發(fā)布時(shí)間：2018-04-28 04:21

  本文選題：模塊化多電平換流器 + 新型子模塊��； 參考：《東北電力大學(xué)》2017年碩士論文

【摘要】：模塊化多電平換流器(MMC)憑借諸多優(yōu)點(diǎn)在柔性直流輸電領(lǐng)域發(fā)展十分迅速。當(dāng)應(yīng)用于遠(yuǎn)距離高壓直流輸電時(shí),由半橋型子模塊(HBSM)構(gòu)成的傳統(tǒng)MMC在直流側(cè)發(fā)生故障時(shí)雖然可以閉鎖所有絕緣柵雙極型晶體管(IGBT)實(shí)現(xiàn)對器件的保護(hù),然而因?yàn)镮GBT并聯(lián)續(xù)流二極管,造成短路電流不能被閉鎖,從而使其不具備直流側(cè)故障清除能力。針對傳統(tǒng)半橋型子模塊無法清除直流側(cè)故障的問題,許多具備直流故障阻斷功能的新型子模塊相繼被提出,相比半橋型子模塊,這些新型子模塊增加了額外的阻斷器件,從而在電平數(shù)較多的情況下增加了換流器的損耗。本文首先對MMC的基本原理做了簡要介紹,其次,在研究了現(xiàn)有的具備直流故障自動(dòng)清除能力的新型MMC子模塊之后,對其做了改進(jìn),提出了一種具備三電平輸出能力且具備較強(qiáng)故障阻斷功能的新型子模塊,并將新型子模塊拓?fù)浣Y(jié)構(gòu)與傳統(tǒng)半橋子模塊結(jié)合構(gòu)成橋臂混合子模塊式換流器,以降低由新型子模塊構(gòu)成的換流器所帶來的額外損耗問題。并分析了混合式換流器的調(diào)制策略以及交流電壓階梯波的諧波特性,且通過PSCAD/EMT DC仿真平臺(tái)進(jìn)行了仿真驗(yàn)證。針對基于循環(huán)嵌套機(jī)理的MMC(NLMMC)的優(yōu)越性,本文提出了一種具備直流故障阻斷能力且損耗較低的混合子模塊,應(yīng)用到基于循環(huán)嵌套機(jī)理的MMC之后,使新型換流器在具有直流側(cè)故障阻斷能力的基礎(chǔ)上,提高了電平輸出能力,從而間接地減少了換流器的損耗。文章從該拓?fù)浣Y(jié)構(gòu)的工作原理入手,對新型換流器的故障阻斷機(jī)理和調(diào)制策略進(jìn)行了分析,提出了分層電壓平衡控制策略。最后通過PSCAD/EMTDC仿真平臺(tái)搭建了仿真模型,對換流器的電平輸出能力以及故障阻斷能力進(jìn)行了仿真驗(yàn)證。
[Abstract]:Modularized multilevel converter (MMC) is developing rapidly in the field of flexible DC transmission by virtue of many advantages. When it is applied to long distance HVDC transmission, the traditional MMC composed of half bridge module (HBSM) can protect the device even though it can lock all insulated gate bipolar transistors (IGBT) when the DC side fails. However, the short circuit current can not be locked because of the IGBT parallel current diode, so it does not have DC side fault clearance capability. In view of the problem that the traditional semi-bridge sub-module can not clear the DC side fault, many new sub-modules with DC fault blocking function have been proposed one after another. Compared with the half-bridge sub-module, these new sub-modules have added additional blocking devices. Thus, the loss of converter is increased when the number of level is more. In this paper, the basic principle of MMC is introduced briefly. Secondly, after studying the existing new MMC submodule with DC fault automatic clearing capability, the paper improves it. A new type of sub-module with three-level output capability and strong fault blocking function is proposed. The topology of the new sub-module is combined with the traditional half-bridge sub-module to form a hybrid sub-module converter. To reduce the extra loss caused by the converter made up of new submodules. The modulation strategy of the hybrid converter and the harmonic characteristics of the AC voltage step wave are analyzed, and the simulation results are verified by the PSCAD/EMT DC simulation platform. Aiming at the superiority of MMC based on cyclic nesting mechanism, this paper presents a hybrid submodule with DC fault blocking capability and low loss, which is applied to MMC based on cyclic nesting mechanism. On the basis of DC side fault blocking capability, the new converter can improve the level output ability, thus indirectly reducing the converter loss. Based on the working principle of the topology, this paper analyzes the fault blocking mechanism and modulation strategy of the new converter, and puts forward a layered voltage balance control strategy. Finally, the simulation model is built on the PSCAD/EMTDC simulation platform, and the level output capability and the fault blocking ability of the converter are verified by simulation.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1;TM46

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本文編號(hào)：1813739