本文選題：常規(guī)直流 + 混合直流�。� 參考：《電網(wǎng)技術(shù)》2017年10期

【摘要】：基于電網(wǎng)換相換流器(line commutated converter,LCC)和電壓源型換流器(voltage source converter,VSC)的混合直流輸電技術(shù)結(jié)合了LCC的經(jīng)濟(jì)優(yōu)勢和VSC的技術(shù)優(yōu)勢。該文針對常規(guī)直流工程改造,首先給出了受端LCC改造成真雙極和偽雙極VSC兩種主回路拓?fù)浣Y(jié)構(gòu),并對兩者的工程改造范圍和工程改造量進(jìn)行了對比分析,指出了真雙極和偽雙極結(jié)構(gòu)作為改造拓?fù)涞膬?yōu)缺點(diǎn)。然后,通過對國內(nèi)外模塊化多電平換流器(modular multilevel converter,MMC)拓?fù)浼捌渥兘Y(jié)構(gòu)拓?fù)涞恼{(diào)研,詳細(xì)研究了5類MMC優(yōu)化拓?fù)浣Y(jié)構(gòu)在直流故障清除、送端交流故障功率不間斷、低電壓運(yùn)行、潮流反轉(zhuǎn)等方面的技術(shù)特性以及在改造成本、運(yùn)行損耗等經(jīng)濟(jì)方面的優(yōu)劣性,并直觀地對比總結(jié)了5類MMC優(yōu)化拓?fù)涞木C合特性,為未來MMC技術(shù)在常規(guī)直流輸電系統(tǒng)受端換流閥改造中的應(yīng)用提供了技術(shù)參考。
[Abstract]:The hybrid DC transmission technology based on line commutated converter and voltage source converter (VSC) combines the economic advantages of LCC and the technical advantages of VSC. Aiming at the transformation of conventional DC engineering, this paper first presents the topology structure of the main loop transformed from LCC to true bipolar and pseudo-bipolar VSC, and makes a comparative analysis of the scope of engineering transformation and the quantity of engineering transformation. The merits and demerits of true bipolar and pseudo-bipolar structures as modified topologies are pointed out. Then, through the investigation of modularized multilevel convertor MMC topology and its variable structure topology at home and abroad, this paper studies in detail five kinds of MMC optimized topologies in DC fault removal, AC fault power uninterrupted, low voltage operation. The technical characteristics of power flow reversal and the advantages and disadvantages of the transformation cost, operation loss and other economic aspects are compared and summarized intuitively, and the comprehensive characteristics of five kinds of MMC optimization topology are compared and summarized intuitively. It provides a technical reference for the application of MMC technology in the transformation of the receiving end converter valve of the conventional HVDC transmission system in the future.
【作者單位】： 國網(wǎng)浙江省電力公司電力科學(xué)研究院;浙江大學(xué)電氣工程學(xué)院;國網(wǎng)浙江省電力公司湖州供電公司;
【分類號】：TM721.1

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