019.1058 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Received 16/09/2019, Accepted 09/03/2020, Revised 06/01/2020, Published 10/03/2020

The sudden voltage drop may upsurge the current level and trigger the self-protective system to disconnect the wind turbines that are detrimental for grid constancy. A novel structure of a modified switch type fault current limiter (M-STFCL) is proposed that protects the doubly-fed induction generator wind turbine (DFIG-WT) during the symmetrical and asymmetrical grid faults. The M-STFCL is cost-effective and requires little maintenance during operation. The proposed system maintains the rotor current and DC-link voltage below the maximum acceptable limits, thus, fortify the back-back converters. The M-STFCL is tested with both the sliding-mode control (SMC) and proportional–integral (PI) controller and their results are compared. From the simulation results, it is obvious that SMC has edged over the PI controller and demonstrated superior control over the critical parameters. The performance of M-STFCL is also compared with the conventional switch type fault current limiter and the analytical results clearly validate the significance of the proposed system.

Inspec keywords: PI control; asynchronous generators; wind power plants; power generation control; variable structure systems; wind turbines; rotors; fault current limiters; power generation faults; power grids

Other keywords: self-protective system; rotor; asymmetrical grid faults; low-voltage ride-through enhancement; wind turbines; reactive power support; conventional switch type fault current limiter; induction generator wind turbine; DFIG-WT; M-STFCL; maximum acceptable limits; symmetrical grid faults; sudden voltage drop; grid constancy; modified switch type fault current limiter

Subjects: Protection apparatus; Control of electric power systems; Asynchronous machines; Wind power plants; Multivariable control systems

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