发布时间 : 星期五 文章毕业设计-三相电压型PWM整流器的研究更新完毕开始阅读45e53d7548d7c1c708a14591
河南理工大学毕业设计
摘 要
随着社会的高速发展，电能在工农业生产和人民日常生活中发挥着起来越重要的作用，然而与之同时与国民生产生活密切相关的电力电子换流装置，如变频器、高频开关电源、逆变电源等各种换流装置在广泛的运用中给电网带来了大量的无功功率与严重的谐波污染。随着电力电子技术的发展，具有网侧电流接近正弦波、功率因数近似为1、直流侧输出电压稳定、抗负载扰动能力强并且能够在四象限运行的PWM整流器应运而生，成功地取代了不可控二极管整流器和相控的晶闸管整流器，并成为电力电子技术研究的热点。本言研究的主要对象就是应用最为广泛的三相电压型PWM整流器。
首先，本文介绍了PWM整流器研究的背景与意义，综述了PWM技术的发展及现状，引出了三相电压型PWM整流器，并分析了三相电压型PWM整流器的工作原理，并在此基础上建立了其在ABC三相静止坐标系、d-q同步旋转坐标系和?-?两相静止坐标系三个不同坐标系下的数学模型。
其次，本文对PWM整流器的电流控制策略进行了深入的研究，分析了间接电流控制和直接电流控制的优缺点，确定了采用直接电流控制，并对双闭环控制器及PWM整流器主回路参数进行了系统的设计；引入了电压空间矢量，阐述了空间电压矢量控制的控制算法。
最后，本文在理论分析的基础上，利用MTALAB提供的电力电子工具箱，在Simuink仿真环境下建立了三相VSR型PWM整流器主回路及控制器的模型并进行了仿真实验，通过对仿真结果的分析，表明了该方案能够满足网侧电流近似正弦和高功率因数的要求，验证了方案的正确性和可行性。
关键词：三相电压型PWM整流器；直接电流控制；双闭环控制；电压空间矢量PWM；Matlab仿真
河南理工大学毕业设计
ABSTRACT
With the rapid development of modern society,the power in modern industry plays an increasingly important role,but in the national production and life are closely related with the power electronic converter devices,such as the frequency converters,high-frequency switching power supplies,power inverters and other various converters the use of the device will give our power grid to bring a lot of unfavorable factors,such as a large amount of reactive power and harmonic,low power factor,or even cause severe electromagnetic pollution,resulting in the use of other equipments are not normal in same network.With the development of power electronic and PWM technology, the rectifier has the characteristics of high power factor,harmonic minor,DC output voltage stability and has operate in the four-quadrant,etc.It becomes a green power conversion device.Therefore,the main research subject of this paper is the three-phase voltage source PWM rectifier.
Firstly,the article introduces the background and significance of the PWM rectifier's research,overviews PWM technology's development history and status,raises the three-phase voltage source PWM rectifier,and analysed the working principle of three-phase voltage source PWM rectifier,on this basis established its mathematical model on ABC static coordinate system,d-q synchronous rotating reference frame and ?-? two-phase static coordinate system three different coordinate system ,in addition.
Secondly,this article researches current control strategy of PWM rectifier in depth,analyse s the shortcoming and advantage between indirect-current control and direct current control, make a decision of employment of direct current control based on fixed switching frequency,and systematic designs parameter of double closed loop controller and PWM converter main circuit parameters.Bring in Voltage Space Vector ,and overview the arithmetic of it
Finally,In the foundation of theory analysis ,using Power Electric toolbox offered by MATLAB to finish the simulation experiment under Simulink environment and to verify systematic exactness and feasibility by analysing the simulation results.
Keywords：Three-phase Voltage Source PWM Rectifiers;Direct current control;Double loop control;Space Vector PWM;dual-loop control system;Matlab simulation
河南理工大学毕业设计
目录
1 绪论 .................................................................... 1
1.1 PWM整流器研究的背景与意义 ......................................... 1 1.2 PWM整流器的产生与发展现状 ......................................... 2
1.2.1 PWM整流器的产生 ............................................. 2 1.2.1电流型PWM整流器 ............................................. 2 1.2.3电压型PWM整流器 ............................................. 3 1.2.4 PWM整流器的发展现状 ......................................... 4 1.3本课题研究的主要内容 ............................................... 5 2 三相VSR原理分析与建模 .................................................. 6
2.1 三相VSR的拓扑结构 ................................................ 6 2.2 PWM基本原理分析 ................................................... 6 2.3 三相VSR的数学模型 ................................................ 9
2.3.1 三相VSR在三相静止坐标系的数学模型 ........................... 9 2.3.2 三相VSR d-q模型的建立 ...................................... 12
3 三相VSR控制系统设计 ................................................... 17
3.1 VSR的电流控制 .................................................... 17
3.1.1 间接电流控制 ................................................ 17 3.1.2直接电流控制 ................................................ 18 3.2三相VSR双闭环控制系统的设计 ...................................... 19
3.2.1 电流内环控制系统设计 ........................................ 20 3.2.2 电压外环控制系统设计 ........................................ 23 3.2三相PWM整流器参数的设计 .......................................... 23
3.2.1 交流侧电感的设计 ............................................ 23 3.2.2 直流侧电容的设计 ............................................ 28
4 三相VSR的空间矢量控制 ................................................. 30
4.1 三相VSR空间矢量PWM 控制的基本原理 ............................... 30 4.2三相VSR空间电压矢量分布 .......................................... 30 4.3 SVPWM整流器的控制算法 ............................................ 32
4.3.1 扇区的确定 .................................................. 33
河南理工大学毕业设计
4.3.2 矢量作用时间的确定 .......................................... 33 4.3.3开关矢量的确定 .............................................. 37
5 Matlab 仿真 ............................................................ 40
5.1 基于空间电压矢量的直接电流控制的三相VSR PWM整流器的仿真 ......... 40
5.1.1 基于空间电压矢量PWM波生成模块simulink模型建立 ............. 40 5.1.2 PWM整流器的主回路及控制系统simulink模型的建立 ............. 42 5.2 PWM整流器仿真波形 ................................................ 45 6 总结与展望 ............................................................. 48 致谢 ..................................................................... 49 参考文献 ................................................................. 50