Sun Junyang,Zhu Miao,Gao Qiang,et al．Optimal design of internal topology for high power AC offshore wind farms[j]．Power System Technology,2013,37(7)：1978-1982(in Chinese)．
[3]
Xu L,Yao L,Sasse C．Grid integration of large DFIG-based wind farms using VSC transmission[J]．IEEE Transactions on Power Systems,2007,3(22)：976-984．
Tang Guangfu,He Zhiyuan,Teng Letian,et al．New progress on HVDC technology based on voltage source converter[J]．Power System Technology,2008,32(22)：39-44(in Chinese)．
Sun Wenbo,Xu Huali,Fu Yuan,et al．Coordinated control of multi-terminal DC transmission system to send out power from large-scale wind farm[J]．Power System Technology,2013,37(6)：1596-1601(in Chinese)．
Zhang Wenliang,Tang Yong,Zeng Nanchao．Multi-terminal HVDC transmission technologies and its application prospects in China[J]．Power System Technology,2010,34(9)：1-6(in Chinese)．
[10]
Shi G,Chen Z,Cai X．Overview of multi-terminal VSC HVDC transmission for large offshore wind farms[C]//Proceedings of 2011 International Conference on Advanced Power System Automation And Protection．Beijing,China：2011 International Conference on Advanced Power System Automation and Protection,2011：1324-1329．
[11]
Meyer C,Hoing M,Peterson A,et al．Control and design of DC grids for offshore wind farms[J]．IEEE Transactions on Industry Applications,2007,43(6)：1475-1482．
[12]
Max L,Lundberg S．System efficiency of a DC/DC converter-based wind farm[J]．Wind Energy,2008(11)：109-120．
[13]
Robinson J,Jovcic D,Joo?s G．Analysis and design of an offshore wind farm using a MV DC grid[J]．IEEE Transactions on Power Delivery,2010,25(4)：2164-2173．
[14]
Deng F,Chen Z．Control of improved full-bridge three-level DC/DC converter for wind turbines in a DC grid[J]．IEEE Transactions on Power Electronics,2013,28(1)：214-324．
[15]
Deng F,Chen Z．Operation and control of a DC-grid offshore wind farm under DC transmission system faults[J]．IEEE Transactions on Power Delivery,2013,28(3)：1356-1363．
[16]
Zhan C,Smith C,Crane A,et al．DC transmission and distribution system for a large offshore wind farm[C]//9th IET International Conference on AC and DC Power Transmission．London,UK：9th IET International Conference on AC and DC Power Transmission,2010：1-5．
[17]
Holtsmark N,Bahirat H J,Molinas M,et al．An all-DC offshore wind farm with series-connected turbines：an alternative to the classical parallel AC model?[J]．IEEE Transactions on Industrial Electronics,2013,60(6)：2420-2428．
[18]
Veilleux E,Lehn P W．Interconnection of direct-drive wind turbines using a series-connected DC grid[J]．IEEE Transactions on Sustainable Energy,2014,5(1)：139-147．
[19]
Lundberg S．Configuration study of large wind parks[D]．Goteborg,Sweden：Chalmers University of Technology,2003．
[20]
Lundberg S．Wind farm configuration and energy efficiency studies - series DC versus AC layouts[D]．Goteborg,Sweden：Chalmers University of Technology,2006．
[21]
Garcés A,Molinas M．Coordinated control of series connected offshore wind park based on matrix converters[J]．Wind Energy,2012,15(6)：827-845．
He Daqing,Shi Gang,Peng Simin,et al．Analysis on the operation characteristics of series connected DC based wind farm[J]．Southern Power System Technology,2012,6(6)：100-104(in Chinese)．
He Daqing,Shi Gang,Wu Guoxiang,et al．The control strategy of DC series-type wind turbines and its simulation[J]．Southern Power System Technology,2012,6(6)：95-99(in Chinese)．
[26]
Shi G,Zhu M,Cai X,et al．Generalized average model of DC wind turbine with consideration of electromechanical transients
[27]
[C]//Proceedings of 39 th Annual Conference of the IEEE Industrial Electronics Society．Vienna,Austria：IEEE ,2013：1636-1641．
