Research status and prospect of offshore wind power low-frequency transmission and grid integration technology
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 technology in offshore wind power projects.
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