LVRT capability and improved control scheme of PMSG-based WECS during asymmetrical grid faults

Low voltage ride-through (LVRT) requirements for wind energy conversion systems (WECSs) under asymmetrical grid faults are still under discussion. In a draft code “SDLWindV” of Germany, wind energy conversion systems (WECSs) are demanded to inject positive-sequence reactive current during asymmetrical faults, which represents the future trends of LVRT requirements for asymmetrical faults. However, such new requirements are not taken into account in most of the existing LVRT control schemes. In this paper, the capability of permanent magnet synchronous generator (PMSG)-based WECSs to fulfill such new requirements is evaluated, considering the voltage and current limitations of grid-side converter (GSC).Further, based on the analysis of the LVRT capability, a control scheme is proposed for PMSG-based WECSs to satisfy the new requirements. Finally, both simulations and experimental tests are carried out to verify the proposed scheme. The achieved analysis results of asymmetrical faults ride-through capability of PMSG-based WECS will provide a guideline for the design of grid codes, and the proposed scheme is expected to help PMSG-based WECSs meet the new LVRT requirements for asymmetrical faults.

[1]  Zhe Chen,et al.  Low-voltage ride-through of variable speed wind turbines with permanent magnet synchronous generator , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[2]  Wang Zhen,et al.  Study on LVRT capability of D-PMSG based wind turbine , 2011, 2011 IEEE Power Engineering and Automation Conference.

[3]  Junji Tamura,et al.  Low voltage ride-through capability improvement of wind farms using variable speed permanent magnet wind generator , 2011, 2011 International Conference on Electrical Machines and Systems.

[4]  Mario Rizo,et al.  Low voltage ride-through of wind turbine based on interior Permanent Magnet Synchronous Generators sensorless vector controlled , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[5]  Dong-Choon Lee,et al.  Improvement of power quality for PMSG wind turbine systems , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[6]  Marco Liserre,et al.  Grid Converters for Photovoltaic and Wind Power Systems , 2011 .

[7]  H. Camblong,et al.  DFIG Power Generation Capability and Feasibility Regions Under Unbalanced Grid Voltage Conditions , 2011, IEEE Transactions on Energy Conversion.

[8]  Li Ran,et al.  Unbalanced Grid Fault Ride-Through Control for a Wind Turbine Inverter , 2007, 2007 IEEE Industry Applications Annual Meeting.

[9]  Jun Li,et al.  A novel power-flow balance LVRT control strategy for low-speed direct-drive PMSG wind generation system , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.

[10]  Donald Grahame Holmes,et al.  Stationary frame current regulation of PWM inverters with zero steady-state error , 2003 .

[11]  Geng Yang,et al.  LVRT Capability of DFIG-Based WECS Under Asymmetrical Grid Fault Condition , 2013, IEEE Transactions on Industrial Electronics.

[12]  Donald Grahame Holmes,et al.  Stationary frame current regulation of PWM inverters with zero steady state error , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[13]  Li Jianlin,et al.  Modeling on converter of direct-driven WECS and its characteristic during voltage sags , 2008, 2008 IEEE International Conference on Industrial Technology.

[14]  Xiao-ping Yang,et al.  Asymmetrical voltage dip ride-through enhancement of directly driven wind turbine with permanent magnet synchronous generator , 2009, 2009 International Conference on Sustainable Power Generation and Supply.

[15]  Jiabing Hu,et al.  Modeling and enhanced control of DFIG under unbalanced grid voltage conditions , 2009 .