双级矩阵变换器功率开关故障诊断及容错控制策略研究

发布时间：2018-05-16 19:36

本文选题：双级矩阵变换器 + 功率开关故障　；参考：《湘潭大学》2017年硕士论文

【摘要】：矩阵变换器(MC)具有优良的输入输出性能、输入功率因数可控、能量传输可逆、结构紧凑等诸多优点,在电力系统及电力传动等领域有较大的应用前景,这些领域对功率变换器的运行可靠性均提出了较高的要求,故通过实时的在线诊断及适当的容错控制来提高MC系统的可靠性具有重要意义。目前已有文献中提及的MC故障诊断方法和容错控制策略主要针对单级矩阵变换器(CMC)拓扑提出的,本文主要对双级矩阵变换器(TSMC)功率开关故障诊断及容错控制策略进行研究。本文首先介绍了MC功率开关故障诊断方法和容错控制策略的研究背景和意义,就目前已有的MC故障诊断方法和容错控制策略进行了介绍与总结;其次,对TSMC的拓扑结构及其空间矢量调制策略进行了介绍。分别对TSMC在正常情况和功率开关故障下的运行模式进行了分析,并分别对整流级与逆变级功率开关故障下TSMC输出线电压的故障特征做了深入的分析,在此基础上提出了基于开关组误差电压的TSMC功率开关故障诊断方法,该方法可以根据开关组误差电压锁定故障开关组,并能从故障开关组中准确定位故障开关。所提诊断法具有独立于调制策略、诊断速度快、准确率高且不易受负载运行状态以及外界噪声干扰等因素影响等诸多优点,还克服了已有TSMC诊断法需检测直流侧电压,增加传感器这一不足,在一定程度降低了诊断系统的成本。然后,在分析已有MC容错控制策略的基础上,结合TSMC调制策略及拓扑结构的特点,提出了适用于TSMC拓扑的桥臂冗余型容错控制方法。最后,在Matlab/simulink仿真环境下分别搭建了TSMC功率开关故障诊断系统和容错控制系统的仿真模型,并设计了故障诊断系统实验平台,以DSP和CPLD为控制核心,其主要包括主开关电路、驱动电路和信号调理电路等,仿真及实验结果验证了所提故障诊断方法和容错控制策略的正确性和可行性。
[Abstract]:The matrix converter (MCC) has many advantages, such as excellent input and output performance, controllable input power factor, reversible energy transmission, compact structure and so on. These fields require high reliability of power converter, so it is very important to improve the reliability of MC system by real-time on-line diagnosis and proper fault-tolerant control. The methods of MC fault diagnosis and fault-tolerant control are mainly proposed for single-stage matrix converter (CMC) topologies. In this paper, fault diagnosis and fault-tolerant control strategies for power switches of two-stage matrix converters (TSMC) are studied. This paper first introduces the research background and significance of MC power switch fault diagnosis method and fault tolerant control strategy, introduces and summarizes the existing MC fault diagnosis method and fault tolerant control strategy. The topological structure and space vector modulation strategy of TSMC are introduced. The operation mode of TSMC under normal condition and power switch fault is analyzed, and the fault characteristics of TSMC output line voltage under rectifier stage and inverter stage power switch fault are analyzed respectively. On this basis, a fault diagnosis method of TSMC power switch based on the error voltage of switch group is proposed. This method can lock the fault switch group according to the error voltage of switch group, and can accurately locate the fault switch from the fault switch group. The proposed diagnosis method has many advantages, such as independent of modulation strategy, high diagnostic speed, high accuracy and not easy to be affected by factors such as load operation state and external noise, etc. It also overcomes the need to detect DC side voltage by existing TSMC diagnosis method. Adding sensors reduces the cost of diagnostic systems to a certain extent. Then, based on the analysis of the existing MC fault-tolerant control strategy and the characteristics of the TSMC modulation strategy and topology structure, a redundant fault-tolerant control method for the bridge arm is proposed, which is suitable for the TSMC topology. Finally, the simulation models of TSMC power switch fault diagnosis system and fault-tolerant control system are built in the Matlab/simulink simulation environment, and the experimental platform of fault diagnosis system is designed. The main switch circuit is mainly composed of DSP and CPLD as the control core. The simulation and experimental results of driving circuit and signal conditioning circuit verify the correctness and feasibility of the proposed fault diagnosis method and fault-tolerant control strategy.
【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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