Enhancement Fault Ride-Through Capability of DFIG By Using Resistive and Inductive SFCLs

Abstract

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.

RETRACTED: A new approach for transient stability improvement of a grid-connected doubly fed induction generator–based wind generator

“…In the literature, it was found that to enhance the transient stability of the DFIG-based WG, some energy storage systems (flywheel energy storage (FES) (Wang et al, 2011), superconducting magnetic energy storage (SMES) (Yunus et al, 2012)), reactive var compensators (Static Synchronous Compensator (STATCOM) (Wang and Truong, 2013)), and fault current limiters (series dynamic braking resistor (SDBR) (Okedu et al, 2011), superconducting fault current limiter (SFCL) (Azizpour et al, 2014), and thyristor-switched series capacitor (TCSC) (Mohammadpour and Santi, 2014)) were proposed. Although the above-mentioned solutions have the capability to improve the transient stability, they have some limitation.…”

Transient behavior representation, contribution to fault current assessment, and transient response improvement in DFIG-based wind turbines assisted with crowbar hardware

“…Approaches proposed in literatures for the LVRT capability enhancement of DFIGs are divided into 2 main groups: LVRT improvement by adding external hardware [5][6][7][8][9][10][11][12][13][14][15][16][17] and LVRT enhancement by using advanced control methods and modifying the DFIG converter control. [18][19][20][21][22][23][24][25][26] The first group of LVRT approaches uses external passive and active equipments and hardware.…”

“…Some literatures use passive elements such as crowbar, fault current limiter, and series damping resistor for LVRT improvement . A number of related papers use supercapacitor energy storage system, superconducting fault current limiter with magnetic energy storage device, flexible ac transmission systems, new different types of current limiters, and series converter located between the stator and grid . Such remedies may be technically feasible, but require additional converters and other equipment, which are costly.…”