【摘要】：大功率電力電子設(shè)備廣泛應(yīng)用于電力、交通等許多領(lǐng)域,多電平拓?fù)浣Y(jié)構(gòu)結(jié)合新型大容量開關(guān)器件、優(yōu)良的控制方法是大功率電力電子設(shè)備的發(fā)展方向。其中,二極管中點(diǎn)鉗位(Neutral-Point Clamped)型三電平逆變器由于其較為簡(jiǎn)單的結(jié)構(gòu)和控制、較高的性價(jià)比,成為目前應(yīng)用較廣的多電平變換器之一。文章首先介紹幾種不同拓?fù)浣Y(jié)構(gòu)的多電平變換器的研究現(xiàn)狀以及研究熱點(diǎn);隨后詳細(xì)分析三電平的不同的空間矢量調(diào)制算法的優(yōu)劣。與兩電平相比,三電平擁有更多的矢量,實(shí)現(xiàn)SVPWM的途徑隨之增多,何種實(shí)現(xiàn)方法準(zhǔn)確度高、計(jì)算量小、處理速度快、占用處理芯片內(nèi)存小等問題值得深入分析;本文研究對(duì)象為地鐵輔助變流器,因此對(duì)輸出波形質(zhì)量要求很高,需要具備很高的穩(wěn)態(tài)精度,很好的動(dòng)態(tài)性能,要求在頻繁的突加、突減負(fù)載時(shí),系統(tǒng)仍然能夠穩(wěn)定運(yùn)行。針對(duì)該要求,本文提出一種基于離散域的PI+狀態(tài)反饋的控制策略;針對(duì)離散域的負(fù)載電流前饋解耦通道復(fù)雜難求,本文詳細(xì)分析控制器的作用機(jī)理,據(jù)此提出一種新型求解負(fù)載電流前饋傳遞函數(shù)的方法,仿真和實(shí)驗(yàn)結(jié)果證明該控制方法不僅使系統(tǒng)穩(wěn)態(tài)精度高,而且動(dòng)態(tài)性能也能滿足要求。最后根據(jù)NPC型三相三電平逆變器帶異步電機(jī)開環(huán)控制系統(tǒng)的低頻震蕩現(xiàn)象,分析異步電機(jī)容易低頻振蕩的機(jī)理,指出NPC型三相三電平逆變器在控制性能良好的情況下,死區(qū)是引起異步電機(jī)低頻振蕩的主要原因,據(jù)此提出一種新型死區(qū)補(bǔ)償策略來改善此現(xiàn)象。
[Abstract]:High-power electronic equipment is widely used in many fields such as power, transportation and so on. Multi-level topology combined with new large-capacity switching devices, excellent control method is the development direction of high-power electronic equipment. Among them, diode midpoint clamp (Neutral-Point Clamped) three-level inverter has become one of the most widely used multilevel converters because of its simple structure and control and high performance-price ratio. In this paper, the research status and research hotspots of several multilevel converters with different topologies are introduced, and then the advantages and disadvantages of different space vector modulation algorithms for three-level are analyzed in detail. Compared with the two levels, the three levels have more vectors, and the ways to realize SVPWM are increased. The problems such as high accuracy, small computation, fast processing speed and small memory occupation of the processing chip are worthy of in-depth analysis. The research object of this paper is subway auxiliary converter, so the quality of output waveform is very high, it needs to have high steady-state accuracy and good dynamic performance, and the system can still run stably when the load is suddenly added and suddenly reduced. In order to meet this requirement, a control strategy based on discrete domain PI state feedback is proposed in this paper. In view of the complexity and difficulty of load current feedforward decoupling channel in discrete domain, the action mechanism of the controller is analyzed in detail, and a new method for solving load current feedforward transfer function is proposed. The simulation and experimental results show that the control method not only makes the steady-state accuracy of the system high, but also meets the requirements of dynamic performance. Finally, according to the low frequency vibration phenomenon of NPC three-phase three-level inverter with asynchronous motor open-loop control system, the mechanism of easy low-frequency oscillation of asynchronous motor is analyzed, and it is pointed out that the NPC three-phase three-level inverter has good control performance. Dead time is the main cause of low frequency oscillation of asynchronous motor. Based on this, a new dead time compensation strategy is proposed to improve this phenomenon.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM464

【相似文獻(xiàn)】

相關(guān)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(diào)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(shù)研究現(xiàn)狀[J];機(jī)械制造與自動(dòng)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(shù);2013年05期

5 易榮,吳浩烈;三電平逆變器異步電機(jī)空間矢量控制技術(shù)與仿真研究[J];貴州工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2003年02期

6 王輝 ,聶衛(wèi)民;三電平逆變器的發(fā)展及應(yīng)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(zhuǎn)矩復(fù)式控制[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)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(diào)制方法[J];電氣傳動(dòng)自動(dòng)化;2006年04期

9 王巍;羅隆福;;地鐵車輛三電平逆變器主傳動(dòng)系統(tǒng)仿真[J];科學(xué)技術(shù)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(xué)院學(xué)報(bào)(自然科學(xué)版);2008年11期

相關(guān)會(huì)議論文 前10條

1 李明;朱圓;韓迎朝;;基于扇區(qū)細(xì)分的三電平逆變器直接轉(zhuǎn)矩控制系統(tǒng)研究[A];第十七屆全國煤礦自動(dòng)化學(xué)術(shù)年會(huì)、中國煤炭學(xué)會(huì)自動(dòng)化專業(yè)委員會(huì)學(xué)術(shù)會(huì)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(xué)會(huì)、河北省計(jì)算機(jī)學(xué)會(huì)、河北省自動(dòng)化學(xué)會(huì)、河北省人工智能學(xué)會(huì)、河北省計(jì)算機(jī)輔助設(shè)計(jì)研究會(huì)、河北省軟件行業(yè)協(xié)會(huì)聯(lián)合學(xué)術(shù)年會(huì)論文集[C];2007年

3 王菲;王勇;傅e，

本文編號(hào)：2495782