【摘要】：多模塊并聯(lián)運(yùn)行技術(shù)是變流器向大功率發(fā)展的一項(xiàng)關(guān)鍵技術(shù),具有實(shí)現(xiàn)擴(kuò)大容量,提高冗余度以及提高可靠性等優(yōu)點(diǎn),近年來因?yàn)閼?yīng)用前景廣闊而成為研究熱點(diǎn)。而隨著PWM變流器技術(shù)的發(fā)展,已設(shè)計(jì)出了多種PWM整流器拓?fù)浣Y(jié)構(gòu),對(duì)于變流器模塊化設(shè)計(jì),變流器的效率,模塊化設(shè)計(jì)難度是制約變流器拓?fù)溥x擇的關(guān)鍵因素。相比傳統(tǒng)的兩電平變流器,三電平變流器因?yàn)楣β势骷蛪旱燃?jí)低、開關(guān)損耗低以及諧波含量低等優(yōu)點(diǎn),在中高壓場(chǎng)合得到了廣泛的應(yīng)用,多模塊并聯(lián)運(yùn)行主要存在環(huán)流抑制問題,三電平變流器存在中點(diǎn)平衡控制問題。這些問題會(huì)對(duì)變流器及其并聯(lián)系統(tǒng)造成危害,因此,三電平變流器的并聯(lián)研究具有重要的意義。 本文主要從以下幾個(gè)方面進(jìn)行三電平變流器模塊化并聯(lián)技術(shù)的研究： (1)基于三相TNPC三電平變流器的基本工作原理,分析TNPC三電平變流器的SVPWM調(diào)制算法,實(shí)現(xiàn)了基于電壓定向并網(wǎng)控制策略,并進(jìn)行軟件仿真驗(yàn)證并網(wǎng)控制策略的可行性。 (2)分析三電平變流器并聯(lián)系統(tǒng)零序環(huán)流產(chǎn)生的原因,并研究TNPC三電平變流器并聯(lián)系統(tǒng)的環(huán)流抑制方法。針對(duì)基于SVPWM三電平變流器并聯(lián)系統(tǒng),研究其環(huán)流控制方法,通過仿真驗(yàn)證零序環(huán)流控制策略的可行性。 (3)分析基于SVPWM調(diào)制算法的三電平變流器中點(diǎn)平衡問題,研究中點(diǎn)平衡控制策略,采用分配因子的方法進(jìn)行中點(diǎn)平衡控制。結(jié)合三電平變流器并聯(lián)系統(tǒng)的環(huán)流抑制方法,研究兼容中點(diǎn)平衡的零序環(huán)流抑制的控制方法,進(jìn)行軟件仿真驗(yàn)證控制方法的可行性。 (4)搭建了TNPC三電平變流器并聯(lián)系統(tǒng)實(shí)驗(yàn)平臺(tái),進(jìn)行兩臺(tái)TNPC三電平變流器直接并聯(lián)實(shí)驗(yàn),驗(yàn)證兼容中點(diǎn)平衡的零序環(huán)流抑制控制策略的可行性。
[Abstract]:Multi-module parallel operation technology is a key technology for the development of converters to high power. It has the advantages of expanding capacity, increasing redundancy and improving reliability. In recent years, it has become a research focus because of its broad application prospects. With the development of PWM converter technology, a variety of PWM rectifier topologies have been designed. For the modular design of converters, the efficiency of converters, the difficulty of modular design is the key factor restricting the topology selection of converters. Compared with the traditional two-level converter, the three-level converter has been widely used in medium and high voltage because of its low voltage resistance, low switching loss and low harmonic content. Multi-module parallel operation mainly has the problem of circulation suppression, and the three-level converter has the problem of midpoint balance control. These problems will cause harm to the converter and its parallel system, so the research on the parallel connection of the three-level converter is of great significance. In this paper, the modularization and parallel technology of three-level converter is studied from the following aspects: (1) based on the basic working principle of three-phase TNPC three-level converter, the SVPWM modulation algorithm of TNPC three-level converter is analyzed. The voltage-oriented grid-connected control strategy is implemented, and the feasibility of the grid-connected control strategy is verified by software simulation. (2) the causes of zero-sequence circulation in three-level converter parallel system are analyzed, and the circulation suppression method of TNPC three-level converter parallel system is studied. Aiming at the parallel system based on SVPWM three-level converter, the circulation control method is studied, and the feasibility of zero-sequence circulation control strategy is verified by simulation. (3) the midpoint balance problem of three-level converter based on SVPWM modulation algorithm is analyzed, the midpoint balance control strategy is studied, and the midpoint balance control is carried out by using the method of distribution factor. Combined with the circulation suppression method of three-level converter parallel system, the control method of zero-sequence circulation suppression compatible with midpoint balance is studied, and the feasibility of the control method is verified by software simulation. (4) the experimental platform of TNPC three-level converter parallel system is built, and the direct parallel experiments of two TNPC three-level converters are carried out to verify the feasibility of zero-sequence circulation suppression control strategy compatible with midpoint balance.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 彭方正;錢照明;羅吉蓋斯;賴澤生;;現(xiàn)代多電平變流器的工業(yè)應(yīng)用和技術(shù)展望[J];變流技術(shù)與電力牽引;2007年05期

2 馬小亮;魏學(xué)森;;西門子的優(yōu)化三電平PWM信號(hào)生成方法[J];變頻器世界;2010年01期

3 姜衛(wèi)東;王群京;李爭(zhēng);王智;陳權(quán);;中點(diǎn)電壓偏移對(duì)SVM控制的三電平逆變器的影響及補(bǔ)償措施[J];電工技術(shù)學(xué)報(bào);2006年09期

4 馬琳;孫凱;Remus Teodorescu;金新民;;高效率中點(diǎn)鉗位型光伏逆變器拓?fù)浔容^[J];電工技術(shù)學(xué)報(bào);2011年02期

5 鄧菊蓮;崔海昱;王志剛;龍維緒;;第三代太陽電池技術(shù)[J];太陽能;2008年03期

6 金舜,鐘彥儒,明正峰,王建淵;一種控制中點(diǎn)電位并消除窄脈沖的三電平PWM方法[J];中國電機(jī)工程學(xué)報(bào);2003年10期

7 林磊,鄒云屏,鐘和清,鄒旭東,丁凱;二極管箝位型三電平逆變器控制系統(tǒng)研究[J];中國電機(jī)工程學(xué)報(bào);2005年15期

8 宋文祥;陳國呈;武慧;孫承波;;一種具有中點(diǎn)電位平衡功能的三電平空間矢量調(diào)制方法及其實(shí)現(xiàn)[J];中國電機(jī)工程學(xué)報(bào);2006年12期

9 張興;邵章平;王付勝;劉萍;任康樂;;三相三電平模塊化光伏并網(wǎng)系統(tǒng)的零序環(huán)流抑制[J];中國電機(jī)工程學(xué)報(bào);2013年09期

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