Symmetrical and asymmetrical low‐voltage ride through of doubly‐fed induction generator wind turbines using gate controlled series capacitor

Abstract

This study proposes a new method to improve low-voltage ride through of the doubly-fed induction generator (DFIG) wind turbines (WTs) using gate-controlled series capacitor (GCSC) in series with the generator rotor. Using GCSC, as soon as a voltage dip occurs at the generator's terminals, the GCSC inserts its capacitor in series with the rotor, increasing the voltage seen by the rotor winding. Consequently, the rotor over-current is limited and transmission of the inrush energy to the rotor side converter is reduced. Moreover, by this method, the chopper is not required for protecting the DC-link capacitor. Unlike the Crowbar method, which control of the generator is lost during the fault, the proposed method in this study avoids the loss of control during the grid faults. To validate the effectiveness of the proposed method, extensive time-domain simulation is performed using MATLAB/SIMULINK on a 1.5 MW DFIG-based WT.

Role of fault ride‐through strategies for power grids with 100% power electronic‐interfaced distributed renewable energy resources

“…In addition to the crowbar and the DC‐link chopper techniques, dynamic voltage restorer (DVR; Alaraifi, Moawwad, El Moursi, & Khadkikar, ; Wessels, Gebhardt, & Fuchs, ), resistive fault current limiter (FCL; Guo, & , L. Xiao, S. Dai, Y. Li, X. Xu, W. Zhou, L. Li, ; Jalilian, Naderi, Negnevitsky, Hagh, & Muttaqi, ), superconducting fault‐current limiter (SFCL; Elshiekh, Mansour, & Azmy, ; Guo, Xiao, & Dai, ; Ngamroo & Karaipoom, ), superconducting magnetic energy storage (SMES) system (Guo et al, ; Ngamroo & Karaipoom, ), superconducting coil in DC link (Karaipoom & Ngamroo, ), gate‐controlled series capacitor (Mohammadpour, Zadeh, & Tohidi, ), parallel supercapacitor on DC link (Huchel, El Moursi, & Zeineldin, ), series voltage compensators (Ambati, Kanjiya, & Khadkikar, ), battery ESS (Guo, Xiao, & Dai, ), and dynamic resistor‐based (Yan, Venkataramanan, Wang, Dong, & Zhang, ) techniques are proposed for DFIG LVRT improvement. However, unlike the other passive methods (i.e., crowbar, DC‐link chopper), these methods require substantial hardware circuits, which would increase the overall system cost and complexity of the control scheme.…”

Low‐voltage ride through control strategy of virtual synchronous generator based on the analysis of excitation state

“…Besides, only a few of above literatures have used the existing operational experiences of SG to analyse and improve the performance of VSG. The authors in [16,17] put forward excellent LVRT schemes for doubly fed induction generator, but it still needs to provide strict theoretical analysis of the VSG. In [18][19][20], virtual current loop was used to make the converter act as a controlled current source.…”

Fuzzy grey wolf optimization for controlled low-voltage ride-through conditions in grid-connected wind turbine with doubly fed induction generator

“…[4][5][6][7] The doubly fed induction generator (DFIG) is one of the existing speed generators that have the largest world market share for wind turbines. [8][9][10] Generally, DFIG comprises a wound rotor induction generator with stator windings and rotor windings directly connected to the grid, which forms two ac/dc back-to-back converters. [11][12][13][14][15][16] This topology remains cost-effective since these converters are applicable for only one-third of the power rating of the turbine.…”