【作者】 徐乐；

【导师】 黄守道；

【作者基本信息】 湖南大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 随着工业的发展,电力紧缺及供电环境问题日益突出,利用可再生能源-风能,作为未来最重要的清洁替代能源,对于缓解能源匮乏具有非常重要的意义。而变速恒频双馈风力发电技术以其成本低、效率高等特点成为当今风力发电技术中的主流。本文首先介绍了世界各国的风电和风电技术的发展现状,分析了变速恒频风力发电系统的基本原理,通过对双馈发电机的三相静止坐标系数学模型和两相旋转坐标系数学模型的研究,提出了基于定子磁场定向的矢量控制策略。并在Matlab/Simulink平台下进行了仿真,仿真结果证明了模型和控制策略的正确性。接着对作为双馈发电机励磁电源的双PWM变换器的拓扑结构及基本原理进行了深入研究,建立了三相PWM电压源型变换器的数学模型,研究了带电流耦合、电网电压前馈补偿的控制策略,并通过仿真验证了双PWM变频器具有输入输出特性好、谐波少、能量可双向流动等特点。最后,在仿真基础上设计了一套基于DSP的双馈风电模拟系统,系统采用一台2.2kW的绕线式异步电机做发电机,使用双DSP分别控制网侧和转子侧变换器,论文详细介绍了电压电流信号检测电路、通讯接口电路、正交编码脉冲电路和保护电路的设计,并给出了控制程序的主要流程。更多还原

【Abstract】 With the lack of general energy resource, electric power and the worsening of power supply circumstance problems increasingly, it is provided with very important meanings to partially solve energy lack by using renewable energy resource such as wind energy as the one of the most important clear substituted energy resource in the future. Doubly-fed induction generator (DFIG) is an attractive and booming approach that provides the ability of variable speed constant frequency wind power generation with low cost and high efficiency.At first, the current development situation about the world wind power and wind power generation technology have been introduced.After studying the mathematical model in static three-phase coordinate and in rotary two-phase coordinate, the stator field-oriented vector control strategy is issued. The results of simulation validated the validity and feasibility of model and control strategy under Matlab\Simulink。Through the analysis of the work principle and topology frame of three phases voltage resource PWM converter, set the mathematic models, study the control strategy, show that three-phase PWM converters are advantageous in high power factor, small input-line current harmonic distortion and bi-directional power flow.At last, simulating system of variable speed constant frequency wind generating is designed based on DSP and simulating.It is composed of a 2.2kW DFIG and grid-side and rotor-side converter which controlled by dual DSP controllers.The design of signal processing circuit, communications interface circuit, quadrature encoder pulse circuit and protection circuit has been detailed.更多还原