An approach to reduce the fluctuation of HVDC link current in series connected wind turbines

In the present paper the proposed topology is to improve the power quality of high voltage dc (HVDC) link current which is used for series interconnected offshore wind turbines. The series connection of wind turbines is used with dc-dc converters to build HVDC link voltage. In the present work each wind turbine is furnished with a 5 MW permanent magnet synchronous generator (PMSG) connected to ac-dc-dc converter. 150 MW wind farm is modelled and simulated using thirty units of wind generator with a rated dc link voltage of 125 kV at 1.22 kA. It is observed that the proposed topology reduces the output current fluctuation in HVDC link. The simulation has been done in MATLAB/SIMULINK environment).

[1]  Peter W. Lehn,et al.  Interconnection of Direct-Drive Wind Turbines Using a Series-Connected DC Grid , 2014, IEEE Transactions on Sustainable Energy.

[2]  Thomas Ackermann,et al.  Loss evaluation of HVAC and HVDC transmission solutions for large offshore wind farms , 2006 .

[3]  M. Molinas,et al.  A power conversion system for offshore wind parks , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[4]  Geir Moe,et al.  Status, plans and technologies for offshore wind turbines in Europe and North America , 2009 .

[5]  Peter W. Lehn,et al.  Interconnection of direct-drive wind turbines using a distributed HVDC converter station , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[6]  Junji Tamura,et al.  Operation and Control of HVDC-Connected Offshore Wind Farm , 2010, IEEE Transactions on Sustainable Energy.

[7]  Staffan Norrga,et al.  New Voltage Source Converter Topology for HVDC Grid Connection of Offshore Wind Farms , 2004 .

[8]  W.L. Kling,et al.  HVDC Connection of Offshore Wind Farms to the Transmission System , 2007, IEEE Transactions on Energy Conversion.

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

[10]  M. Liserre,et al.  Future Energy Systems: Integrating Renewable Energy Sources into the Smart Power Grid Through Industrial Electronics , 2010, IEEE Industrial Electronics Magazine.

[11]  J. K. Phipps.  A transfer function approach to harmonic filter design , 1995, Industry Applications Society 42nd Annual Petroleum and Chemical Industry Conference.