基于PCHD双馈感应发电机的L2增益控制研究

【作者】 杨倩倩；

【导师】 原明亭；

【作者基本信息】 青岛大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 风能是重要的绿色能源之一,在能源危机与环境污染同益加剧的形势下,风力发电技术得到人们前所未有的关注。本文以变速恒频(VSCF)风力发电系统中双馈感应发电机(DFIG)的运行控制为主要内容,运用哈密顿系统理论与L2增益扰动抑制方法设计了DFIG风力发电系统的控制器,并分析了系统的稳定性。同时对所设计的系统在Matlab/Simulink的软件环境下进行仿真,仿真实验结果表明所提出的控制策略是实现了最大风能捕捉和定子有功、无功的解耦,对实际工程应用具有一定参考价值。本课题完成的主要工作集中在：(1)介绍了PCH控制方法和L2扰动抑制的理论基础,并给出了非线性系统的PCHD结构模型。(2)建立了不同坐标系下DFIG的动态数学模型,并整理得到构建了DFIG的PCH结构形式。构建了由DFIG,双向功率变换器和风轮机构成的变速恒频风力发电系统模型。并分析了双馈感应电机处于亚同步和超同步运行时(电动运行和发电运行时)的能量流动关系。(3)在PCHD结构形式下DFIG数学模型的基础上,运用状态误差PCHD控制原理和L2扰动抑制原理,设计了变速恒频风力发电系统的PCH控制器和L2增益控制器,并最终得到系统的总控制器。(4)介绍了电压空间矢量脉宽调制(SVPWM)原理,研究了传动系统的电压空间矢量脉宽调制(SVPWM)实现,并在Matlab/Simulink环境下对DFIG风电系统进行了仿真研究。仿真结果表明了该方法是可行的。最后,对本文的研究工作做了总结,对该方法的前景进行了展望,并提出了未来对该系统的研究方向。更多还原

【Abstract】 Wind power is one of the most important Green energy, in the energy crisis and growing environmental pollution situation, the wind power technology is an unprecedented paid close attention. In this paper, the main content is the operation control of doubly-fed induction generator (DFIG) which is usually used in the variable-speed-constant-frequency VSCF wind power system, Applying the Hamiltonian system theory and methods of L2-gain disturbances attenuation, the DFIG wind power system controller is designed, and the Stability of system is analyze. At the same time the design for the system is simulated in the Matlab/Simulink software simulation environment, The simulation results show that the largest wind energy capture as well as Independent reactive power regulation is achieved. It has a certain reference value for engineering application, has certain reference value.The main issues in this paper are focused on:Firstly, A PCH control method and L2 disturbance attenuation of the theoretical basis are introduced and the PCHD model of non-linear system is given.Secondly, Established the DFIG dynamic mathematical model in different coordinates system, and constructed and built up a PCH structure of the DFIG. established the wind turbines VSCF wind power system model which are Constructed by the DFIG, bi-directional power converter. And the described the super-synchrony and sub-synchrony operation of DFIG (electric power state and power state) and the relationship between the energy flows.Thirdly, under the DFIG mathematical model which is in the form of PCHD structure, using the state error PCHD control theory and the principle of L2 disturbance attenuation, designed the PCH controller and L2 controller gain of the variable speed constant frequency wind power generation system, and finally the total system controller is given.Fourthly, introduced the voltage space vector pulse width modulation (SVPWM) principle and studied achievement of the voltage space vector pulse width modulation (SVPWM)of the transmission system. And give the simulation for the DFIG wind power system in the Matlab/Simulink environment. The simulation results show that the method is feasible.Finally, the research work of this article is summarized; some study methods and future research directions of the system are put forwards.更多还原