基于双PWM的双馈风力发电功率控制技术研究

发布时间：2018-03-06 01:04

本文选题：双馈式感应发电机　切入点：双PWM变流器　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来，由于传统能源的短缺以及日益严重的环境污染与气候变暖问题，风能的开发与利用越来越受到人们的重视，风力发电的市场也在迅速扩大。由于相对其他风力发电方案具有显著的优势，双馈式风力发电在风力发电市场中占据了主要地位。双馈式风力发电方案以双馈式感应发电机和变流器为核心，由于发电机定子直接并入电网，因此具有定子电流正弦程度高，发出的电能质量好的特点；变流器作为控制核心既可以控制发电机的有功功率输出，实现最大风能捕捉，还可以控制发电机的无功功率输出，参与电网的无功功率调节。本文围绕双馈发电机控制所需的双PWM变流器进行了深入研究，，双PWM变流器由网侧变流器与机侧变流器两部分构成，本文针对这两部分分别进行了控制理论分析、仿真实验验证与实验样机研制。首先对网侧变流器的控制理论进行了分析，对网侧变流器的数学模型、坐标变换方法、电流解耦方法、功率因数控制方法以及双闭环控制策略进行了数学推导与讨论，并利用Matlab对网侧变流器进行了建模与仿真分析，检验了网侧变流器控制策略的可行性。接着，对机侧变流器的控制理论进行了分析，对双馈发电机数学模型、功率特性进行了数学推导，介绍了基于定子电压定向的双馈发电机输出功率解耦控制方法，构建了机侧变流器双闭环的控制结构，讨论了双馈发电机空载状态下的并网方法，利用Matlab对双馈电机输出功率控制系统进行整体建模和仿真分析，整体模型的建立对后续的硬件实验平台搭建与控制策略的软件实现具有指导意义。最后，针对双PWM变流器，设计搭建了以IPM智能功率模块为核心的主电路，和以DSP+CPLD为控制核心的控制电路，对系统主要硬件电路及软件模块进行分析和介绍，并进行了相关实验。
[Abstract]:In recent years, due to the shortage of traditional energy and the increasingly serious problems of environmental pollution and climate warming, more and more attention has been paid to the development and utilization of wind energy. The market for wind power is also expanding rapidly. Because of its significant advantages over other wind power schemes, The doubly-fed wind power generation scheme takes the doubly-fed induction generator and converter as the core, because the generator stator is directly integrated into the power network, so it has a high sinusoidal degree of stator current. As the control core, the converter can not only control the active power output of the generator, realize the gale capture, but also control the reactive power output of the generator, and participate in the reactive power regulation of the power grid. In this paper, the double PWM converter for doubly-fed generator control is deeply studied. The double PWM converter is composed of grid-side converter and machine-side converter. The control theory of the two parts is analyzed in this paper. First, the control theory of the grid-side converter is analyzed, and the mathematical model, coordinate transformation method, current decoupling method of the grid-side converter are analyzed. The power factor control method and the double closed loop control strategy are derived and discussed, and the modeling and simulation analysis of the grid-side converter is carried out by using Matlab. The feasibility of the control strategy of the grid-side converter is tested. The control theory of machine side converter is analyzed, the mathematical model and power characteristic of doubly-fed generator are derived, and the decoupling control method of output power of doubly-fed generator based on stator voltage orientation is introduced. In this paper, the control structure of double-closed loop is constructed, and the grid-connected method of doubly-fed generator under no-load condition is discussed. The output power control system of doubly-fed generator is modeled and simulated by Matlab. The establishment of the whole model has guiding significance for the subsequent hardware experiment platform and the software implementation of the control strategy. Finally, the main circuit with IPM intelligent power module as the core and the control circuit with DSP CPLD as the control core are designed and built for the dual PWM converter. The main hardware circuits and software modules of the system are analyzed and introduced. Related experiments were carried out.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315

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