基于模块化多电平矩阵换流器的海上风电分频系统经济性分析
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摘要
以远距离、大容量海上风电场并网为背景,综合对比海上高压直流(high-voltage DC,HVDC)输电系统与分频输电系统(fractional frequency transmission system,FFTS)的经济性,旨在为远距离、大容量海上风电并网提供一种技术上可行、经济上合理的新型参考技术解决方案。首先,对比分析海上风电HVDC输电系统与FFTS各主要设备;其次,以现有设备成本为基础,运用现金流折现模型方法分析对比基于模块化多电平技术(modularized multilevel converter,MMC)的海上HVDC输电系统和模块化多电平矩阵变换技术(Modular multilevel matrix converter,M3C)海上FFTS的经济性,并考虑系统投入一次成本、维护成本及设备损耗,最终得出了海上HVDC输电系统和海上FFTS经济临界距离,其约为离岸125km。
Taking the large-capacity and long-distance offshore wind farm as the research background,this paper comprehensively compares the economy of the offshore high-voltage DC(HVDC)transmission system and the fractional frequency transmission system(FFTS),and aims to provide a feasible and economically reasonable new reference technology solution for long-distance and large capacity offshore wind power integration.Firstly,through the analysis of the main equipment,the HVDC transmission system and the FFTS are compared.Secondly,based on the existing equipment cost,the discounted cash flow model method is used to analyze and compare the economy between modular multilevel converter(MMC)-based offshore HVDC transmission system and modular multilevel matrix converter(M3 C)-based offshore transmission system,with considering the system investment costs,maintenance costs and equipment loss.Finally,it is concluded that the critical economic distance between the offshore HVDC transmission system and the offshore FFTS is approximately 125 km offshore.
Taking the large-capacity and long-distance offshore wind farm as the research background,this paper comprehensively compares the economy of the offshore high-voltage DC(HVDC)transmission system and the fractional frequency transmission system(FFTS),and aims to provide a feasible and economically reasonable new reference technology solution for long-distance and large capacity offshore wind power integration.Firstly,through the analysis of the main equipment,the HVDC transmission system and the FFTS are compared.Secondly,based on the existing equipment cost,the discounted cash flow model method is used to analyze and compare the economy between modular multilevel converter(MMC)-based offshore HVDC transmission system and modular multilevel matrix converter(M3 C)-based offshore transmission system,with considering the system investment costs,maintenance costs and equipment loss.Finally,it is concluded that the critical economic distance between the offshore HVDC transmission system and the offshore FFTS is approximately 125 km offshore.
引文
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[16]曹京荥.基于LCC近海风电场高压交流XLPE绝缘海底电缆选型的优化研究[D].广州:华南理工大学,2015.CAO Jingying.Optimization study of high voltage XLPE AC insulation submarine cable for offshore wind farm by LCC[D].Guangzhou:South China University of Technology,2015.
[17]梁柱强.百兆伏安级静止同步补偿装置关键技术及工程应用[D].广州:华南理工大学,2015.LIANG Zhuqiang.Study on the key technologies of hundreds MVA STATCOM and its applications[D].Guangzhou:South China University of Technology,2015.
[2]仇卫东,胡君慧,李琰.大型海上风电场并网过电压问题及抑制措施研究[J].分布式能源,2016,1(3):23-28.QIU Weidong,HU Junhui,LI Yan.Grid access overvoltage and restrain measures for large-scale offshore wind farm[J].Distributed Energy,2016,1(3):23-28.
[3]王锡凡,王秀丽,滕予非.分频输电系统及其应用[J].中国电机工程学报,2012,32(13):1-6.WANG Xifan,WANG Xiuli,TENG Yufei.Fractional frequency transmission system and its applications[J].Proceedings of the CSEE,2012,32(13):1-6.
[4]LIM F N,FLEMING R J,NAYBOUR R D.Space charge accumulation in power cable XLPE insulation[J].IEEE Transactions on Dielectrics&Electrical Insulation,1999,6(3):273-281.
[5]王锡凡.分频输电系统[J].中国电力,1995,28(1):2.WANG Xifan.Fractional frequency power transmission system[J].Electric Power,1995,28(1):2.
[6]KORN A J,WINKELNKEMPER M,STEIMER P,et al.Direct modular multi-level converter for gearless low-speed drives[C]//European Conference on Power Electronics and Applications,Birmingham,United Kingdom,2011.
[7]王锡凡,刘沈全,宋卓彦,等.分频海上风电系统的技术经济分析[J].电力系统自动化,2015,39(3):43-50.WANG Xifan,LIU Shenquan,SONG Zhuoyan,et al.Technical and economical analysis on offshore wind power system integrated via fractional frequency[J].Automation of Electric Power Systems,2015,39(3):43-50.
[8]WYLLIE P B,TANG Y,RAN L,et al.Low frequency AC transmission-elements of a design for wind farm connection[C]//IET International Conference on AC and DC Power Transmission,Birmingham,United Kingdom,2015.
[9]QIN N,YOU S,XU Z,et al.Offshore wind farm connection with low frequency AC transmission technology[C]//Power&Energy Society General Meeting,Calgary,AB,Canada,2009.
[10]迟方德,王锡凡,王秀丽.风电经分频输电装置接入系统研究[J].电力系统自动化,2008,32(4):59-63.CHI Fangde,WANG Xifan,WANG Xiuli.A new wind power grid connection method based on fractional frequency transmission system[J].Automation of Electric Power Systems,2008,32(4):59-63.
[11]刘传彝.电力变压器设计计算方法与实践[M].沈阳:辽宁科学技术出版社,2002.
[12]马国栋.电线电缆载流量[M].北京:人民教育出版社,2013.
[13]4COffshore.Global tech I[EB/OL].(2017-12-31)[2018-01-10].http://www.4coffshore.com/windfarms/global-tech-igermany-de09.html.
[14]程斌杰,徐政,宣耀伟,等.海底交直流电缆输电系统经济性比较[J].电力建设,2014,35(12):59-63.CHENG Binjie,XU Zheng,XUAN Yaowei,et al.Economic comparison of AC/DC power transmission system for submarine cables[J].Electric Power Construction,2014,35(12):59-63.
[15]4COffshore.Sylwin(1)alph[EB/OL].[2018-01-10].http://www.4coffshore.com/windfarms/transmission-sylwin-(1)-alphato-b%C3%BCttel-tcid8.html.
[16]曹京荥.基于LCC近海风电场高压交流XLPE绝缘海底电缆选型的优化研究[D].广州:华南理工大学,2015.CAO Jingying.Optimization study of high voltage XLPE AC insulation submarine cable for offshore wind farm by LCC[D].Guangzhou:South China University of Technology,2015.
[17]梁柱强.百兆伏安级静止同步补偿装置关键技术及工程应用[D].广州:华南理工大学,2015.LIANG Zhuqiang.Study on the key technologies of hundreds MVA STATCOM and its applications[D].Guangzhou:South China University of Technology,2015.