Advanced Control Strategy of DFIG Wind Turbines for Power System Fault Ride Through

This paper presents an advanced control strategy for the rotor and grid side converters of the doubly fed induction generator (DFIG) based wind turbine (WT) to enhance the low-voltage ride-through (LVRT) capability according to the grid connection requirement. Within the new control strategy, the rotor side controller can convert the imbalanced power into the kinetic energy of the WT by increasing its rotor speed, when a low voltage due to a grid fault occurs at, e.g., the point of common coupling (PCC). The proposed grid side control scheme introduces a compensation term reflecting the instantaneous DC-link current of the rotor side converter in order to smooth the DC-link voltage fluctuations during the grid fault. A major difference from other methods is that the proposed control strategy can absorb the additional kinetic energy during the fault conditions, and significantly reduce the oscillations in the stator and rotor currents and the DC bus voltage. The effectiveness of the proposed control strategy has been demonstrated through various simulation cases. Compared with conventional crowbar protection, the proposed control method can not only improve the LVRT capability of the DFIG WT, but also help maintaining continuous active and reactive power control of the DFIG during the grid faults.

[1]  Wei Qiao,et al.  Feed-forward transient current control for low-voltage ride-through enhancement of DFIG wind turbines , 2011, 2011 IEEE/PES Power Systems Conference and Exposition.

[2]  Anca Daniela Hansen,et al.  Fault ride-through capability of DFIG wind turbines , 2007 .

[3]  Lie Xu,et al.  Direct active and reactive power control of DFIG for wind energy generation , 2006, IEEE Transactions on Energy Conversion.

[4]  Hui Li,et al.  An Improved Control Strategy of Limiting the DC-Link Voltage Fluctuation for a Doubly Fed Induction Wind Generator , 2008, IEEE Transactions on Power Electronics.

[5]  Xiao-Ping Zhang,et al.  Small signal stability analysis and optimal control of a wind turbine with doubly fed induction generator , 2007 .

[6]  Stavros A. Papathanassiou,et al.  A review of grid code technical requirements for wind farms , 2009 .

[7]  Ehab F. El-Saadany,et al.  An improved fault ride-through strategy for doubly fed induction generator-based wind turbines , 2008 .

[8]  Thomas Ackermann,et al.  Wind Power in Power Systems , 2005 .

[9]  Damian Flynn,et al.  Decoupled-DFIG Fault Ride-Through Strategy for Enhanced Stability Performance During Grid Faults , 2010, IEEE Transactions on Sustainable Energy.

[10]  F. Mei,et al.  Modal Analysis of Grid-Connected Doubly Fed Induction Generators , 2006, IEEE Transactions on Energy Conversion.

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

[12]  Frede Blaabjerg,et al.  Control of Variable Speed Wind Turbines with Doubly-Fed Induction Generators , 2004 .

[13]  Vladislav Akhmatov,et al.  Induction Generators for Wind Power , 2007 .

[14]  K. Hameyer,et al.  Control strategies of doubly fed induction generators to support grid voltage , 2009, 2009 IEEE International Electric Machines and Drives Conference.

[15]  Yongdong Li,et al.  Improved Crowbar Control Strategy of DFIG Based Wind Turbines for Grid Fault Ride-Through , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[16]  Mohsen Rahimi,et al.  Transient Performance Improvement of Wind Turbines With Doubly Fed Induction Generators Using Nonlinear Control Strategy , 2010, IEEE Transactions on Energy Conversion.

[17]  J. Chow.  A pole-placement design approach for systems with multiple operating conditions , 1990 .

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

[19]  Li Ran,et al.  Control of a doubly fed induction generator in a wind turbine during grid fault ride-through , 2006, IEEE Transactions on Energy Conversion.

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

[21]  Jin Yang,et al.  A series dynamic resistor based converter protection scheme for doubly-fed induction generator during various fault conditions , 2010, 2009 IEEE Power & Energy Society General Meeting.

[22]  Lie Xu,et al.  Coordinated reactive power control for facilitating fault ride through of doubly fed induction generator- and fixed speed induction generator-based wind farms , 2010 .

[23]  Jon Clare,et al.  Doubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation , 1996 .

[24]  N. Mohan,et al.  A novel robust low voltage and fault ride through for wind turbine application operating in weak grids , 2005, 31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005..

[25]  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.