文档介绍：中功率三相电压型PWM整流电路设计
摘要
随着电力电子技术的发展,整流器的发展经历了由不控整流器、相控整流器到PWM整流器的发展过程。不控整流器和相控整流器对电网注入大量谐波及无功,造成严重的电网“污染”。PWM整流器使网侧电流正弦化,且运行于单位功率因数,解决传统整流器的弊端,满足“绿色电能变换”潮流,因而得到了广泛的应用与研究。
本文首先概述PWM整流器,简略介绍了PWM整流器的分类。尽管分类方法多种多样,但最基本的分类方法是将PWM整流器分成电压型和电流型两大类。
由于本设计采用的是三相电压型PWM整流电路,所以详细分析了其主电路的拓扑结构、工作原理。并在此基础上进行直流侧电感、交流侧电容和IGBT管参数的计算。控制电路通过专门用于三相SPWM波发生和控制的集成电路芯片SA8281和单片机89C52及其外围电路来实现。控制系统中采用电压、电流双闭环控制。按典型II系统设计电压外环,其主要作用是控制三相VSR直流侧电压;按典型I系统设计电流内环,其主要作用是按电压外环输出的电流指令进行电流控制。驱动电路采用由美国国际整流器公司生产的大功率IGBT专用的桥式电路驱动集成芯片IR2110及其外围电路来实现。通过单相桥式整流电路来设计驱动电源。保护电路主要是通过程序来实现的。具体需要设计检测电路,通过检测电路将电流信号、电压信号发送到单片机,然后单片机经过内部处理后,决定是否命令SA8281中断SPWM波的输出。
本设计最后使用ORCAD/Pspice软件对三相电压型PWM整流电路的主电路进行性能仿真。实验结果验证三相电压型PWM整流电路输出稳定的直流电压,实现了高功率因数整流,电网侧相电压、电流基本同相位,电流跟随性能好的优点。
关键词:PWM整流器;双闭环;ORCAD/Pspice仿真
Abstract
With the development of power electronic technology, rectifier development is experienced by uncontrollable rectifier, phase controlled rectifier to the development process of PWM rectifier. Uncontrollable rectifier and phase controlled rectifier on power grid into large harmonics and reactive power , cause serious pollution. PWM rectifier can make side current sine, and runs on unit power factor rectifier, solve the disadvantages, to meet the " green electricity transform " trend, thus obtains the widespread application and research. This paper first gives an overview of PWM rectifier, briefly introduces the classification of PWM rectifier. Although the classification methods varied, but the most basic classification method is divided into PWM rectifier voltage and current of two kinds.
Because this design is used in three-phase voltage type rectifier circuit, so a detailed analysis of the main circuit topological structure, work principle and mathematic model. And on this basis the DC side capacitor and inductor, AC side of IGBT pipe parameters calculation. Control circuit for three-phase SPWM wave through the occurrence and control of integrated circuit chip SA8281 and 89C52 MCU and its peripheral ci