A modular series connected converter structure suitable for a high-voltage direct current transformerless offshore wind turbine

ABSTRACTA modular generator/converter system suitable for a 100 kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations...

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Published inWind energy (Chichester, England) Vol. 17; no. 12; pp. 1855 - 1874
Main Authors Gjerde, S., Ljøkelsøy, K., Nilsen, R., Undeland, T.
Format Journal Article
LanguageEnglish
Published Bognor Regis Blackwell Publishing Ltd 01.12.2014
John Wiley & Sons, Inc
Subjects
DC grid
modular power electronic converter
offshore wind power
transformerless
transformerless, DC grid
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Abstract ABSTRACTA modular generator/converter system suitable for a 100 kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations is analyzed. A steady‐state model relating these variations to the imbalances between module DC voltages has been developed. Additionally, the impact of different control strategies was assessed through simulations in EMTDC/PSCAD. Finally, experimental verification of the system performed on a 45 kW laboratory prototype is presented. The theory is developed with the transformerless wind turbine concept in mind but is also applicable to other similar series connected converter topologies.Copyright © 2013 John Wiley & Sons, Ltd.
AbstractList A modular generator/converter system suitable for a 100kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations is analyzed. A steady-state model relating these variations to the imbalances between module DC voltages has been developed. Additionally, the impact of different control strategies was assessed through simulations in EMTDC/PSCAD. Finally, experimental verification of the system performed on a 45kW laboratory prototype is presented. The theory is developed with the transformerless wind turbine concept in mind but is also applicable to other similar series connected converter topologies.Copyright copyright 2013 John Wiley & Sons, Ltd.
A modular generator/converter system suitable for a 100kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations is analyzed. A steady-state model relating these variations to the imbalances between module DC voltages has been developed. Additionally, the impact of different control strategies was assessed through simulations in EMTDC/PSCAD. Finally, experimental verification of the system performed on a 45kW laboratory prototype is presented. The theory is developed with the transformerless wind turbine concept in mind but is also applicable to other similar series connected converter topologies.Copyright © 2013 John Wiley & Sons, Ltd.
ABSTRACTA modular generator/converter system suitable for a 100 kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations is analyzed. A steady‐state model relating these variations to the imbalances between module DC voltages has been developed. Additionally, the impact of different control strategies was assessed through simulations in EMTDC/PSCAD. Finally, experimental verification of the system performed on a 45 kW laboratory prototype is presented. The theory is developed with the transformerless wind turbine concept in mind but is also applicable to other similar series connected converter topologies.Copyright © 2013 John Wiley & Sons, Ltd.
Author Gjerde, S.
Nilsen, R.
Undeland, T.
Ljøkelsøy, K.
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  email: Correspondence: S. Gjerde, Ph.D.-student, Dep. of Electric Power Engineering, Norwegian University of Science and Technology., sverre.gjerde@ntnu.no
  organization: Norwegian University of Science and Technology, 7491 Trondheim, Norway
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  organization: Norwegian University of Science and Technology, 7491 Trondheim, Norway
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References Ng C, Parker M, Ran L, Tavner P, Bumby J, Spooner E. A multilevel modular converter for a large, light weight wind turbine generator. IEEE Transactions on Power Electronics 2008; 23: 1062-1074. DOI: 10.1109/TPEL.2008.921191.
Holtsmark N, Bahirat H, Molinas M, Mork B, Hoidalen H. An all-DC offshore wind farm with series-connected turbines: an alternative to the classical parallel AC model? IEEE Transactions on Industrial electronics 2013; 60: 2420-2428. DOI: 10.1109/TIE.2012.2232255.
Spooner E, Gordon P, Bumby J, French C. Lightweight ironless-stator PM generators for direct-drive wind turbines. IEE Proceedings - Electric Power Applications 2005; 152: 17-26. DOI: 10.1049/ip-epa:20041084.
Parker M, Ran L, Finney S. Distributed control of a fault-tolerant modular multilevel inverter for direct-drive wind turbine grid interfacing. IEEE Transactions on Industrial Electronics 2013; 60: 509-522. DOI: 10.1109/TIE.2012.2186774.
Yuan X, Chai J, Li Y. A transformer-less high-power converter for large permanent magnet wind generator systems. IEEE Transactions on Sustainable Energy 2012; 3: 318-329. DOI: 10.1109/TSTE.2012.2184806.
Max L, Thiringer T, Carlson O. Fault handling for a wind farm with an internal DC collection grid. Wind Energy 2012; 15: 259-273. DOI: 10.1002/we.466. [Online]. Available: http://dx.doi.org/10.1002/we.466. (Accessed 21 June 2013).
O'Donnell R, Schofield N, Smith A, Cullen J. Design concepts for high-voltage variable-capacitance DC generators. IEEE Transactions on Industry Applications 2009; 45: 1778-1784. DOI: 10.1109/TIA.2009.2027545.
Max L, Thiringer T, Carlson O. Control of a wind farm with an internal direct current collection grid. Wind Energy 2012; 15: 547-561. DOI: 10.1002/we.486. [Online]. Available: http://dx.doi.org/10.1002/we.486. (Accessed 21 June 2013).
Abad G, Lopez J, Rodriguez M, Marroyo L, Iwanski G. Doubly Fed Induction Machine: Modeling and Control for Wind Energy Generation Applications. Wiley-IEEE Press: Hoboken, New Jersey, 2011.
Karlsson P, Svensson J. DC bus voltage control for a distributed power system. IEEE Transactions on Power Electronics 2003; 18: 1405-1412. DOI: 10.1109/TPEL.2003.818872.
Mueller MA, McDonald AS. A lightweight low-speed permanent magnet electrical generator for direct-drive wind turbines. Wind Energy 2009; 12: 768-780. DOI: 10.1002/we.333. [Online]. Available: http://dx.doi.org/10.1002/we.333 (Accessed 21 June 2013).
Emadi A, Khaligh A, Rivetta C, Williamson G. Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronic converters and motor drives. IEEE Transactions on Vehicular Technology 2006; 55: 1112-1125. DOI: 10.1109/TVT.2006.877483.
Chinchilla M, Arnaltes S, Burgos J. Control of permanent-magnet generators pplied to variable-speed wind-energy systems connected to the grid. IEEE Transactions on Energy Conversion 2006; 21: 130-135. DOI: 10.1109/TEC.2005.853735.
Popat M, Wu B, Liu F, Zargari N. Coordinated control of cascaded current-source converter based offshore wind farm. IEEE Transactions on Sustainable Energy 2012; 3: 557-565. DOI: 10.1109/TSTE.2012.2191986.
Garces A, Molinas M. Coordinated control of series-connected offshore wind park based on matrix converters. Wind Energy 2012; 15: 827-845. DOI: 10.1002/we.507. [Online]. Available: http://dx.doi.org/10.1002/we.507. (Accessed 21 June 2013).
Jamieson P. Upscaling of Wind Turbine Systems. John Wiley & Sons, Ltd: Chichester, UK, 2011; 75-104. [Online]. Available: http://dx.doi.org/10.1002/9781119975441.ch4. (Accessed 28 November 2012).
Parker M, Ng C, Ran L. Fault-tolerant control for a modular generator - converter scheme for direct-drive wind turbines. IEEE Transactions on Industrial Electronics 2011; 58: 305-315. DOI: 10.1109/TIE.2010.2045318.
Prasai A, Yim JS, Divan D, Bendre A, Sul SK. A new architecture for offshore wind farms. IEEE Transactions on Power Electronics 2008; 23: 1198-1204. DOI: 10.1109/TPEL.2008.921194.
Gjerde S, Undeland TM. A modular series connected converter for a 10 MW, 36 kV, transformer-less offshore wind power generator drive. Energy Procedia 2012; 24: 68-75. DOI: 10.1109/ECCE.2012.6342815. [Online]. Available: http://www.sciencedirect.com/science/article/pii/S1876610212011289. (Accessed 26 November 2012), Selected papers from Deep Sea Offshore Wind R&D Conference, Trondheim, Norway, 19-20 January 2012.
Arabian-Hoseynabadi H, Tavner PJ, Oraee H. Reliability comparison of direct-drive and geared-drive wind turbine concepts. Wind Energy 2010; 13: 62-73. DOI: 10.1002/we.357. [Online]. Available: http://dx.doi.org/10.1002/we.357. (Accessed 21 June 2013).
Negra NB, Todorovic J, Ackermann T. Loss evaluation of HVAC and HVDC transmission solutions for large offshore wind farms. Electric Power Systems Research 2006; 76: 916-927. DOI: 10.1016/j.epsr.2005.11.004. [Online]. Available: http://www.sciencedirect.com/science/article/pii/S0378779605002609. (Accessed 15 November 2012).
2009; 45
2009; 12
2012; 3
2005; 152
2010; 13
2012
2011
2000
2010
2006; 76
2006; 21
2006; 55
2009
2008
2008; 23
2013; 60
2007
2006
2003; 18
2011; 58
2012; 15
2002
2012; 24
References_xml – volume: 60
  start-page: 509
  year: 2013
  end-page: 522
  article-title: Distributed control of a fault‐tolerant modular multilevel inverter for direct‐drive wind turbine grid interfacing
  publication-title: IEEE Transactions on Industrial Electronics
– year: 2011
– volume: 60
  start-page: 2420
  year: 2013
  end-page: 2428
  article-title: An all‐DC offshore wind farm with series‐connected turbines: an alternative to the classical parallel AC model?
  publication-title: IEEE Transactions on Industrial electronics
– year: 2009
– start-page: 215
  year: 2006
  end-page: 219
– volume: 58
  start-page: 305
  year: 2011
  end-page: 315
  article-title: Fault‐tolerant control for a modular generator – converter scheme for direct‐drive wind turbines
  publication-title: IEEE Transactions on Industrial Electronics
– start-page: 1
  year: 2009
  end-page: 7
– volume: 24
  start-page: 68
  year: 2012
  end-page: 75
  article-title: A modular series connected converter for a 10 MW, 36 kV, transformer‐less offshore wind power generator drive
  publication-title: Energy Procedia
– start-page: 76
  year: 2006
  end-page: 82
– start-page: 1131
  year: 2011
  end-page: 1136
– start-page: 2104
  year: 2010
  end-page: 2110
– year: 2007
– volume: 13
  start-page: 62
  year: 2010
  end-page: 73
  article-title: Reliability comparison of direct‐drive and geared‐drive wind turbine concepts
  publication-title: Wind Energy
– year: 2000
– start-page: 247
  year: 2012
  end-page: 252
– start-page: 1101
  year: 2012
  end-page: 1106
– volume: 76
  start-page: 916
  year: 2006
  end-page: 927
  article-title: Loss evaluation of HVAC and HVDC transmission solutions for large offshore wind farms
  publication-title: Electric Power Systems Research
– year: 2010
– year: 2012
– volume: 3
  start-page: 557
  year: 2012
  end-page: 565
  article-title: Coordinated control of cascaded current‐source converter based offshore wind farm
  publication-title: IEEE Transactions on Sustainable Energy
– start-page: 75
  year: 2011
  end-page: 104
– start-page: 1
  year: 2011
  end-page: 10
– start-page: 1
  year: 2010
  end-page: 6
– start-page: 2056
  year: 2010
  end-page: 2061
– volume: 23
  start-page: 1198
  year: 2008
  end-page: 1204
  article-title: A new architecture for offshore wind farms
  publication-title: IEEE Transactions on Power Electronics
– volume: 12
  start-page: 768
  year: 2009
  end-page: 780
  article-title: A lightweight low‐speed permanent magnet electrical generator for direct‐drive wind turbines
  publication-title: Wind Energy
– start-page: 65
  year: 2006
  end-page: 68
– year: 2002
– volume: 3
  start-page: 318
  year: 2012
  end-page: 329
  article-title: A transformer‐less high‐power converter for large permanent magnet wind generator systems
  publication-title: IEEE Transactions on Sustainable Energy
– volume: 15
  start-page: 259
  year: 2012
  end-page: 273
  article-title: Fault handling for a wind farm with an internal DC collection grid
  publication-title: Wind Energy
– volume: 23
  start-page: 1062
  year: 2008
  end-page: 1074
  article-title: A multilevel modular converter for a large, light weight wind turbine generator
  publication-title: IEEE Transactions on Power Electronics
– start-page: 3167
  year: 2010
  end-page: 3172
– volume: 21
  start-page: 130
  year: 2006
  end-page: 135
  article-title: Control of permanent‐magnet generators pplied to variable‐speed wind‐energy systems connected to the grid
  publication-title: IEEE Transactions on Energy Conversion
– start-page: 253
  year: 2012
  end-page: 260
– volume: 18
  start-page: 1405
  year: 2003
  end-page: 1412
  article-title: DC bus voltage control for a distributed power system
  publication-title: IEEE Transactions on Power Electronics
– volume: 15
  start-page: 827
  year: 2012
  end-page: 845
  article-title: Coordinated control of series‐connected offshore wind park based on matrix converters
  publication-title: Wind Energy
– volume: 55
  start-page: 1112
  year: 2006
  end-page: 1125
  article-title: Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronic converters and motor drives
  publication-title: IEEE Transactions on Vehicular Technology
– start-page: 1
  year: 2009
  end-page: 10
– start-page: 2106
  year: 2008
  end-page: 2112
– volume: 15
  start-page: 547
  year: 2012
  end-page: 561
  article-title: Control of a wind farm with an internal direct current collection grid
  publication-title: Wind Energy
– volume: 152
  start-page: 17
  year: 2005
  end-page: 26
  article-title: Lightweight ironless‐stator PM generators for direct‐drive wind turbines
  publication-title: IEE Proceedings ‐ Electric Power Applications
– volume: 45
  start-page: 1778
  year: 2009
  end-page: 1784
  article-title: Design concepts for high‐voltage variable‐capacitance DC generators
  publication-title: IEEE Transactions on Industry Applications
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Snippet ABSTRACTA modular generator/converter system suitable for a 100 kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter...
A modular generator/converter system suitable for a 100kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator...
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modular power electronic converter
offshore wind power
transformerless
transformerless, DC grid
Title A modular series connected converter structure suitable for a high-voltage direct current transformerless offshore wind turbine
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