摘要
低频输电技术在中远海域的海上风电项目中具备竞争力,并有望在未来得到广泛应用。首先基于低频输电技术原理,对低频输电技术(LFAC)在海上风电应用的适应性进行了分析,表明低频输电方案在海上风电项目中不存在障碍,但仍需进一步优化低频风电机组、交交变频器等关键设备。其次,通过对比分析高压交流、柔性直流与低频输电3种方案在全生命周期成本方面的差异,发现当下低频输电因其适度的初始投入成本、运行成本与废弃成本,较高故障成本与低维护成本而在离岸距离75~300 km的中远海域具有明显经济优势。然后,参照工频交直流输电可靠性评估方法,低频输电方案可靠性需按不同模块分别进行评估,通过比较低频输电方案较其他方案在可靠性评估中的差异,表明风电机组、集电系统与输电线缆的可靠性差异来源于低频运行状态或低频设备的规格差异,而海上平台可靠性差异来源于电气设备链接方式与结构差异。最后,就低频输电技术在技术性、经济性、可靠性、风险性以及环境影响方面的未来研究提出展望。本研究旨在补充低频输电技术的理论研究基础,为低频输电技术在海上风电项目中广泛铺开做好理论准备。
Low-frequency transmission technology is competitive in offshore wind power projects in the middle and far sea areas,and is expected to be widely used in the future.Based on the principle of low-frequency transmission technology,this paper firstly analyzes the adaptability of low-frequency transmission technology in offshore wind power applications,indicating that low-frequency transmission schemes do not have obstacles in offshore wind power projects,but the low-frequency wind turbines,AC-AC inverters and other key equipment need to be further optimized.Secondly,by comparing and analyzing the differences in the whole life cycle cost of high-voltage AC,flexible DC and low-frequency transmission schemes,it is found that the current low-frequency transmission has obvious economic advantages in the middle and far sea areas with an offshore distance of 75~300 km due to its moderate initial investment,operation cost and disposal cost,high failure cost and low maintenance cost.Then,referring to the reliability evaluation method for power frequency AC/DC transmission,the reliability of low-frequency transmission schemes needs to be evaluated separately according to different modules.By comparing the differences between the low-frequency transmission scheme and other schemes in the reliability evaluation,it is shown that the reliability differences between wind turbines,collector systems and transmission cables come from the differences in the low-frequency operation state or the specifications of the low-frequency equipment,while the reliability differences of offshore platforms come from the differences in the connection mode and structure of electrical equipment.Finally,the future research prospects of low-frequency transmission technology in terms of technology,economy,reliability,risk and environmental impact are proposed.The purpose of this study is to supplement the theoretical research basis of low-frequency transmission technology,and make theoretical preparation for the wide spread of low-frequency transmission
作者
齐磊
李志川
孙兆恒
支光凝
杨季平
郑旺
陈娟
QI Lei;LI Zhichuan;SUN Zhaoheng;ZHI Guangning;YANG Jiping;ZHENG Wang;CHEN Juan(CNOOC Energy Development Clean Energy Company,Tianjin 300459,China;Department of Economics and Management,North China Electric Power University,Baoding,Hebei 071000,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2024年第2期195-204,共10页
China Offshore Oil and Gas
关键词
海上风电
低频输电技术(LFAC)
并网技术
经济性
可靠性
研究现状
展望
offshore wind power
low-frequency transmission(LFAC)
grid integration
technology
economy
reliability
research status
prospect
