双级矩阵变换器故障诊断策略研究

发布时间：2018-05-19 03:32

本文选题：TSMC + 故障诊断　；参考：《湘潭大学》2017年硕士论文

【摘要】：双级矩阵变换器(TSMC)具有功率因数可调、输入输出性能优良、能量双向流动及结构紧凑等优点,在电力系统、电力传动等领域具有较大的应用前景,这些应用场合都需要系统能长期稳定、可靠地运行。然而,TSMC由于功率开关数量多、工作环境复杂等原因其发生故障的概率较大,阻碍了TSMC的市场化应用。因此,对TSMC进行故障诊断研究使其在故障后能及时的得到保护具有很大的研究意义。本文运用电压法对TSMC功率开关故障进行研究。本文的主要研究内容如下:首先,本文介绍了课题的研究背景和意义,并分别对基于电流法和基于电压法的常规矩阵变换器(CMC)和TSMC的故障诊断方法进行了详细分析。介绍了TSMC的拓扑结构以及输入输出之间的函数关系,并对整流级和逆变级双空间矢量调制下TSMC的工作原理进行了分析。其次,分别对TSMC正常和发生故障后的运行模式进行了分析,根据故障后负载电流的流向,分别得到了整流级和逆变级功率开关开路后TSMC输出相电压的故障特征,并总结了两者之间故障特征的异同。针对整流级和逆变级开关故障有时会产生相同的输出相电压故障特征而难以准确定位故障开关,结合逆变级空间矢量调制的特点,本文提出了在逆变级与故障开关同层桥臂有两个开关导通时,根据此时的开关组误差电压个数以及开关状态定位故障开关的方法。所提诊断方法具有诊断准确、无需检测直流侧电压、诊断速度快、实现简单等优点。搭建了基于所提诊断方法的仿真模型,仿真结果验证了所提诊断方法的正确性。最后,搭建了TSMC故障诊断的实验平台,详细介绍了主开关的选取、缓冲电路、驱动电路、信号调理电路的设计方法;并设计了以TMS320F28335+EPM570为控制器的软件系统以实现所提故障诊断方法。对实验结果进行了分析,实验结果验证了所提诊断方法的正确性和有效性。
[Abstract]:Two-stage matrix converter (TSMC) has the advantages of adjustable power factor, excellent input and output performance, bi-directional energy flow and compact structure. It has great application prospect in power system, power transmission and other fields. These applications require the system to run steadily and reliably for a long time. However, due to the large number of power switches and complex working environment, the TSMC has a high probability of failure, which hinders its market-oriented application. Therefore, it is of great significance to study the fault diagnosis of TSMC so that it can be protected in time. In this paper, the voltage method is used to study the fault of TSMC power switch. The main contents of this paper are as follows: firstly, the background and significance of the research are introduced, and the fault diagnosis methods of conventional matrix converters based on current method and voltage method are analyzed in detail. This paper introduces the topological structure of TSMC and the function relationship between input and output, and analyzes the working principle of TSMC under double space vector modulation of rectifier stage and inverter level. Secondly, the operation mode of TSMC is analyzed respectively. According to the flow direction of load current after failure, the fault characteristics of output phase voltage of TSMC after rectifier stage and inverter stage power switch are obtained, respectively. The similarities and differences of fault characteristics between them are summarized. The fault of rectifier stage and inverter stage sometimes produces the same fault characteristics of output phase voltage, so it is difficult to locate the fault switch accurately, combining with the characteristics of inverter stage space vector modulation. This paper presents a method to locate the fault switch according to the number of the error voltages of the switch group and the switching state when the inverter stage has two switches on the same layer of the bridge arm of the fault switch. The proposed diagnostic method has the advantages of accurate diagnosis, no need to detect DC voltage, fast diagnosis speed and simple realization. The simulation model based on the proposed diagnosis method is built, and the simulation results verify the correctness of the proposed diagnosis method. Finally, the experiment platform of TSMC fault diagnosis is built, and the design method of main switch, buffer circuit, drive circuit and signal conditioning circuit are introduced in detail. A software system based on TMS320F28335 EPM570 controller is designed to realize the proposed fault diagnosis method. The experimental results show that the proposed diagnosis method is correct and effective.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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