本文關(guān)鍵詞： 勵(lì)磁功率單元 晶閘管 故障診斷 MATLAB DSP　出處：《重慶理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在同步發(fā)電機(jī)中,勵(lì)磁系統(tǒng)作為它的重要組成部分,其故障與否對(duì)發(fā)電機(jī)輸出電能質(zhì)量的好壞有著直接的影響,同時(shí)也影響著整個(gè)電力系統(tǒng)運(yùn)行的安全,穩(wěn)定。由晶閘管組成的三相橋式可控整流電路所組成的勵(lì)磁功率單元被目前幾乎所有自并勵(lì)勵(lì)磁功率單元所采用,但由于其惡劣的工作環(huán)境導(dǎo)致其易于損壞。特別是伴隨著我國(guó)電力需求的進(jìn)一步增大,大容量,甚至是超大容量同步發(fā)電機(jī)組的應(yīng)用日漸廣泛,而作為其配套系統(tǒng)的采用多勵(lì)磁柜并聯(lián)方式增大勵(lì)磁容量的勵(lì)磁系統(tǒng)也得到了大量的應(yīng)用。因此,在對(duì)中、小型同步發(fā)電機(jī)組中的單勵(lì)磁柜故障診斷策略研究的基礎(chǔ)上研究多勵(lì)磁柜并聯(lián)勵(lì)磁系統(tǒng)的故障診斷策略顯得尤為重要。本課題通過(guò)對(duì)國(guó)內(nèi)外研究現(xiàn)狀進(jìn)行全面系統(tǒng)的分析研究,對(duì)各種勵(lì)磁系統(tǒng)故障形式進(jìn)行了較為全面的分析總結(jié),重點(diǎn)針對(duì)勵(lì)磁功率單元的故障診斷方法進(jìn)行了研究分析,對(duì)傳統(tǒng)方法提出了改進(jìn)方案,得到了一套新的勵(lì)磁功率單元故障診斷方法。并在此基礎(chǔ)上研究出了一套新的針對(duì)大容量多橋并聯(lián)勵(lì)磁功率單元的故障診斷策略。本課題首先通過(guò)MATLAB-Simulink實(shí)驗(yàn)仿真平臺(tái)對(duì)單勵(lì)磁功率單元進(jìn)行模型搭建,分別對(duì)正常工作情況以及各種故障情況進(jìn)行仿真分析,對(duì)比現(xiàn)有方法的優(yōu)缺點(diǎn),總結(jié)得到了:基于同步時(shí)窗的勵(lì)磁故障診斷方法、基于小波分析的勵(lì)磁故障診斷方法。通過(guò)實(shí)時(shí)性、準(zhǔn)確性、可靠性三個(gè)方面的指標(biāo)認(rèn)為基于同步時(shí)窗的勵(lì)磁故障診斷方法更適用于中、小容量勵(lì)磁功率單元,即單勵(lì)磁柜功率單元的故障診斷。其次,在單勵(lì)磁柜故障診斷方法的基礎(chǔ)上,在MATLAB-Simulink仿真平臺(tái)上搭建多勵(lì)磁柜并聯(lián)功率單元主回路模型,對(duì)各種故障情況得到的各種故障波形進(jìn)行分析總結(jié)得到了針對(duì)多橋并聯(lián)勵(lì)磁系統(tǒng)功率單元的故障診斷方法。最后,選擇TI公司的TMS320F28335型DSP作為系統(tǒng)主芯片對(duì)勵(lì)磁功率單元故障診斷進(jìn)行了硬件結(jié)構(gòu)設(shè)計(jì)和軟件程序的開(kāi)發(fā)并將其嵌入DSP中對(duì)實(shí)際勵(lì)磁柜功率單元中進(jìn)行故障診斷試驗(yàn),發(fā)現(xiàn)該診斷策略能夠?qū)?lì)磁功率單元故障位置進(jìn)行準(zhǔn)確有效的、實(shí)時(shí)的故障定位,達(dá)到了研究的目的和預(yù)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.

【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM31

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本文編號(hào)：1493455