整流器的直接功率控制课件.docx

毕业论文说明书三相PWM整流器的直接功率控制仿真研究计算机与控制工程学院1205044222何子奕学生姓名： 学号：电气工程及其自动化学 院：赵俊梅专 业：指导教师：2016 年 6 月三相PWM整流器直接控制摘要随着现代工业的发展，越来越多的目光落在了变流装置上，如逆变电源和高频开关等等，这些变流装置大多都需要整流装置的配合。传统整流器中不论是使用二极管的不控整流，还是使用晶闸管的相控整流都会在电网侧产生大量的谐波电流和电压，造成低功率因数、电网运行不经济等缺点。本文在此基础上，研究一种基于PWM波的整流控制技术，它可以使得交流侧输入的电压电流实现同相位，减小网侧中的谐波成分。这种控制的实现是基于电路有功和无功功率的分析，这种技术就是直接功率控制，简称DPC。本文以电压型PWM整流器为模板，通过分析其拓扑图结构，建立了三相整流器在两相坐标系下的数学模型。通过学习和研究瞬时功率理论，在模型中加入了瞬时功率计算模块。设计两相电压比较得到输入电压的相位。根据这些模块算法建立了PWM整流系统的控制模型。最后在MATLAB的simulink中建立了PWM整流器直接功率控制的仿真模型，整个控制系统采用双闭环系统反馈控制电流相位。原理是根据所采集的瞬时功率和电压相位信号推算出此时所需的输出电压，由开关表不同开关量对应的不同输出电压来选取整流器功率开关的通断顺序。关键词：PWM，整流器，直接功率控制Direct control of three phase PWM rectifierABSTRACTWith the development of modern industry, more and more attention has been on the converter, such as inverter power and high frequency switch. Traditional rectifier, whether using diode rectifiers, or the use of thyristor tube of phase controlled rectifier will at the grid side produced a lot of harmonic current and voltage, resulting in low power factor, power grid operation without economic disadvantage. On the basis of this, this paper studies a kind of rectifier control technology based on PWM wave, which can make the input voltage and current of the AC side to achieve the same phase, and reduce the harmonic component in the network side. This technology is the direct power control, referred to as DPC.In this paper, a voltage type PWM rectifier is used as the template. By analyzing the structure of the topology, the mathematical model of three-phase rectifier in the two-phase. By studying and studying instantaneous power theory, instantaneous power calculation module is added in the model. The phase of the input voltage is compared with the design of the two phase voltage ua and ub. According to these modules, the control model of PWM rectifier system is established.Finally, the simulation model of direct power control of PWM rectifier is established in MATLAB /Simulink. The whole control system adopts double close