基于DSP的三相电压型PWM整流器的设计和研究

发布时间：2018-01-18 07:14

本文关键词：基于DSP的三相电压型PWM整流器的设计和研究　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着电力电子技术的广泛应用与发展，供电系统中添加了大量的非线性负载，引起电网电压、电流的畸变，导致电力污染，传统的二极管和晶闸管整流系统作为各类电力电子设备与电网的接口，造成的谐波污染尤为严重。近年来PWM整流技术由于具有高功率因数、低谐波污染、能量可以实现双向流动、小容量储能环节、恒定直流电压控制等优点，可以有效的减轻谐波污染，因而得到了广泛的研究和工程应用。通过阅读大量参考文献和资料，熟悉了PWM整流器在各种坐标系下的数学模型和相关控制策略，在此基础上，本文以三相电压型PWM整流器为研究对象，对其电压环控制器、电流环控制器以及空间矢量脉宽调制(SVPWM)控制算法进行了理论研究。然后，，采用滑模变结构控制方法、PI参数控制方法和SVPWM调制技术对三相电压型PWM整流器控制系统进行了设计，并进行了仿真分析。最后，以TI公司的DSP——TMS320F2812芯片为控制核心，在借鉴国内外研究成果的基础上，实现了该电压电流双闭环控制系统。本文的主要内容包括：在原理和理论分析方面，介绍了三相电压型PWM整流器的拓扑结构、数学模型及其坐标变换，包括三相静止坐标系和两相旋转坐标系下的数学模型，常用的控制策略以及SVPWM脉宽调制技术及其实现；在系统建模和仿真方面，建立了双闭环的三相电压型PWM整流器控制系统Matlab仿真模型，其中电压环采用滑模变结构控制策略，电流环采用传统的PI调节器，并采取前馈解耦的控制策略，给出了系统仿真波形和结论；硬件设计方面，主要包括主电路电感和电容等参数的计算和选取、功率器件的选型以及其驱动保护电路的设计、过零检测及采样电路的设计和各种保护电路的设计；系统软件实现方面，给出了基于TMS320F2812控制芯片的系统软件实现的主程序流程、中断程序流程和算法子程序流程，对各程序进行了较为详细的介绍；最后，在基于TMS320F2812的实验平台上搭建了实验样机，调试了三相电压型PWM整流器控制系统，测试了不同负载下的主要输出波形，得到了与理论分析相一致的实验结果，证实了系统设计的可靠性和可行性。
[Abstract]:With the wide application and development of power electronics technology, a large number of nonlinear loads have been added to the power supply system, resulting in the distortion of power network voltage and current, resulting in power pollution. The traditional diode and thyristor rectifier system, as the interface between power electronic equipment and power grid, has caused serious harmonic pollution. In recent years, PWM rectifier technology has high power factor and low harmonic pollution. Energy can realize two-way flow, small capacity energy storage, constant DC voltage control and other advantages, can effectively reduce harmonic pollution, so it has been widely studied and applied in engineering. Through reading a large number of references and materials, we are familiar with the mathematical models and related control strategies of PWM rectifier in various coordinate systems. On this basis, this paper takes the three-phase voltage-source PWM rectifier as the research object. The voltage loop controller, current loop controller and space vector pulse width modulation (SVPWM) control algorithm are studied theoretically. Then, sliding mode variable structure control method is adopted. Pi parameter control method and SVPWM modulation technology for three-phase voltage source PWM rectifier control system is designed and simulated. Finally. Taking TI's DSP--TMS320F2812 chip as the control core, the voltage and current double closed loop control system is realized on the basis of referring to the domestic and foreign research results. The main contents of this paper are as follows: in principle and theoretical analysis, the topology, mathematical model and coordinate transformation of three-phase voltage-source PWM rectifier are introduced. It includes mathematical model of three-phase stationary coordinate system and two-phase rotating coordinate system, common control strategy, SVPWM pulse width modulation technology and its implementation. In the aspect of system modeling and simulation, the Matlab simulation model of three-phase voltage source PWM rectifier control system is established, in which the sliding mode variable structure control strategy is used in the voltage loop. The traditional Pi regulator is used in the current loop and the feedforward decoupling control strategy is adopted. The simulation waveform and conclusion are given. The hardware design mainly includes the calculation and selection of main circuit inductance and capacitance, the selection of power device and the design of its drive and protection circuit. The design of zero crossing detection and sampling circuit and the design of various protection circuits; In the aspect of system software realization, the main program flow, interrupt program flow and algorithm subroutine flow of system software realization based on TMS320F2812 control chip are given. The procedures are introduced in detail. Finally, the experimental prototype is built on the experimental platform based on TMS320F2812, the control system of three-phase voltage-source PWM rectifier is debugged, and the main output waveforms under different loads are tested. The experimental results are consistent with the theoretical analysis, and the reliability and feasibility of the system design are verified.
【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】：TM461

【参考文献】