【作者】 李利娟；

【导师】 朱建林；

【作者基本信息】 湘潭大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 在传统矩阵变换器(Conventional Matrix Converter ,简写为CMC)和多电平逆变器的基础上,提出了一种新颖的电力电子拓扑结构——多电平矩阵变换器(Multilevel Matrix Converter,简写为MMC)。多电平矩阵变换器可以实现多个电平电压的阶梯波输出,因而输出电压波形更接近正弦,谐波含量降低;电路结构对称,输入/输出端可以互换,则既可实现升压也可实现降压,能突破传统矩阵变换器电压传输比0.866的限制,是一种较为理想的电能变换装置。因此,MMC将是研究电能变换装置和新能源利用中的热点和挑战。本文以多电平矩阵变换器为对象,研究了多电平矩阵变换器的拓扑电路、基本原理,阐述了MMC实现两电平运行的控制方法,创造性地提出了三电平运行时的空间矢量调制策略,且通过计算机仿真实验验证策略的可行性;建立了多电平矩阵变换器系统的数学模型,得出状态空间模型,在此基础上分析了系统的稳定性、能控性和能观测性;这些对进一步研究多电平矩阵变换器有一定的参考价值。具体地,本文的主要内容和主要研究成果如下:对照传统矩阵变换器的拓扑结构,利用多电平变换器基本单元思想,介绍了多电平矩阵变换器拓扑电路的生成,并详细地分析了构成其拓扑电路的H桥开关单元工作状态和支路连接操作规律。建立了多电平矩阵变换器系统的数学模型,得出状态空间模型,提出了判断稳定性的李亚普诺夫函数,并采用数值计算方法验证了稳定性结论且分析了系统能控、能观测性。基于空间矢量调制原理,分析了多电平矩阵变换器基本空间矢量的产生,阐述了多电平矩阵变换器在两电平运行时的调制策略,提出了三电平运行时的控制方法;并利用MATLAB/Simulink软件,搭建仿真模型,得到MMC分别工作在两电平和三电平时的仿真结果,对仿真结果进行分析,验证了控制算法的可行性和有效性。更多还原

【Abstract】 On the basis of the conventional matrix converter and the multilevel inverter, a novel multilevel matrix converter as a kind of power electronics is proposed. The multilevel matrix converter can operate with multilevel switching, so the output voltage waveform is closer to the sine wave with minimized harmonic contents. It has symmetric circuit, input side and output side can be reversed, so it is capable of both increasing and decreasing the voltage magnitude, and can break through the restriction that the voltage transfer ratio of conventional matrix converter is less than 0.866. As a word, the multilevel matrix converter is an ideal power converter, which would attract significant attention and be challenge in the field of transform electric energy device and new energy sources.Regarding the topic“the multilevel matrix converter”as the main subject, this paper has studied the topology of the circuit and the basic principle, expounded the strategy operating with two-level switching. The space vector modulation strategy that the multilevel matrix converter operates with three-level switching is developed in a creative way, and the simulation results validate the feasibility of the strategy. The mathematical model and state space model of the multilevel matrix converter system are founded. On the basis of them, the system stability, controllability and observability are analyzed. These are useful for researching the multilevel matrix converter. In detail, the main content of this paper is as follows:In comparison with conventional matrix converter topology, using the basic unit thought of multilevel converter, this paper introduces the generating of multilevel matrix converter topology circuit, and analyzes the states of the H-bridge switch cell and the principle of branch operating.Mathematical model of multilevel matrix converter system has been set up, furthermore its state space model is educed. The system stability is judged by Lyapunov’s method, as well as numerical method, and controllability and observability are analyzed with the numerical method.Based on space vector modulation, how to generate the elementary space vectors is depicted. There, the modulation strategy operating with two-level switching is expatiated and the modulation strategy operating three-level switching is developed. Then, simulation model is built using MATLAB/Simulink, and the results test the feasibility and effectiveness of control algorithms.更多还原