高频链三相四桥臂矩阵变换器调制及控制研究

发布时间：2018-04-08 18:31

本文选题：高频链变换器　切入点：三相四桥臂逆变器　出处：《燕山大学》2014年硕士论文

【摘要】：高频链矩阵变换器是一种新型电路拓扑，，不仅能够很好地解决传统工频变压器在逆变技术中固有的问题，而且实现了逆变器的高频化、小型化。因其优越的控制性能和较低的成本，逐渐成为逆变器发展的趋势。随着电力电子技术的迅猛发展，其潜在优势越来越明显，分布式发电技术的发展也拓展了其应用领域。本文主要研究的是高频链三相四桥臂矩阵变换器拓扑，其可以为三相不平衡负载提供输出侧平衡的三相电压。本文首先介绍了矩阵变换器及传统三相四桥臂逆变器的研究现状，然后论述了高频逆变技术，将二者结合起来，组成高频链三相四桥臂矩阵变换器。该拓扑将二者的优点结合，既可以实现变压器的高频化，矩阵变换器能量的双向流动，也可以抑制输出侧的三相不平衡电压。为了实现矩阵变换器的变流器功能，本文从拓扑结构上对电路进行解耦，介绍了适用于矩阵变换器的两种调制策略，解结耦和一体化的SPWM调制策略。分别研究了两种调制策略的实现方法，分析了一体化SPWM调制策略的工作模态并进行相应的仿真验证。然后，在调制策略实现矩阵变换器安全换流的基础上，本文通过研究高频链三相四桥臂矩阵变换器带不平衡负载时的闭环控制策略，来改善系统的性能。分别研究了传统PI调节的双闭环控制，基于对称分量法的双旋转坐标的双闭环控制，陷波器滤除同步旋转坐标平面的二倍频交流谐波的闭环控制方式。通过仿真验证各种控制策略的可实现性，并且对这三种策略下控制系统的性能进行对比分析。最后，搭建该系统的软、硬件实验平台。主电路采用自己绘制的矩阵变换器电路板，控制电路是由DSP和CPLD组成，通过实验对上述调制策略和控制方法进行验证。
[Abstract]:High frequency chain matrix converter is a new circuit topology, which can not only solve the inherent problems of traditional power frequency transformer in inverter technology, but also realize the high frequency and miniaturization of inverter.Because of its superior control performance and low cost, it has gradually become the trend of inverter development.With the rapid development of power electronics technology, its potential advantages become more and more obvious. The development of distributed generation technology has also expanded its application field.In this paper, the topology of the high frequency chain three-phase four-leg matrix converter is studied, which can provide the output balanced three-phase voltage for the three-phase unbalanced load.This paper first introduces the research status of the matrix converter and the traditional three-phase four-leg inverter, then discusses the high-frequency inverter technology, and combines the two to form the high-frequency chain three-phase four-bridge arm matrix converter.By combining the advantages of the two topologies, it can not only realize the high frequency of transformer, the bidirectional flow of energy in matrix converter, but also suppress the unbalance voltage of three phase on the output side.In order to realize the function of matrix converter, this paper decouples the circuit from the topology, and introduces two modulation strategies, decoupling and integrated SPWM modulation strategy, which are suitable for matrix converter.The realization methods of two modulation strategies are studied, and the working modes of the integrated SPWM modulation strategy are analyzed and the corresponding simulation results are given.Then, on the basis of the modulation strategy to realize the safe commutation of the matrix converter, the closed-loop control strategy of the three-phase four-arm matrix converter with high frequency chain is studied to improve the performance of the system.The double closed loop control of traditional Pi regulation, the double closed loop control of double rotation coordinate based on symmetric component method, and the closed loop control method of filtering the double frequency harmonic of the plane of synchronous rotating coordinate by notch filter are studied respectively.The realizability of various control strategies is verified by simulation, and the performance of the control system under these three strategies is compared and analyzed.Finally, the software and hardware of the system are built.The main circuit uses the matrix converter circuit board drawn by itself, and the control circuit is composed of DSP and CPLD. The above modulation strategy and control method are verified by experiments.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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