MMC-HVDC的稳态运行范围研究  

Steady-State Operating Range of MMC-HVDC

作　　者：张静[1] 孙维真[1] 费建平 刘明康 张哲任[3] 徐政[3] 

机构地区：[1]浙江省电力公司,杭州市310007 [2]舟山市电力公司,浙江省舟山市316021 [3]浙江大学电气工程学院,杭州市310027

出　　处：《电力建设》2015年第3期1-6,共6页Electric Power Construction

基　　金：国家高技术研究发展计划项目(863计划)(2012AA050205)~~

摘　　要：针对基于模块化多电平换流器的高压直流输电系统(modular multilevel converter based high voltage direct current,MMC-HVDC),研究了交流系统对MMC-HVDC稳态运行范围的影响并且揭示了限制直流功率输送能力的关键因素。首先,文章基于一个单端的MMC-HVDC系统,列写出完整的数学模型。其次,分别研究了交流系统短路比、换流变压器容量和换流站容量对换流站稳态运行范围的影响。最后,研究了并联无功补偿电容器对MMC-HVDC运行范围的影响。计算结果表明,当交流系统短路比较大时,MMC-HVDC的运行范围主要受到换流变压器容量的限制;当交流系统短路比较小时,MMC-HVDC的运行范围主要受到交流系统短路比的限制。此外,无功补偿电容能改善MMCHVDC的运行范围。This paper studied the influence of AC system On the operating range of MMC-HVDC （ modular multilevel converter-high voltage direct current） under steady-state condition, and analyzed the key factors to limit the DC power transmission capacity. Firstly, the equivalent mathematical model of a one-terminal MMC-HVDC was derived. Secondly, the impacts of the short circuit ratio （SCR） of AC system, the capacities of converter transformer and converter station on the steady-state operating range of converter station were studied. Lastly, this paper analyzed the influence of the parallel reactive power compensator on the operating range of MMC-HVDC. The calculation results show that： the operating range of MMC-HVDC is mostly limited by the converter transformer capacity under large SCR of AC system; while the operating range is largely depended on the value of SCR under small SCR. Additionally, the use of reactive power compensator can improve the operating range of MMC-HVDC.

关 键 词：模块化多电平换流器(MMC) 柔性直流输电 稳态运行范围 交流系统短路比 无功补偿器 换流变压器容量 

分 类 号：TM464[电气工程—电器]