【摘要】：目前,高壓、大功率逆變器得到了廣泛的應用,其中主要以多電平逆變器為主。雖然多電平逆變器具有器件耐壓要求低、等效開關頻率高、輸出波形好等優(yōu)點,但也有自身的缺陷。它需要的功率開關器件較多,結構較為復雜,從而運行故障機率增大,不僅增加了逆變器的維護成本,而且降低了系統(tǒng)的工作可靠性。一旦多電平逆變器發(fā)生故障會直接影響生產(chǎn)質量和安全,產(chǎn)生嚴重的損失。因此,多電平逆變器的故障診斷問題,已經(jīng)成為目前的研究熱點,快速診斷出多電平逆變器故障,能有效降低生產(chǎn)損失,具有重要的實際意義和經(jīng)濟價值。本文以多電平逆變器中最常用的NPC三電平逆變器為研究對象,分析了NPC三電平逆變器開路故障后的表現(xiàn)形式,并由此提出了基于小波包變換和神經(jīng)網(wǎng)絡的NPC三電平逆變器故障診斷方法。本文首先從NPC三電平逆變器的拓撲結構和工作原理出發(fā),介紹了NPC三電平逆變器的故障類型,通過Matlab/Simulink軟件搭建了故障模型并進行了仿真分析。其次,研究了小波分析和BP神經(jīng)網(wǎng)絡在故障診斷中的應用,采用小波包變換對故障電壓信號進行了小波包分解,提取小波包能量值并構造出特征向量,作為神經(jīng)網(wǎng)絡的輸入,然后設計了神經(jīng)網(wǎng)絡故障分類器,以此對NPC三電平逆變器進行故障診斷,通過仿真數(shù)據(jù)驗證了本文所提出方法的可行性和有效性。最后,搭建了基于DSP芯片控制的NPC三電平逆變器實驗平臺,在該平臺上對逆變器的各種開路故障進行了實驗,并給出了實驗故障波形,通過Matlab GUIDE(圖形用戶界面開發(fā)環(huán)境)完成了NPC三電平逆變器故障診斷系統(tǒng)的界面設計,實驗結果表明該故障診斷系統(tǒng)操作簡單、實用性強、具有很高的故障診斷能力,從而也驗證了本文所提出故障診斷方法的可行性和有效性。
[Abstract]:At present, high-voltage and high-power inverters are widely used, among which multilevel inverter is the main. Although the multilevel inverter has the advantages of low voltage requirement, high equivalent switching frequency and good output waveform, it also has its own defects. It requires more power switch devices and complex structure, which increases the probability of running failure, which not only increases the maintenance cost of the inverter, but also reduces the reliability of the system. Once the multilevel inverter fails, it will directly affect the quality and safety of production, resulting in serious losses. Therefore, the fault diagnosis of multilevel inverter has become a hot research topic at present. It has important practical significance and economic value to quickly diagnose the fault of multilevel inverter, which can effectively reduce the loss of production. In this paper, the NPC three-level inverter, which is the most commonly used multilevel inverter, is taken as the research object, and the performance of NPC three-level inverter after open circuit fault is analyzed. A fault diagnosis method for NPC three-level inverter based on wavelet packet transform and neural network is proposed. Based on the topology and working principle of NPC three-level inverter, the fault types of NPC three-level inverter are introduced in this paper. The fault model is built by Matlab/Simulink software and the simulation analysis is carried out. Secondly, the application of wavelet analysis and BP neural network in fault diagnosis is studied. Wavelet packet transform is used to decompose the fault voltage signal, extract the energy value of wavelet packet and construct the eigenvector as the input of neural network. Then a neural network fault classifier is designed for fault diagnosis of NPC three-level inverter. The feasibility and effectiveness of the proposed method are verified by simulation data. Finally, the experimental platform of NPC three-level inverter based on DSP chip is built, and various open circuit faults of the inverter are tested on the platform, and the experimental fault waveform is given. The interface design of NPC three-level inverter fault diagnosis system is completed by Matlab GUIDE (graphical user interface development environment. The experimental results show that the fault diagnosis system is simple, practical and has high fault diagnosis ability. Thus, the feasibility and effectiveness of the fault diagnosis method proposed in this paper are also verified.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

【相似文獻】

相關期刊論文 前10條

1 Norbert Pluschke;Thomas Grasshoff;;更高效的三電平逆變器[J];電源世界;2010年07期

2 樊昊飛;;一種三電平逆變器空間矢量脈寬調制算法的研究和仿真[J];科技創(chuàng)業(yè)家;2012年18期

3 郭虎成;;三電平逆變器控制技術研究現(xiàn)狀[J];機械制造與自動化;2013年01期

4 古小科;楊景常;張子玉;唐云波;;一種新型的三相三電平逆變器[J];電力電子技術;2013年05期

5 易榮,吳浩烈;三電平逆變器異步電機空間矢量控制技術與仿真研究[J];貴州工業(yè)大學學報(自然科學版);2003年02期

6 王輝 ,聶衛(wèi)民;三電平逆變器的發(fā)展及應用[J];大眾用電;2004年02期

7 康勁松,陶生桂;三電平逆變器系統(tǒng)直接轉矩復式控制[J];同濟大學學報(自然科學版);2005年03期

8 羅潔;桂武鳴;劉子建;;三電平逆變器的空間矢量脈寬調制方法[J];電氣傳動自動化;2006年04期

9 王巍;羅隆福;;地鐵車輛三電平逆變器主傳動系統(tǒng)仿真[J];科學技術與工程;2007年06期

10 李山;劉述喜;王明渝;賀曉蓉;;三電平逆變器控制方式性能比較[J];重慶工學院學報(自然科學版);2008年11期

相關會議論文 前10條

1 李明;朱圓;韓迎朝;;基于扇區(qū)細分的三電平逆變器直接轉矩控制系統(tǒng)研究[A];第十七屆全國煤礦自動化學術年會、中國煤炭學會自動化專業(yè)委員會學術會議論文集[C];2007年

2 李爽;劉浩;;三相三電平逆變器控制系統(tǒng)研究[A];2007年河北省電子學會、河北省計算機學會、河北省自動化學會、河北省人工智能學會、河北省計算機輔助設計研究會、河北省軟件行業(yè)協(xié)會聯(lián)合學術年會論文集[C];2007年

3 王菲;王勇;傅e，

本文編號：2375255