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

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.

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Research on Characteristics of Stator and Rotor Fault Current of DFIG

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1092-1093.325 ◽

2015 ◽

Vol 1092-1093 ◽

pp. 325-331

Author(s):

Hong Bo Zhao ◽

Wen Hui Shi ◽

Hao Zha ◽

Jing Wu

Keyword(s):

Power System ◽

Wind Turbines ◽

Short Circuit ◽

Transient Processes ◽

Stable Operation ◽

Fault Current ◽

Electromagnetic Transient ◽

Fault Ride Through ◽

Three Phase ◽

Current Characteristics

The abrupt dip of grid voltage would provoke a series of electromagnetic transient processes in stator and rotor of DFIG, which would threat the security of wind turbines fault ride through (LVRT) and stable operation of power system. Analyzing the fault current characteristics of DFIG is very useful to improve the LVRT strategy and adjust the relay protection setting of power system. In this paper, electromagnetic transient processes of DFIG are given a detail analysis after protection circuit of DFIG works due to the dip of three phase voltage in system. Then, the general expression of stator and rotor fault current is derived, and the validity of this method is verified. At last, the influences of the system short-circuit capacity and wind turbines accessing capacity on the fault current and system protections are analyzed when the wind turbines are accessed to the distribution network.

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

Mathematical Problems in Engineering ◽

10.1155/2021/9934887 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Mehdi Firouzi ◽

Mohammadreza Shafiee ◽

Mojtaba Nasiri

Keyword(s):

Wind Turbines ◽

Performance Enhancement ◽

Short Circuit ◽

Variable Resistor ◽

Fault Ride Through ◽

Three Phase ◽

Bridge Type ◽

Doubly Fed ◽

Grid Side ◽

Short Circuit Fault

Fault ride-through (FRT) requirement is a matter of great concern for doubly fed induction generator (DFIG-) based wind turbines (WTs). This study presents a nonlinear variable resistor- (NVR-) based bridge-type fault current limiter (BFCL) to augment the FRT performance of DFIG-based WTs. First, the BFCL operation and nonlinear control design consideration of the proposed NVR-based BFCL are presented. Then, the NVR-BFCL performance is validated through simulation in PSCAD/EMTDC software. In addition, the NVR-based BFCL performance is compared with the fixed resistor- (FR-) based BFCL for a three-phase symmetrical short circuit fault at the grid side. Simulation results reveal that the NVR-based BFCL provides a smooth and effective FRT scheme and outperforms the FR-based BFCL.

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Study of the Contribution to the Robust Control of a Small Variable Speed Wind Turbine Based on Permanent Magnet Synchronous Generator: Comparison between PI Controller and Sliding Mode Controller

International Review of Automatic Control (IREACO) ◽

10.15866/ireaco.v7i6.4482 ◽

2014 ◽

Vol 7 (6) ◽

pp. 551 ◽

Cited By ~ 1

Author(s):

Walid Ouled Amor ◽

M. Ghariani ◽

R. Neji

Keyword(s):

Robust Control ◽

Permanent Magnet ◽

Sliding Mode ◽

Synchronous Generator ◽

Pi Controller ◽

Sliding Mode Controller ◽

Variable Speed ◽

Permanent Magnet Synchronous Generator ◽

Variable Speed Wind Turbine ◽

Generator Comparison

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Second‐order sliding mode control of wind turbines to enhance the fault‐ride through capability under unbalanced grid faults

International Journal of Circuit Theory and Applications ◽

10.1002/cta.3023 ◽

2021 ◽

Author(s):

Khalfallah Tahir ◽

Tayeb Allaoui ◽

Mouloud Denai ◽

Saad Mekhilef ◽

Cheikh Belfedal ◽

...

Keyword(s):

Sliding Mode Control ◽

Wind Turbines ◽

Sliding Mode ◽

Second Order ◽

Mode Control ◽

Fault Ride Through ◽

Unbalanced Grid ◽

Second Order Sliding Mode

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Short‐circuit current reduction techniques of the doubly‐fed induction generator based wind turbines for fault ride through enhancement

IET Renewable Power Generation ◽

10.1049/iet-rpg.2016.0372 ◽

2017 ◽

Vol 11 (7) ◽

pp. 1033-1040 ◽

Cited By ~ 13

Author(s):

Ahmed El‐Naggar ◽

Istvàn Erlich

Keyword(s):

Wind Turbines ◽

Short Circuit ◽

Short Circuit Current ◽

Induction Generator ◽

Doubly Fed Induction Generator ◽

Reduction Techniques ◽

Fault Ride Through ◽

Doubly Fed ◽

Current Reduction

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Full-Load Converter Connected Asynchronous Generators for MW Class Wind Turbines

Wind Engineering ◽

10.1260/030952405774857833 ◽

2005 ◽

Vol 29 (4) ◽

pp. 341-351 ◽

Cited By ~ 7

Author(s):

Vladislav Akhmatov

Keyword(s):

Wind Turbines ◽

Short Circuit ◽

Wind Farms ◽

Variable Speed ◽

Full Load ◽

Frequency Converters ◽

Fault Ride Through ◽

System Operator ◽

And Control ◽

Large Wind

Wind turbines equipped with full-load converter-connected asynchronous generators are a known concept. These have rating up to hundreds of kW and are a feasible concept for MW class wind turbines and may have advantages when compared to conventional wind turbines with directly connected generators.* The concept requires the use of full-scale frequency converters, but the mechanical gearbox is smaller than in conventional wind turbines of the same rating. Application of smaller gearbox may reduce the no-load losses in the wind turbines, which is why such wind turbines with converter connected generators may start operation at a smaller wind speed. Wind turbines equipped with such converted connected asynchronous generators are pitch-controlled and variable-speed. This allows better performance and control. The converter control may be applied to support the grid voltage at short-circuit faults and to improve the fault-ride-through capability of the wind turbines, which makes the concepts relevant for large wind farms. The Danish transmission system operator Energinet-DK has implemented the general model of wind turbines equipped with converter connected asynchronous generators with the simulation tool Powerfactory (DlgSilent). The article presents Energinet-DK's experience of modeling this feasible wind turbine concept.

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