摘要
在500 kVA超导储能系统研制中,为了选择合适的功率变换电路拓扑,使系统具有更高的电压等级和灵活性,比较了近年来国内外采用的几种电压型换流器。针对超导储能特点及其在电力系统中承担电能质量调节的要求,分析了传统2电平桥式换流电路、中点钳位型多电平换流电路以及级联型多电平换流电路的性能。分析结果表明,对于大功率超导储能装置,级联型多电平换流电路在电压等级、控制精度及结构灵活等方面均优于另外2种换流器拓扑,采用级联型换流器的超导储能系统实现了模块化构造,可以实现系统冗余及容错运行。仿真结果证实模块化超导储能系统能够在较低工作频率下精确控制电压质量。
In the research of large scale super-conductive magnetic energy storage system （SMES）, the voltage sourced converters were discussed to choose the suitable power conversion circuit which is more flexible and reliable. The characteristics and structures of 2-level bridge converters, neutral point clamped multi-level converters and cascaded multi-level converters were analyzed. The results show that the cascaded multi-level converters have higher voltage grade and control precision than the other converters when applied to SMES system, and can operate in redundant and error tolerating mode. Computer simulation approved that the modularized SMES system can compensate power line voltage and eliminate harmonics under lower frequency.
出处
《中国电力》
CSCD
北大核心
2006年第4期7-10,共4页
Electric Power
基金
国家杰出青年科学基金资助项目(50225723)
关键词
超导储能
大功率换流器
级联型多电平电路
灵活交流输电系统
super-conductive magnetic energy storage （SMES）
large scale voltage sourced converter
cascade multilevel circuit
FACTS
