柔性直流输电技术在海上风电中的应用研究

Research on Application of VSC-HVDC Technology in Offshore Wind Power

海上风资源丰富,年利用小时数高。因此,开发海上风力发电成为风力发电的大趋势。对国内外海上风电发展现状进行分析,从海上风电系统的整体结构出发,介绍了风电机组的发展。综述了海底集电系统的工作方式及其对应的多种结构,指出柔性直流输电(VSC-HVDC)技术在海上风电系统电能传输中应用的必要性。阐述了当前柔性直流送出工程中采用海上换流站集中换流方式存在的问题。将VSC-HVDC与传统的交直流输电技术进行了比较,提出了不同情况下的最佳输电选择。讨论了VSC-HVDC系统的核心部分———电压源换流器的选取,指出当前VSC-HVDC在海上风电并网中尚需解决的问题,并提出今后的研究方向与解决措施。展望了海上风电的未来发展趋势,为VSC-HVDC技术在海上风电中的发展和应用提供技术支持。

The offshore wind resources are abundant and the annual utilization hours are high.Therefore,the development of offshore wind power generation has become the trend of wind power generation.The development status of offshore wind power at home and abroad are analyzed,and the development of wind power units is introduced from the perspective of the overall structure of offshore wind power system,including installed water depth,offshore distance,etc.The working mode and corresponding structure of the submarine collector system are summarized and the necessity of the application of voltage source converter based high voltage direct current(VSC-HVDC)technology in the power transmission of offshore wind power system is pointed out.The problems existing in the centralized converter mode of offshore converter station in the current flexible DC delivery project are expounded.The VSC-HVDC technology is compared with the traditional AC-DC transmission technology,and the optimal transmission selection under different conditions is proposed.The core part of VSC-HVDC system is discussed,the selection of voltage source inverter,points out that the current VSC-HVDC in offshore wind power grid has yet to solve the problem and put forward the future research direction and the solving measures,prospects the future development trend of offshore wind,for VSCHVDC technology development and application in offshore wind to provide technical support.