【作者】 杨林涛；

【导师】 梅柏杉；

【作者基本信息】 上海电力学院 ， 电力系统及其自动化， 2011， 硕士

【摘要】 进入到二十一世纪可再生能源发电技术特别是风力发电技术得到了前所未有的发展,在我国沿海也有大量的海上风电场处于建设或规划之中。海上风电场的出现,使可利用的风能容量大幅度增加,其中海上风能储量约为陆地上的3倍左右。在距离海岸线较远的海上风电场中采用的传统交流并网方式遇到了很多问题,比如无功功率补偿问题。本文提出了基于DFIG的海上风力发电系统通过VSC-HVDC并网的方法,并对整体系统通过PSCAD/EMTDC进行了仿真研究。首先,文章在绪论中探讨了海上基于双馈感应电机的风电场轻型直流并网的理论意义和应用价值,对国内外轻型直流输电的发展技术现状给出了具体分析并研究了未来的发展趋势,并针对双馈电机风力发电系统和轻型直流输电系统技术做了简单分析。另外对本文在进行仿真研究时使用的软件PSCAD/EMTDC做了简单的介绍。其次,本文对双馈风力发电技术进行了详细的介绍。描述了基于双馈电机风力发电技术的特点,并对双馈感应电机发电系统进行了详细的数学模型推导,其中包括风力机、双馈电机、传动系统等。在进行详细数学模型推导的基础之上,给出了双馈感应电机的转子侧、网侧变流器的控制策略,为仿真研究奠定了理论基础。再次,本文研究了轻型直流输电系统的基本结构,在对其结构进行分析的基础上,采用建立数学模型的方法详细描述了轻型直流输电系统。通过数学模型的建立及轻型直流输电系统控制方法的分析,研究了应用于海上风电场的轻型直流输电系统的详细控制策略,从而解决了海上风电场直流输电系统的理论基础。此外,还对双馈感应发电机与轻型直流输电系统互联的协调控制做了简要的分析。最后,本文对海上风电场轻型直流输电并网系统通过PSCAD/EMTDC软件进行了仿真分析。研究了在基于基本风、渐变风、扰动风、阵风共同作用的风况下,海上风电场轻型直流输电并网系统的工作情况。另外还研究了在电网发生一些常见故障情况下,基于双馈感应电机的海上风电场轻型直流并网系统的仿真分析。更多还原

【Abstract】 With the arrival of the 21st century, renewable energy technologies, especially wind power technology has been unprecedented development. There have been a large number of offshore wind farm in coastal areas. With the appearing of offshore wind farm, the availability wind power capacity increase largely. Offshore wind power capacity is about 3 times than the capacity of land. The offshore wind farms that are far away from the coast have many problems in the traditional ways of connecting with grid through AC system, such as reactive power compensation. In this paper, the method that offshore wind power system based DFIG connecting with the grid through VSC-HVDC is studied. The simulation of the whole system is performed through PSCAD / EMTDC.First, in this paper the theory and application of offshore wind farm that constituted by DFIG connecting with grid through VSC-HVDC is discussed. The development status and trends of the VSC-HVDC technology in domestic and overseas is particular analyzed. Additional the technology of connection between the DFIG wind power generation system and VSC-HVDC is given a simple analysis. Further more, a simple introduction of the tool PSCAD / EMTDC using in the simulation is given.Secondly, the DFIG wind power generation technology is particular introduced and the characteristics of wind farm based on DFIG is described. A detailed derivation of the mathematical model for DFIG wind power farm that includes wind turbine, DFIG,transmission and so on is given. Based on derivation of the detailed mathematical model this paper gives control strategy of rotor side and grid-side converter in order to providing theoretical basis for the simulation.Again, the basic structure of VSC-HVDC system is studied in this paper. Based on the analysis of the structure, this paper using method of mathematical model gives a detailed description of VSC- HVDC system. It solves the theoretical basis of the VSC-HVDC system for offshore wind farm through analysis of VSC-HVDC mathematical model and study of system interface circuit to give control strategy of the details VSC-HVDC system. In addition, this paper gives a brief analysis for the DFIG interconnected with VSC-HVDC coordination control.Finally, the simulation and analysis for offshore wind farm connected with grid through VSC-HVDC system using software PSCAD / EMTDC is given. Then, the work of the offshore wind farm connected with grid through VSC-HVDC transmission system is studied under the action of the wind based on the basic wind, gradient wind, the wind disturbance and the gust wind. Also the simulation of the system is given in the situation of some common power grid failure.更多还原