A new method to improve the LVRT of DFIG based on the current compensation

Doubly fed induction generator (DFIG) has been widely used as its converter capacity is small. However, the low voltage ride through (LVRT) of DFIG is still a problem. This paper proposed a new LVRT controller based on the philosophy of current compensation. First, base on the Laplace Transform, this paper analyzes the rotor and stator current transients under the grid fault, focused on the influence of the stator DC flux. And then, it proposes a combination control strategy consisting of current compensation control and DC crowbar control improve the LVRT of DFIG. The simulation with the RTDS verified the effectiveness of the proposed control strategy.

[1]  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..

[2]  M. S. Vicatos,et al.  Transient state analysis of a doubly-fed induction generator under three phase short circuit , 1991 .

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

[4]  T. Thiringer,et al.  Evaluation of current control methods for wind turbines using doubly-fed induction machines , 2005, IEEE Transactions on Power Electronics.

[5]  Adel Nasiri,et al.  A dynamic LVRT solution for Doubly-Fed Induction Generator , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

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

[7]  Tianshu Bi,et al.  RTDS Based Maximal Power Point Tracking Simulation for Doubly-Fed Induction Generator , 2009, 2009 International Conference on Energy and Environment Technology.

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

[9]  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.

[10]  A. Nasiri,et al.  A Dynamic LVRT Solution for Doubly Fed Induction Generators , 2010, IEEE Transactions on Power Electronics.

[11]  I. Erlich,et al.  Dynamic Behavior of DFIG-Based Wind Turbines during Grid Faults , 2007, 2007 Power Conversion Conference - Nagoya.

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