DFIG-based wind energy conversion systems under unbalanced voltage dips

With the uptake of wind power increasing steadily on a global level, the grid compatibility of wind energy conversion systems (WECS) must be improved to ensure that electrical networks with a high wind penetration remain stable and reliable. For this reason WECS must now be able to remain connected to the grid during balanced and unbalanced grid faults and to provide ancillary services such as reactive power support to the grid as stipulated by the grid code requirements. Unbalanced grid voltages can have significant negative effects on the performance of wind energy conversion systems equipped with doubly-fed induction generators. These effects can decrease the lifetime of the system and in extreme cases they can lead to violation of the grid code requirements. In this paper a control strategy is presented, which minimizes torque oscillations and total active power oscillations in the DFIG that arise due to unbalanced voltage conditions in the grid.

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

[2]  M. Lehtonen,et al.  Fault rates of different types of medium voltage power lines in different environments , 2010, Proceedings of the 2010 Electric Power Quality and Supply Reliability Conference.

[3]  Math Bollen,et al.  Understanding Power Quality Problems: Voltage Sags and Interruptions , 1999 .

[4]  Constantinos Sourkounis,et al.  Review of control strategies for DFIG-based wind turbines under unsymmetrical grid faults , 2014, 2014 Ninth International Conference on Ecological Vehicles and Renewable Energies (EVER).

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

[6]  Luis Marroyo,et al.  Doubly Fed Induction Machine : Modeling and Control for Wind Energy Generation , 2011 .

[7]  Constantinos Sourkounis,et al.  Grid Code Requirements for Wind Power Integration in Europe , 2013 .

[8]  Constantinos Sourkounis,et al.  Influence of Wind-Energy-Converter Control Methods on the Output Frequency Components , 2009, IEEE Transactions on Industry Applications.

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

[10]  M.F. Conlon,et al.  Performance of a Variable Speed Double-Fed Induction Generator Wind Turbine During Network Voltage Unbalance Conditions , 2006, Proceedings of the 41st International Universities Power Engineering Conference.

[11]  Constantinos Sourkounis,et al.  Influence of Wind-Energy-Converter Control Methods on the Output Frequency Components , 2009 .

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

[13]  Marco Liserre,et al.  Overview of Multi-MW Wind Turbines and Wind Parks , 2011, IEEE Transactions on Industrial Electronics.

[14]  M.D. McCulloch,et al.  Control of doubly fed wind generators connected to the grid by asymmetric transmission lines , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[15]  Nicholas Jenkins,et al.  Integration of wind turbines on weak rural networks , 1996 .

[16]  Constantinos Sourkounis,et al.  Energy Yield and Power Fluctuation of Different Control Methods for Wind Energy Converters , 2010, 2010 IEEE Industry Applications Society Annual Meeting.

[17]  C. Sourkounis,et al.  Influences of power supply quality on electric equipment in production processes , 2013, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society.