本文關(guān)鍵詞： 三相PWM整流器 滑�？刂� PI控制 前饋解耦 五段式空間矢量調(diào)制 DSP　出處：《安徽大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：21世紀(jì)是科技時代信息時代,科技的不斷創(chuàng)新給人們的生產(chǎn)生活各個方面都帶來了極大的便利。各種電子產(chǎn)品的廣泛應(yīng)用使得人們對電子產(chǎn)品的依賴度也越來越高,電子產(chǎn)品中大量使用的整流器裝置所產(chǎn)生的諧波和無功量對電網(wǎng)污染問題日益嚴(yán)重,PWM整流器能夠很好的解決這一問題。與傳統(tǒng)二極管不控整流和晶閘管相控整流相比,三相電壓型脈沖寬度調(diào)制(Pulse Width Modulation, PWM)整流器具有網(wǎng)側(cè)電流正弦化、功率因數(shù)高、電能可雙向傳輸?shù)葍?yōu)點(diǎn),符合“綠色能源”的要求,它廣泛應(yīng)用于靜止無功發(fā)生器(SVG)高壓直流(HVDC)傳輸、超導(dǎo)磁儲能(SMES)有源電力濾波(APF)和其他領(lǐng)域。目前普遍采用旋轉(zhuǎn)坐標(biāo)系下雙環(huán)PI控制策略,PI調(diào)節(jié)器雖然易于實(shí)現(xiàn),但由于PWM整流器的非線性特征難以滿足快速動態(tài)響應(yīng)、輸入電流畸變小和單位功率因數(shù)的要求。采用滑模變控制結(jié)構(gòu)可以很好解決PWM整流器的非線性問題。 三相PWM整流器是一個時變非線性、強(qiáng)耦合系統(tǒng),控制系統(tǒng)復(fù)雜。在本設(shè)計中采用電流內(nèi)環(huán)前饋解耦策略,電壓外環(huán)滑�？刂撇呗�,在分析其原理的基礎(chǔ)上給出了系統(tǒng)的硬件設(shè)計和軟件程序設(shè)計,最后以MATLAB仿真軟件為平臺進(jìn)行仿真實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果驗(yàn)證了這種控制策略的可行性和優(yōu)越性。 首先,歸納總結(jié)了幾種常見的PWM整流器的拓?fù)浣Y(jié)構(gòu),在分析三相電壓型PWM整流器的工作原理的基礎(chǔ)上,重點(diǎn)分析了其一般數(shù)模型與兩相旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型及其模型的建立,并對兩者之間的轉(zhuǎn)換關(guān)系做了介紹,最后詳細(xì)介紹了電流內(nèi)環(huán)前饋解耦的控制策略和基于滑模的電壓外環(huán)控制策略。 其次,在理論分析的基礎(chǔ)上給出了三相電壓型PWM整流器控制系統(tǒng)的硬件和軟件設(shè)計得到了整個系統(tǒng)的總體結(jié)構(gòu)圖。硬件設(shè)計詳細(xì)介紹了主電路中交流側(cè)電感L和直流側(cè)電容C的作用以及選取原則,對于驅(qū)動電路和檢測電路也做了介紹。軟件設(shè)計方面主要采取模塊化的設(shè)計方式增加了系統(tǒng)的可讀性和可移植性大大縮短了研發(fā)周期。給出了系統(tǒng)軟件的主程序和中斷服務(wù)子程序等程序的流程圖。介紹了軟件系統(tǒng)的整體構(gòu)成和各部分之間的關(guān)系。 最后,根據(jù)設(shè)計需要給定參數(shù),搭建了Matlab的仿真平臺,給出穩(wěn)態(tài)情況下和動態(tài)情況下的仿真實(shí)驗(yàn)結(jié)果并做出來分析,仿真實(shí)驗(yàn)驗(yàn)證了設(shè)計方法的可行和有效性。
[Abstract]:21th century is the information age of the scientific and technological era. The continuous innovation of science and technology brings great convenience to all aspects of people's production and life. The extensive application of various electronic products makes people rely more and more on electronic products. The harmonic and reactive power produced by the widely used rectifier in electronic products can solve this problem very well. Compared with the traditional diode uncontrolled rectifier and thyristor phase-controlled rectifier, the PWM rectifier can solve this problem. Pulse Width Modulation (PWM) rectifier with three-phase voltage-mode pulse width modulation (PWM) has the advantages of sinusoidal current, high power factor and two-way transmission of electric energy, which meets the requirements of "green energy". It is widely used in SVG high voltage DC) transmission, superconducting magnetic energy storage (SMES) active power filter (APFF) and other fields. However, the nonlinear characteristics of PWM rectifier are difficult to meet the requirements of fast dynamic response, small input current distortion and unit power factor. The nonlinear problem of PWM rectifier can be well solved by using sliding mode variable control structure. The three-phase PWM rectifier is a time-varying nonlinear, strongly coupled system, and the control system is complex. In this design, the current inner loop feedforward decoupling strategy and the voltage outer loop sliding mode control strategy are used. On the basis of analyzing its principle, the hardware design and software program design of the system are given. Finally, the simulation experiment is carried out on the platform of MATLAB simulation software. The experimental results verify the feasibility and superiority of the control strategy. Firstly, the topology of several common PWM rectifiers is summarized. Based on the analysis of the working principle of three-phase voltage-source PWM rectifier, In this paper, the general number model and the mathematical model in two-phase rotating coordinate system are analyzed, and the transformation relationship between them is introduced. Finally, the current internal loop feedforward decoupling control strategy and the sliding mode based voltage outer loop control strategy are introduced in detail. Secondly, Based on the theoretical analysis, the hardware and software design of the three-phase voltage source PWM rectifier control system is given. The overall structure of the system is obtained. The hardware design introduces the AC side inductor L and the DC side in the main circuit in detail. The function and selection principle of capacitance C, This paper also introduces the drive circuit and the detection circuit. The modularization design method is adopted to increase the readability and portability of the system. The main program of the system software is given. The whole structure of the software system and the relationship between each part are introduced. Finally, the simulation platform of Matlab is built according to the design requirements, and the simulation results under steady and dynamic conditions are given and analyzed. The simulation results verify the feasibility and effectiveness of the design method.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM461

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