常规直流输电系统改造用的混合直流输电技术

发布时间：2018-05-25 20:46

本文选题：常规直流 + 混合直流　；参考：《电网技术》2017年10期

【摘要】：基于电网换相换流器(line commutated converter,LCC)和电压源型换流器(voltage source converter,VSC)的混合直流输电技术结合了LCC的经济优势和VSC的技术优势。该文针对常规直流工程改造,首先给出了受端LCC改造成真双极和伪双极VSC两种主回路拓扑结构,并对两者的工程改造范围和工程改造量进行了对比分析,指出了真双极和伪双极结构作为改造拓扑的优缺点。然后,通过对国内外模块化多电平换流器(modular multilevel converter,MMC)拓扑及其变结构拓扑的调研,详细研究了5类MMC优化拓扑结构在直流故障清除、送端交流故障功率不间断、低电压运行、潮流反转等方面的技术特性以及在改造成本、运行损耗等经济方面的优劣性,并直观地对比总结了5类MMC优化拓扑的综合特性,为未来MMC技术在常规直流输电系统受端换流阀改造中的应用提供了技术参考。
[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.
【作者单位】：国网浙江省电力公司电力科学研究院;浙江大学电气工程学院;国网浙江省电力公司湖州供电公司;
【分类号】：TM721.1

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