【作者】 宋宗峰；

【导师】 杨俊华；

【作者基本信息】 广东工业大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 在能源消耗日益增长、环境污染日渐严重的今天,研究可替代化石能源的新型绿色可再生能源,是解决能源危机的必由之路。风力发电是目前众多绿色可再生能源中最成熟、潜力最大的新型能源之一。因为电能的储存问题,现如今投入实际运行的大中型风力发电机组都采取并网运行方式,而且并网发电可以实现规模化经济效益,但由于风能的随机性、间歇性与多变性等因素,风电并网往往对电网造成冲击,也影响电网的电能质量。这限制了大规模风力发电场的发展。为了更好的利用风力资源,更大程度的发挥其经济性,风电并网成为迫切需要解决的问题。无刷双馈电机是一种交流励磁异步化的同步电机,适用于变速恒频风力发电。分析研究了无刷双馈电机的基本工作原理、发展历史与国内外发展现状;给出无刷双馈电机在d-q坐标系下的数学模型,论述了无刷双馈电机的功率分配关系与功率流向,为无刷双馈风力发电机的分析与控制奠定了理论基础。对无刷双馈电机的运行进行了仿真。分析了自然风的特点,给出了四种自然风的数学模型,建立了简化的风速模型的Matlab仿真。利用变论域模糊控制理论构建变论域模糊控制器,进行风能最大功率跟踪,并对跟踪结果进行了分析。变论域模糊控制理论的论域可随控制要求与实际情况进行伸缩或扩展,以便更好的实现控制目标,具有更好的鲁棒性与自适应性,可应用于精确的控制领域。分析变速恒频无刷双馈风电机并网的影响因素,利用模糊控制理论与自适应控制理论,建立了无刷双馈风力发电机空载并网闭环控制器,仿真实验结果表明,该控制器能够很好地控制风电机的空载并网,使并网过程产生的冲击电流减少,实现了风力发电的柔件并网。更多还原

【Abstract】 As an indispansible factor of human development, energy plays a vital role in human life. Energy shortage restricts the economic development. With the increasing consumption of energy souces and the worsening enviroment pollution, we are obligatory to find a green renewable energe to substitute the traditional fossil energy. Wind power is the most developed and potential one of all these green renewable energy. Researching wind power technology is not only academical study, but also the requirement by our sosiety.Large wind farms have been fully developed since 1980’, because of their scaled benefits and the particular advantages in energy saving and environment protection. However, wind power is restricted as a stochastically unconstant resourse. With the enlarging of the wind farm scale, the negative effects of wind power is becoming more and more serious and turnning to be an obstacle of further development or application. As a result of this, research on grid-connected wind turbine has become an important issue.Based on colleting, analyzing, generalizing material about grid-connectting wind power system at home and abroad, this dissertation makes an intensive study of energy management and control of wind power system based on brushless double-fed machine(BDFM). The main contents of this dissertation are as follows.In this paper, the development of Brushless Duobly-Fed Motor (BDFM) is discussed. The structure characteristics and operation process of BDFM is studied. First, different types of grid-connected generator is introduced. Then the working principle, characteristic and structure of BDFM are introduced. And also, the matehmatic model of the cascaded BDFM on the d-q coordinate rotating at rotor speed and synchronous speed seperatly, with equivalent circuit of steady state. Base on the typical equivalent circuit model of BDFM, the relations of power allocation in the operating state or generating state.The emphasis is focused on grid-connected control based on the brshless doubly-fed machine. The control strategy of the brushless doubly-fed machine is discussed. In the generating state, the mathematical model of BDFM is stochastically changeble. Comparing to other type machine, the grid-connected process of the BDFM is more complex and more difficult to control. A novel dynamic fuzzy control system based on fuzzy control theory is presented in this paper.Grid-connectting wind turbine with variable propeller pitch is introduced, and the three operation state of wind turbine is give. In this thesis, four different type wind speed mathematical model is introduced and a simplyfied wind speed model is given simulinked by Matlab. Also the mathematical transmission system of wind turbine is given.One the base of research of structure and operation principle in chapter 2 to chapter 4 the whole simulation system is established by Matlab. The purpose is to control the no-load grid-connectting wind power system by the rotational speed closed-loop. The dual converter is designed to satisfy the special requirements of the system. The simulation results are analysised to prove this control system could manage to connect the wind power system to grid safely and smoothly.At the end of this dissertation, the main research is summarized. It makes out the points of innovation and main research results, also the further researches are pointed out.更多还原