同步发电机励磁系统在线故障诊断研究

发布时间：2018-02-06 03:21

本文关键词： 励磁功率单元晶闸管故障诊断 MATLAB DSP　出处：《重庆理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：在同步发电机中,励磁系统作为它的重要组成部分,其故障与否对发电机输出电能质量的好坏有着直接的影响,同时也影响着整个电力系统运行的安全,稳定。由晶闸管组成的三相桥式可控整流电路所组成的励磁功率单元被目前几乎所有自并励励磁功率单元所采用,但由于其恶劣的工作环境导致其易于损坏。特别是伴随着我国电力需求的进一步增大,大容量,甚至是超大容量同步发电机组的应用日渐广泛,而作为其配套系统的采用多励磁柜并联方式增大励磁容量的励磁系统也得到了大量的应用。因此,在对中、小型同步发电机组中的单励磁柜故障诊断策略研究的基础上研究多励磁柜并联励磁系统的故障诊断策略显得尤为重要。本课题通过对国内外研究现状进行全面系统的分析研究,对各种励磁系统故障形式进行了较为全面的分析总结,重点针对励磁功率单元的故障诊断方法进行了研究分析,对传统方法提出了改进方案,得到了一套新的励磁功率单元故障诊断方法。并在此基础上研究出了一套新的针对大容量多桥并联励磁功率单元的故障诊断策略。本课题首先通过MATLAB-Simulink实验仿真平台对单励磁功率单元进行模型搭建,分别对正常工作情况以及各种故障情况进行仿真分析,对比现有方法的优缺点,总结得到了:基于同步时窗的励磁故障诊断方法、基于小波分析的励磁故障诊断方法。通过实时性、准确性、可靠性三个方面的指标认为基于同步时窗的励磁故障诊断方法更适用于中、小容量励磁功率单元,即单励磁柜功率单元的故障诊断。其次,在单励磁柜故障诊断方法的基础上,在MATLAB-Simulink仿真平台上搭建多励磁柜并联功率单元主回路模型,对各种故障情况得到的各种故障波形进行分析总结得到了针对多桥并联励磁系统功率单元的故障诊断方法。最后,选择TI公司的TMS320F28335型DSP作为系统主芯片对励磁功率单元故障诊断进行了硬件结构设计和软件程序的开发并将其嵌入DSP中对实际励磁柜功率单元中进行故障诊断试验,发现该诊断策略能够对励磁功率单元故障位置进行准确有效的、实时的故障定位,达到了研究的目的和预期效果。
[Abstract]:In synchronous generator, excitation system as an important part of it, has a direct impact on the fault of the generator output power quality, but also affects the operation of the power system security and stability. The excitation power unit composed of three-phase bridge controlled rectifier circuit composed of a thyristor is at present almost all of the self and shunt excitation power unit used, but because of its bad working environment which is easy to damage. Especially with the further increase of China's power demand, large capacity, and even the application of large capacity synchronous generator excitation system is increasingly extensive, as its supporting system with multi parallel excitation cabinet the increase of excitation capacity have also been widely used. Therefore, in the study, many small excitation synchronous generator based in single excitation cabinet on the research of fault diagnosis strategy The fault diagnosis strategy of cabinet parallel excitation system is very important. This paper analyzes the research systematically the research status at home and abroad, the various forms of excitation system fault analysis comprehensive fault diagnosis method, focusing on the excitation power unit are analyzed, put forward an improvement of the traditional method, get a new excitation power unit fault diagnosis method. On this basis, a set of new large capacity for multi bridge parallel excitation power unit fault diagnosis strategy. Firstly, through the MATLAB-Simulink simulation platform for the model of the single excitation power unit are set up respectively, the normal work and fault by simulation analysis, comparing the advantages and disadvantages of existing methods, are summarized: excitation fault diagnosis method based on window synchronization, based on Excitation fault diagnosis method of wavelet analysis. Through real-time, accuracy, reliability index of the three aspects that synchronous excitation fault diagnosis method based on windows more suitable for medium and small capacity, excitation power unit, single excitation cabinet power unit fault diagnosis. Secondly, based on the fault diagnosis method of single excitation cabinet. How to build up the excitation cabinet parallel power unit main loop model in MATLAB-Simulink simulation platform, all kinds of faults waveforms of various fault conditions were analyzed by the method of fault diagnosis for multi bridge parallel power unit excitation system. Finally, select the TMS320F28335 DSP TI as the main chip of the system excitation power unit fault diagnosis the development of hardware design and software program and fault diagnosis test on the actual excitation power unit in the cabinet is embedded in DSP, found that the diagnosis The fault strategy can make the fault location of the excitation power unit accurate and effective, the real time fault location, and achieve the purpose and expected effect of the research.

【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM31

【参考文献】