An LVRT Control Strategy Based on Flux Linkage Tracking for DFIG-Based WECS

For doubly fed induction generator (DFIG)-based wind energy conversion systems (WECSs), large electromotive force will be induced in the rotor circuit during grid faults. Without proper protection scheme, the rotor side of DFIG will suffer from overcurrents, which may even destroy the rotor-side converter (RSC). To mitigate this problem, a new flux-linkage-tracking-based low-voltage ride-through (LVRT) control strategy is proposed to suppress the short-circuit rotor current. Under the proposed control strategy, the rotor flux linkage is controlled to track a reduced fraction of the changing stator flux linkage by switching the control algorithm of RSC during grid faults. To validate the proposed control strategy, a case study of a typical 1.5-MW DFIG-based WECS is carried out by simulation using the full-order model in SIMULINK/SimPowerSystems. In the case study, a comparison with a typical LVRT method based on RSC control is given, and the effect of the control parameter on the control performance is also investigated. Finally, the validity of the proposed method is further verified by means of laboratory experiments with a scaled-size DFIG system.

[1]  F. Blaabjerg,et al.  Rotor Voltage Dynamics in the Doubly Fed Induction Generator During Grid Faults , 2010, IEEE Transactions on Power Electronics.

[2]  Shahram Karimi,et al.  FPGA-Based Real-Time Power Converter Failure Diagnosis for Wind Energy Conversion Systems , 2008, IEEE Transactions on Industrial Electronics.

[3]  Bin Wu,et al.  A Novel Hardware-Based All-Digital Phase-Locked Loop Applied to Grid-Connected Power Converters , 2011, IEEE Transactions on Industrial Electronics.

[4]  Zhao Fang.  Crowbar Control Strategy for Doubly Fed Induction Generator of Wind Farm During Power Grid Voltage Dips , 2008 .

[5]  Yong Kang,et al.  An Improved Low-Voltage Ride-Through Control Strategy of Doubly Fed Induction Generator During Grid Faults , 2011, IEEE Transactions on Power Electronics.

[6]  Geng Yang,et al.  Evaluation of the Control Limit of Rotor-Side Converters in DFIG-Based Wind Energy Conversion Systems under Symmetrical Voltage Dips , 2011, 2011 Asia-Pacific Power and Energy Engineering Conference.

[7]  Liao Yong.  Analysis on the Operations of an AC Excited Wind Energy Conversion System with Crowbar Protection , 2007 .

[8]  Luis Marroyo,et al.  Ride Through of Wind Turbines With Doubly Fed Induction Generator Under Symmetrical Voltage Dips , 2009, IEEE Transactions on Industrial Electronics.

[9]  Yiqiao Liang.  A new time domain positive and negative sequence component decomposition algorithm , 2003, 2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491).

[10]  Francisco A. S. Neves,et al.  A Method for Extracting the Fundamental-Frequency Positive-Sequence Voltage Vector Based on Simple Mathematical Transformations , 2008, IEEE Transactions on Industrial Electronics.

[11]  J. Morren,et al.  Short-Circuit Current of Wind Turbines With Doubly Fed Induction Generator , 2007, IEEE Transactions on Energy Conversion.

[12]  Bin Wu,et al.  Unified Power Control for PMSG-Based WECS Operating Under Different Grid Conditions , 2011, IEEE Transactions on Energy Conversion.

[13]  J. Morren,et al.  Ridethrough of wind turbines with doubly-fed induction generator during a voltage dip , 2005, IEEE Transactions on Energy Conversion.

[14]  Friedrich Wilhelm Fuchs,et al.  Current Sensor Fault Detection, Isolation, and Reconfiguration for Doubly Fed Induction Generators , 2009, IEEE Transactions on Industrial Electronics.

[15]  Lie Xu,et al.  Coordinated Control of DFIG's Rotor and Grid Side Converters During Network Unbalance , 2008, IEEE Transactions on Power Electronics.

[16]  Humberto Pinheiro,et al.  Robust Controller for DFIGs of Grid-Connected Wind Turbines , 2011, IEEE Transactions on Industrial Electronics.

[17]  Barry W. Williams,et al.  Improved Control of DFIG Systems During Network Unbalance Using PI–R Current Regulators , 2009, IEEE Transactions on Industrial Electronics.

[18]  G. Yang,et al.  Short circuit current analysis of DFIG wind turbines with crowbar protection , 2009, 2009 International Conference on Electrical Machines and Systems.

[19]  Frede Blaabjerg,et al.  Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults , 2007, IEEE Transactions on Industrial Electronics.

[20]  I. Erlich,et al.  Modeling of Wind Turbines Based on Doubly-Fed Induction Generators for Power System Stability Studies , 2007, IEEE Transactions on Power Systems.

[21]  J.V. Milanovic,et al.  Assessing Transient Response of DFIG-Based Wind Plants—The Influence of Model Simplifications and Parameters , 2008, IEEE Transactions on Power Systems.

[22]  D. Santos-Martin,et al.  Providing Ride-Through Capability to a Doubly Fed Induction Generator Under Unbalanced Voltage Dips , 2009, IEEE Transactions on Power Electronics.

[23]  Wlodzimierz Koczara,et al.  DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications , 2008, IEEE Transactions on Industrial Electronics.

[24]  Paul-Etienne Vidal,et al.  Dual Direct Torque Control of Doubly Fed Induction Machine , 2007, IEEE Transactions on Industrial Electronics.

[25]  Peter Tavner,et al.  Control of a doubly fed induction generator in a wind turbine during grid fault ride-through , 2006 .

[26]  R. W. De Doncker,et al.  Doubly fed induction generator systems for wind turbines , 2002 .

[27]  J.A. Ferreira,et al.  Operation of Grid-Connected DFIG Under Unbalanced Grid Voltage Condition , 2009, IEEE Transactions on Energy Conversion.

[28]  Dewei Xu,et al.  Stability Analysis and Improvements for Variable-Speed Multipole Permanent Magnet Synchronous Generator-Based Wind Energy Conversion System , 2011, IEEE Transactions on Sustainable Energy.

[29]  Mansour Mohseni,et al.  Fault ride-through capability enhancement of doubly-fed induction wind generators , 2011 .

[30]  G. Venkataramanan,et al.  A Fault Tolerant Doubly Fed Induction Generator Wind Turbine Using a Parallel Grid Side Rectifier and Series Grid Side Converter , 2008, IEEE Transactions on Power Electronics.

[31]  P. Sanchis,et al.  Dynamic Behavior of the Doubly Fed Induction Generator During Three-Phase Voltage Dips , 2007, IEEE Transactions on Energy Conversion.

[32]  Marian P. Kazmierkowski,et al.  Control of Three-Level PWM Converter Applied to Variable-Speed-Type Turbines , 2009, IEEE Transactions on Industrial Electronics.

[33]  J. López,et al.  Wind Turbines Based on Doubly Fed Induction Generator Under Asymmetrical Voltage Dips , 2008, IEEE Transactions on Energy Conversion.