风力发电机组电液比例变桨距控制系统的研究
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摘要
自70年代以来,风能作为可再生清洁能源,得到世界各国的普遍关注。随着风力发电应用的日益广泛,风力发电技术日新月异。本文基于国家863工程建设项目“风力发电机组变桨距控制系统的研究”课题,对变桨距液压控制系统部分进行研究。
     全文分六章阐述:
     第一章绪论,首先综述了国内外风力发电机组技术的现状、发展趋势。阐述了开发国内风力发电机组技术的必要性和本课题的研究意义,并提出了本论文的主要研究内容。
     第二章,在简介风力发电机组的基础理论和工作原理的基础上,提出了变桨距控制理论的依据。在分析风力发电机组的运行规律和运行工况的前提下,进而提出了风力发电机组变桨距运行的模式设计和控制系统以及机构设计方案,并介绍了变桨距液压控制系统的工作原理。
     第三章,阐述了风力发电机组变桨距液压控制系统的设计计算方法,包括桨叶变距驱动力和液压系统的负载计算方法、液压系统的设计计算和元件选型、制动机构的设计、变桨距机械执行机构的设计,并提出了关于液压控制系统中的关键元件的并行冗余设计思想和方案。
     第四章,本章简介了采用Matlab/Simulink工具箱进行液压系统时域仿真的方法;基于Matlab/Simulink的液压系统仿真方法,结合DSH液压元件算法库对所设计的液压控制系统进行建模,从理论上对液压控制系统的动态特性进行了分析研究。
     第五章,本章简介了所搭建的“能源机械电液控制系统物理数字综合仿真实验台”的电液控制和检测系统;基于比例方向阀的动态特性试验,对比例方向阀系统进行了辨识,得出其辨识模型,为系统仿真奠定了良好的基础;最后对“风力发电机组变桨距液压控制系统”进行了开环和闭环特性试验研究;试验结果验证了系统设计的正确性和仿真模型的合理性。
     第六章,全面总结本课题的工作,展望后续的研究内容。
As a kind of renewable sources of energy, wind energy is utilized increasingly to a great extend. Since 70's,wind energy is utilized mainly in wind turbine, so every country in world pay more and more attention to research of wind turbine. The thesis is derived from the project of the National 985 Engineering Construction "Research of pitched-control system of wind turbine set". In this thesis, the author research mainly the part of hydraulic control system of pitched-control system .
    The thesis includes six chapters:
    In chapter l,the background of this project was presented and the author first overviewed the tendency , development situation and the current research of wind turbine set in domain and oversea, then put forward the necessary of the technology development of wind turbine set. Meanwhile, the author represented the meaning of the project and put forward the main objective of this research project.
    In chapter 2,the author introduced some basic theory and operating principle of wind turbine, and put forward the foundation theory of pitched-control. In this chapter, operation regular and operation state of wind turbine were analyzed. Based on the analyse, the model design the scheme of control system and machanism design were put forward. The author represented the operation principle of the pitched-control hydraulic system in the end of this chapter.
    In chapter 3,the author introduced the calculation method of the hydraulic system of the pitched-control wind turbine, including pitching blade's driving force and the load of hydraulic system. In this chapter, the design of hydraulic system actuating mechanism and braking mechanism were put forward. In the end the author suggested parallel redundancy design and programme of the proportion direction valve
    In chapter 4,the author first introduced how to use the tool box of Matlab/Simulink to establish model of hydraulic system, then established the model of the hydraulic system designed combining algorithms library in DSH.
    In chapter 5,the author introduced the test platform for this project firstly. Based on some experimental results, the identification model of the proportion direction valve was obtained. In the end, the author studied the system designed from
    In chapter 6,all of achievements of the thesis are summarized and the further research work, which will be done, is put forward.
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