【作者】 李杰；

【导师】 郭家虎；

【作者基本信息】 安徽理工大学 ， 电力电子与电力传动， 2011， 硕士

【摘要】 随着能源的巨大消耗和环境的严重污染,风能成为世界各国普遍重视的可再生能源,风力发电已经成为一种新兴的重要发电形式。风力发电技术的成熟和完善使得海上风力发电已逐渐成为风电发展的新领域。在我国,相对于陆地风能,海上风能有其独特的优势,因此海上风力发电将会成为我国电力能源结构的重要组成部分。但我国的海上风力发电技术目前才刚刚起步,研究海上风电场的电网接入技术,对我国的能源战略具有重大意义。随着电力电子技术的发展和换流技术的革新,直流输电重新回到人们的视野,也得到广泛的应用。特别是以电压源换流器为基础的轻型直流输电的出现,更使得直流输电迈向了新的高度。对于海上风电场的接入电网来说,轻型直流输电相比于传统直流输电更显优势,因此采用轻型直流输电的海上风电场的电网接入系统是本文研究的重点。本文首先研究了海上风电场的风力发电系统以及电网接入的两种方法,重点介绍了轻型直流输电系统的数学模型以及控制策略；其次建立了海上风电场的轻型直流输电模型,在此模型基础上利用了PSCAD/EMTDC仿真软件进行了稳态仿真研究和短路故障仿真研究；最后我们对海上风电场的轻型直流输电的电能损耗以及无功电压进行了计算。更多还原

【Abstract】 With the huge energy consumption and serious environmental pollution, wind power as a renewable energy has already become one kind of emerging and important electricity generation form. The maturity and improvement of wind power technology made that the offshore wind power generation has gradually become a new field of wind power development. In China, compared to land wind energy, offshore wind energy has its unique advantages, so the offshore wind power will become an important part of the energy structure. However, China’s offshore wind power technology is only just beginning, and researching the grid access technology about offshore wind farm has great significance for China’s energy strategy.With the power electronics technology development and converter technology innovation, DC transmission has return back to people’s vision, and has been widely used. Especially the HVDC based Voltage Source Converter (VSC) appears, it makes DC transmission into a new level. For the offshore wind farm access to the grid, the VSC-HVDC transmission has more advantages than the traditional HVDC transmission, so the VSC-HVDC for offshore wind farm grid access system is the focus of this paper.This paper firstly researches the offshore wind farm’s wind power system and two methods of grid access technology, it is emphatically introduced about the VSC-HVDC system’s mathematics model and control strategy; secondly makes the VSC-HVDC model about offshore wind farm, based on this model uses the PSCAD/EMTDC simulation software to researches the steady state and short-circuit fault simulation; Finally, the power loss and reactive voltage of the VSC-HVDC about offshore wind farm were calculated.更多还原