Sliding Mode Controller-Based BFCL for Fault Ride-Through Performance Enhancement of DFIG-Based Wind Turbines

Abstract

The fault ride-through (FRT) capability and fault current issues are the main challenges in doubly fed induction generator- (DFIG-) based wind turbines (WTs). Application of the bridge-type fault current limiter (BFCL) was recognized as a promising solution to cope with these challenges. This paper proposes a nonlinear sliding mode controller (SMC) for the BFCL to enhance the FRT performance of the DFIG-based WT. This controller has robust performance in unpredicted voltage sag level and nonlinear features. Theoretical discussions, power circuit, and nonlinear control consideration of the SMC-based BFCL are conducted, and then, its performance is verified through time-domain simulations in the PSCAD/EMTDC environment. To reduce the chattering phenomenon and decrease the reaching time, it used the exponential reaching law (ERL) for designed SMC. Also, the SMC-based BFCL performance is compared with the conventional and PI controller-based BFCL for both symmetrical and asymmetrical short-circuit faults. Simulation results reveal that the SMC-based BFCL provides better performance compared with the conventional and PI controller-based BFCL to enhance the FRT.

Nonlinear Variable Resistor-Based FCL for Fault Ride-Through Performance Enhancement of DFIG-Based Wind Turbines

“…i dqs and rotor current i dqr are the d − q components of the stator and rotor currents. Considering Figure 3, the GSC dynamic equations are written as [40] V dqs � V dqg + R g i dqg + L g dλ dqg dt + ω s L g i dqg .…”

“…On the other hand, the power system has inherently nonlinear characteristics and connection of WTs including nonlinear power electronics based converters that increase this characteristic. As a result, utilization of nonlinear controllers has better performance under grid disturbances [38,40]. It is worthy to state that, there are a few studies regarding implementation of a control system to the BFCL for enhancing a DFIG performance under fault condition.…”

Protection of Sensitive Loads in Distribution Systems Using a BSFCL-DVR System

“…In [ 19 ], a multi-resistor BFCL (MRBFCL) is proposed to mitigate the PCC voltage under different voltage sag levels. In this configuration multi resistors has been used instead of single resistor in the conventional BFCL in [ 20 ]. It is implemented to the DFIG [ 19 ] and permanent-magnet synchronous generator (PMSG)-based [ 19 ] wind turbines for enhancing the FRT, respectively.…”

Controllable-Dual Bridge Fault Current Limiter for Interconnection Micro-Grids

“…In [10], an inductive-type SFCL was used for interconnection between the AC-type MG to the main grid to control the short-circuit current and power flow. In [11], an inductive-type SFCL was used for the integration of the downstream wind-based DG to the main AC grid. In [12], a flux-coupling type SFCL was used to satisfy the fault-rid through (FRT) requirement of doublefed induction-generator (DFIG)-based DG in MG.…”