常规直流输电系统改造用的混合直流输电技术Study on Hybrid HVDC Transmission Technology Used for Upgrading of Conventional HVDC Transmission System
许烽;宣晓华;江道灼;黄晓明;虞海泓;陆翌;裘鹏;
摘要(Abstract):
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。
关键词(KeyWords): 常规直流;混合直流;电网换相换流器;模块化多电平换流器;改造
基金项目(Foundation):
作者(Author): 许烽;宣晓华;江道灼;黄晓明;虞海泓;陆翌;裘鹏;
Email:
DOI: 10.13335/j.1000-3673.pst.2017.0161
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