【作者】 王世涛；

【导师】 张惠娟；

【作者基本信息】 河北工业大学 ， 电气工程， 2011， 硕士

【摘要】 随着世界能源日益紧缺,可再生能源已经得到了广泛的重视,而风能作为一种具有较大潜能的可再生能源开发形式在众多清洁能源中得到了较快的发展。风力发电技术已经成为世界各国学者研究的热点。本文围绕变速恒频双馈风力发电系统双PWM变流器控制技术展开。研究了双馈感应发电机(DFIG)和双PWM变流器的基本原理,分析了双馈感应发电机在三相ABC静止坐标系下的数学模型,并根据坐标变换原理,推导出两相d-q旋转坐标系下双馈电机的数学模型;分析了双PWM变流器的基本拓扑结构和运行原理,为建立系统的仿真模型奠定理论基础;根据网侧PWM变流器的基本拓扑结构,建立了数学模型,依据网侧变流器的控制目标,采用了电网电压定向矢量控制策略,根据控制策略的双闭环控制结构,设计出控制电路PI参数整定方法,采用了空间矢量脉宽调制(SVPWM),实现了对网侧变流器的控制,最后用MATLAB/Simlink搭建仿真模型,验证了控制策略的正确性;运用定子磁链定向控制理论和双馈电机d ? q坐标系下的数学模型,设计出转子侧PWM变流器的控制策略,根据控制策略的双闭环控制结构,给出了电流内环和电压外环的PI参数整定计算方法,采用u ?ω型定子磁链观测器,实现了磁链的准确的测量,最后用MATLAB/Simlink搭建仿真模型,仿真结果验证了控制策略的正确性;在网侧PWM变流器和机侧PWM变流器仿真研究基础之上,将网侧与机侧连接构成完整的大系统,对整个系统进行仿真研究。仿真结果表明本文给出的控制策略和参数整定方法能够使双馈异步电机能快速跟随风速变化,满足了网侧和机侧控制目标,实现了变速恒频运行条件,验证了整个系统设计的正确性。更多还原

【Abstract】 With the increasing scarcity of the energy in the world, renewable energy has been attached great importance widely. As one kind of clean energy ,wind energy has great potential and has been developed rapidly. Wind power technology has become a research hotspot among scholars around the world. Focusing on variable speed constant frequency (VSCF) doubly fed wind power generation system dual PWM converter control technology ,the paper is written as follow.Firstly, basic principles of VSCF double-fed generator and dual PWM converter are studied, and Doubly Fed Induction Generator (DFIG) mathematical model basing on ABC three-phase stationary coordinate system is analyzed. Base on tne coordinate transformation principle, the DFIG mathematical model basing on d-q coordinate is derived, and the base topology and operating principle of dual PWM coveter is analyzed.it establish the theoretical foundation of creating the system simulation model.Moreover, according to the basic structure of PWM Grid Side Converter (GSC), a mathematical model has been established. The voltage oriented control scheme is utilized to meet the goal of GSC that it is controllable. And then the double close loop control provides the setting of PI controller utilizing the space vector pulse-width modulation. Finally, a demonstration of the control scheme has been shown by MATLAB/Simlink.In addition, a stator flux oriented control theory and DFIG mathematical model basing on d-q coordinate is employed to design the Rotor Side Converter control scheme. A discussion of double close loop adjustor contributes to both close and open loop of the PI setting using a u-w model stator flux monitor. Next, this process has been proved by MATLAB/Simlink.Lastly, based on the study of both GSC and RSC, both of two side is connected,the whole simulation of this system is built by MATLAB/Simlink. The results show the DFIG performs as the wind speed changing which is meet the requirement of GSC and RSC. Therefore, this is the condition of variable speed constant frequency and it proves the correctness of the system designed.更多还原