The number of wind turbines connected to the grid is steadily increasing in recent years. This situation forced the revision of the electric utilities grid codes requirements, to remain connected during grid faults, i.e. to ride through the faults, especially for those with power electronic converters, such as DFIGs. In fault condition, the voltage at the Point of Common Coupling (PCC) drops immediately and The grid voltage dips imposed at the connection point of the DFIG to the grid induce large voltages in the rotor windings, resulting in high rotor current, which can damage the rotor-side converter and disconnect from grid. In this paper, resistive and inductive superconducting fault current limiter (SFCL) is used to improve the fault ridethrough (FRT) of wind turbine generation system (WTGS). The WTGS is considered as a variable-speed system, equipped with a DFIG. The analytical and simulation studies of the resistive SFCL for improving FRT capability are presented and compared with the inductive SFCL.
Summary
Double circuit transmission lines (DCTLs) are widely used to endure the reliable and secure connection of the wind power plants (WPPs) to the grid. This article proposes a new double‐circuit bridge‐type fault current limiter (DBFCL) for enhancing fault ride‐through (FRT) capability of WPPs integrated to the grid through DCTLs. It inter‐lines between two circuits of DCTLs. The main advantage of the proposed DBFCL is reducing the number as well as the power rating of components, which reduces the cost and volume of the proposed DBFCL as compared to use of two bridge‐type fault current limiters (BFCLs) in DCTLs. The structure, control, and capability of the proposed DBFCL are discussed in this article. To examine the FRT performance of the proposed DBFCL, the doubly fed induction generator (DFIG)‐based WPPs is used and extensive simulations are executed in PSCAD/EMTDC software. Also, the DBFCL performance is compared with the case of using one BFCL in WPP substation, crowbar, DC link chopper, and series‐resonance fault current limiter (SRFCL) schemes. Simulation results reveal that the DBFCL not only augments the FRT of WPPs with a lower cost, but it also has a superior performance compared with the case of using BFCL in WPP substation. Also, the DBFCL outperforms the crowbar system, the DC link chopper, and the SRFCL.
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