【作者】 岳舟；

【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】 矩阵变换器是一种具有简单拓扑结构和一系列理想特性的“绿色变频器”,是一项可从根本上消除电力谐波污染和电网无功损耗的关键技术。本文旨在研究目前影响矩阵变换器实用化的关键基础问题——电压传输比低的问题。针对矩阵变换器电压传输比低这一问题,一些学者和专家提出了过调制的控制策略,提高了矩阵变换器的电压传输比,使其接近于1.0 ,但输出谐波含量过高,不利于应用。在“谐波注入法的矩阵变换器电压传输特性研究”一文中,笔者提出了“谐波注入”的方法,这种方法也能使电压传输比接近于1.0 ,但同样存在着输出谐波含量过高的缺陷。据笔者研究发现——改变控制策略效果不理想,都存在着输出谐波过大的缺陷。针对上述情况,本文将从改变矩阵变换器主电路拓扑结构出发进行研究,首次提出了新型的基于Boost和Buck-Boost的矩阵变换器电路拓扑结构;该拓扑结构和传统交直交矩阵变换器的拓扑结构相似,也采用AC-DC-AC两级变换器的结构形式,中间直流环节无储能元件;其整流级和传统交直交矩阵变换器的整流级相同,为一个3/2相矩阵变换器,逆变级则分别采用Boost和Buck-Boost逆变器的结构形式。由于该新型矩阵变换器能实现输出电压和频率的任意调节,其电压传输比既可大于1,也可小于1,从而可有效解决传统矩阵变换器电压传输比低的难题;通过对该拓扑结构及其等效电路的研究,确定了主电路方案及电路参数;借鉴目前矩阵变换器、Boost和Buck-Boost逆变器已有的理论成果,研究了适合于该新型电路的有效控制策略;研究了电压传输比、输出波形总谐波失真度等主要性能指标与电路参数及控制参数之间的变化规律;构建了仿真模型,对主电路拓扑与控制策略的有效性和可行性进行验证;制作了实验样机,为该新型矩阵变换器的工程化应用打下基础。更多还原

【Abstract】 Matrix Converter(MC) is a kind of“green converter”with simple topology and a series of ideal characteristics, and a key technique to eliminate power harmonic pollution and grid inefficacy power waste basically. In this paper the problem of MC lower voltage transfer ratio is studied which is the key basic problem baffling MC application. Though some researchers and experts proposed overmodulation control strategy to increase MC transfer ratio and made it near to 1.0, its output harmonic connects was too high to be good for application. Another method of raising MC voltage transfer ratio in“Research on voltage transmission characteristic of matrix converter based on harmonic injection method”also can increase transfer ratio to 1.0 but flow of high harmonic components existed either. According to study on changing control strategy, the effects were not good enough and presented high harmonics.Contraposing to above problem, this paper proposes novel MC topologies based on Boost and Buck-Boost in terms of varying MC main circuit topology, which are similar to conventional AC-DC-AC MC adopting AC-DC-AC two-stage construct without energy storage elements in middle DC link. Its rectifier stages are the same as conventional MC which are 3/2 phase MC, while inverter stages adapt Boost and Buck-Boost inverter construct forms, respectively. The problem of low voltage transfer ratio of conventional MC is settled effectively due to these novel MCs can realize discretional regulation of voltage transfer ratio and output frequency and its voltage transfer ratio can be higher or lower than 1.0. Main circuit schemes and parameters are fixed on through researching its topologies and equivalent circuits. Effective control strategies suitable for these novel circuits are studied based on present theoretical harvest of MC, Boost and Buck-Boost inverters. The variety relationship between main characteristics such as voltage transfer ratio, output waveform total harmonic distortion and circuit and control parameters is summed up. Experimental sample device is designed to provide inspiration for these novel MCs further engineering application.更多还原