【作者】 郭前岗；

【导师】 陈明；

【作者基本信息】 西北工业大学 ， 检测技术与自动化装置， 2007， 博士

【摘要】 长期以来，人们一直在致力于寻求一种既易于进行系统集成，又可实现输入功率因数可控、能量可双向流动、输入电流正弦、动静态性能优良的新型电力驱动控制系统。矩阵变换器电机驱动控制系统的出现为大家提供了一种理想的选择。由于其所具有的先进变换器拓扑结构及优良的性能特点，而成为迄今为止最受学术界关注的研究课题。论文集中研究了三相AC／AC矩阵变换器及其组成的电机驱动控制系统的几个关键技术。主要内容有：论文首先以矩阵变换器的“虚拟直流环节”思想为基础，研究了虚拟交-直-交结构的空间矢量调制方法，给出了矩阵变换器与双PWM变换器之间的本质区别与联系。论文系统的分析研究了矩阵变换器电路系统的设计问题。给出了已知条件下主回路开关器件额定电压与额定电流的计算与选择方法；从传统调制理论出发，导出了变换器输入电流及输出电压中开关频率谐波的时域表达式，为输入滤波电路衰减特性的确定与设计提供了可靠的理论依据；讨论了不同形式输入滤波电路的成本问题；分析了矩阵变换器电机驱动系统在故障及非正常停机情况下产生过电流／过电压损坏的机理，给出了一种新颖的保护电路以及电路参数的解析计算方法。论文首次对矩阵变换器的固有最大电压传输比给出了准确、清晰的物理解释；研究了双空间矢量调制下的最大电压传输比问题，提出了一种利用非线性调制提高矩阵变换器电压传输比的方法，讨论了其制约因素及适用条件，并通过仿真给予了验证。论文提出了一种基于矩阵变换器拓扑的电机驱动控制系统的概念，研究了矩阵变换器电机驱动系统的建模问题。视矩阵变换器与感应电动机为一个整体，建立了基于虚拟直流环节思想的矩阵变换器电机驱动系统在静止两相(α／β)坐标系中的动态数学模型；在Matlab／Similink环境下建立了基于空间矢量调制策略的矩阵变换器电机驱动系统的仿真模型，仿真结果证明了该方法的正确性和优越性。该模型具有结构简单、概念清晰、使用方便等特点，可用于矩阵变换器电机驱动系统的动态分析与计算机辅助设计。论文系统的研究了矩阵变换器的空间矢量调制策略。在分析矩阵变换器不同开关组合状态空间矢量的基础上，对传统空间矢量调制理论给予了系统的阐述，推导了双边调制时各空间矢量的调制函数；提出了一种新的旨在减少开关损耗的改进型空间矢量调制方法。较之于传统调制方法，其开关损耗可明显减少。讨论了不同调制策略的双边矢量序列，分布式零矢量调制策略中的零矢量安排作了分析，阐明了不同调制方法及其零矢量的安排对开关损耗与输入／输出波形产生影响的本质，为合理选择调制方法提供了科学依据；论文给出了一种针对变换器开关损耗、输出电压波形质量、输入电流波形质量的分析对比方法。通过计算输出电压谐波所产生的磁链增量、输入谐波电流所产生的电荷增量来间接反映输入／输出波形中谐波的大小；导出了归一化的开关损耗函数，以及归一化谐波磁链、谐波电荷的计算方法。在MATLAB-Simulink环境下仿真研究的结果验证了方法的正确性和有效性。论文最后研究了矩阵变换器电机驱动系统的直接转矩控制。提出了一种既可控制电机定子磁链与电磁转矩，同时又可调控电机输入功率因数的感应电机直接转矩控制方法，建立了这种控制系统的电压矢量表；进一步分析研究了电压空间矢量对直接转矩控制中电磁转矩的影响，找出在定子磁链幅值和磁通角变化对电磁转矩的影响相矛盾时，电压矢量选择的限制条件，并据此提出了一种新颖的12磁链扇区圆优化控制方法，用仿真方法对其正确性与有效性进行了验证；给出了矩阵变换器电机系统直接转矩控制的实现方法，建立了其仿真模型。仿真结果表明：矩阵变换器电机驱动系统的直接转矩控制具有良好的转矩动态响应性能及近似于1的输入功率因数。更多还原

【Abstract】 For a long time, people devoted themselves to searching a new power drive control system, whose power factor can be controlled, with bidirectional power transmission, sinusoid input current waveform, and have a good performance on both dynamic and static state. The emergence of matrix converter motor drive control system has been considered as a perfect option. For its advanced topologic and excellent performance, matrix converter has becoming one of the most interest problems for study. Several key techniques of three phases AC/AC matrix converter and matrix converter feed motor drive system was studied in the paper, including:At the beginning of this paper, it have researched the space vector modulation method of the virtual AC-DC-AC structure by the basic of virtual DC link conception of matrix converter and given the substantive difference and connection between the matrix converter and the dual PWM converter.This paper analyzed and studied the circuit system design of matrix converter. Given the computation and selection method of main loop, with known condition, switch device rated voltage and rated current. Educed the switch frequency harmonic time domain equation of input current and output voltage of matrix converter, from traditional modulation theory, which provide reliable theory argument for attenuation characteristic confirmation and design of input filter circuit. Discussed the cost problem of different input filter circuit; analyzed the truth of produce of over current/over voltage by matrix converter motor drive system in the circumstance of malfunction and disorderly shutdown. Given an original analysis method of protective circuit and computing method of its parameter.Inherence maximal voltage transfer ratio of matrix converter was explained in physical accurately and legibly for the first time, studied maximal voltage transfer ratio under dual space vector modulation, a new method using nonlinear modulation was proposed to develop voltage transfer ratio, discussed the restrict factor and applicability, also verified though simulation.The paper proposed a concept of motor drive control system based on matrix converter topologic, researched the model construction of matrix converter motor drive system. Matrix converter and induction motor were treated as a whole system, dynamic model of matrix converter motor drive system in static two phases (α/β) reference frame was established based on virtual DC link conception. Set up the simulation model of matrix converter motor drive system based on space vector modulation under Matlab/Simulink, the correctness and advantages were verified through simulation. The model has the characters of simple structure, legible concept, using conveniently, and can be used for analysis and CAD of matrix converter motor drive system.The paper systemically studied space vector modulation strategy of matrix converter. Generally clarified the traditional space vector modulation theory based on the analysis of different space vectors of switch combination of matrix converter. Deducted modulation function of each space vector in double-sided modulation; proposed an modified space vector modulation method aimed at reducing switch power lose. Discussed double-sided vector sequence of different modulation strategy, analyzed zero vectors order in distributed zero vectors modulation strategy, clarified the essential influence of different modulation method and zero vectors order on switch power lose and input/output waveform, and provided reasonable basis for selecting modulation method rationally; given a comparison method converter aimed at switch power lose, output voltage waveform quality, input current waveform quality. Indirectly reflected harmonic magnitude in input/output waveform by computing of flux increment introduced by output voltage harmonic, charge increment introduced by input current harmonic:; educed normalized switch lose function, and computing method of normalized harmonic flux and harmonic charge. The correctness and availability were verified through emulation in platform of MATLAB/Simulink.The paper studied direct torque control (DTC) of matrix converter motor drive system at last. Proposed a control method for induction motor, which can control both stator flux and rotor flux, and adjust input power factor at the same time. Established voltage vector table for this control system; Further more analyzed influence of electromagnet torque in DTC by voltage space vector, find out limiting conditions in selecting voltage vectors when flux magnitude and flux angle have antinomy influence in electromagnet torque, hereby proposed an original 12 flux sector optimizing control method. Verified the correctness and validity through the method of simulation; provided implementation of DTC in matrix converter motor drive system, and established the simulation model. The simulation result s indicated that DTC of matrix converter motor drive system have characters of good performance in dynamic response and input power factor close to 1.更多还原