【摘要】：為解決傳統(tǒng)半橋型模塊化多電平換流器(MMC)無法限制直流故障電流的問題,提出一種改進型子模塊的MMC拓撲。與傳統(tǒng)半橋型子模塊拓撲不同,交流輸出端口增加了阻斷IGBT及其旁路吸收回路。本文首先分析改進型子模塊的工作原理,在此基礎(chǔ)上開展基于該子模塊的MMC的故障限流機理及其主要功率開關(guān)器件的電氣應(yīng)力的研究,并通過仿真算例對所提出的拓撲進行了驗證。仿真結(jié)果表明基于改進型子模塊的MMC拓撲在原有正常模式下不需要改變控制策略與調(diào)制策略,而在故障階段能夠迅速實現(xiàn)故障電流阻斷效果,通過引入旁路吸收回路,進一步降低了對電路觸發(fā)脈沖一致性的要求,因此在未來高壓直流輸電系統(tǒng)領(lǐng)域具有良好的工程應(yīng)用前景。
[Abstract]:In order to solve the problem that the traditional half-bridge modularized multilevel converter (MMC) can not limit the DC fault current, an improved MMC topology of sub-module is proposed. Different from the traditional semi-bridge sub-module topology, the AC output port increases the blocking of IGBT and its bypass absorption circuit. In this paper, the working principle of the improved sub-module is analyzed, and the fault current limiting mechanism and the electrical stress of the main power switch devices based on the sub-module are studied. The proposed topology is verified by a simulation example. The simulation results show that the MMC topology based on the improved submodule does not need to change the control strategy and modulation strategy in the original normal mode, but can quickly realize the fault current blocking effect in the fault stage. The requirement of circuit trigger pulse consistency is further reduced, so it has a good application prospect in the field of HVDC transmission system in the future.
【作者單位】： 北京交通大學(xué)電氣工程學(xué)院;
【基金】：大型電氣傳動系統(tǒng)與裝備技術(shù)國家重點實驗室項目(SKLLDJ042016005) 國家重點研發(fā)計劃(2016YFE0131700)資助
【分類號】：TM46

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