双馈风力发电机设计与研究毕业设计论文.doc

双馈风力发电机设计与研究 摘要 目前，我国能源面临最突出的矛盾是国内优质能源供应不足，为减少我国对石油和天然气进口的依赖，大力发展可再生能源是解决问题的关键，而风力发电是可再生能源技术发展的重点。风力发电作为一种已获得商业化利用并具有较大潜能的可再生能源开发形式，近年来在我国得到了较快的发展。 在双馈风力发电机组中多采用矢量控制对双馈风力发电机转速进行控制，为了给矢量控制提供更精确地电机参数，提高矢量控制的效果，本文提出基于发电机小值电压跌落状态，对电机内部参数进行辨识的方法。采用递推最小二乘法对电机参数进行在线辨识。并将这种参数辨识方法与异步电机矢量控制系统相结合，构成了采用参数辨识的异步电机矢量控制系统，并利用Matlab／Simulink软件进行仿真实验，仿真结果表明参数辨识算法是有效的，明显改善了异步电机矢量控制系统的性能。在分析永磁同步电机数学模型的基础上，把最小二乘法运用在永磁同步电机参数辨识上，这种基于最小二乘法参数辨识方法是在转子同步旋转坐标系下进行的，通过Matlab／Simulink对基于最小二乘法的永磁同步电机参数辨识进行了仿真，仿真结果表明这种电机参数辨识方法能够实时、准确地更新电机控制参数。 关键词：双馈风力发电机； 电压跌落； 参数计算；电流分量 Abstract At present, our country the sources of energy are the most outstanding contradiction is the quality of the domestic shortage of energy supply, to reduce the oil and natural gas import dependence, vigorously develop renewable energy sources is the key to solve the problem, while the wind power is a renewable energy technology development focus. Wind power as a kind of have a commercial use and has large potential of renewable energy development, China in recent years has been rapid development. In the double-fed wind turbine most adopted vector control for doubly fed wind generator speed control, In order to provide a more accurate vector control motor parameters and improving the effectiveness of vector control; It is both a theoretic and a practical project．This paper focuses on the parameters estimation of asynchronous motor and a permanent magnet synchronous motor.First of all，the paper summarizes the course of high performance control strategyfor AC motor．Then，the factors which affect the parameters of the AC motor are described．The static and dynamic control performance of AC motor are affected by the change of parameters．And then，some common identification methods are analyzed，such as，model reference adaptive algorithm，least—squares algorithm，kalman filter algorithm． Key words: Wind generator; Voltage drop; Parameters calculation; Current components目录 1.引言 1 1.1国内外风力发电的状况 1 1.1.1国外