摘要
冀北电网中,先后出现了变流器的非特征次谐波环流问题。某500 k V变电站变流器并联运行时发生了一次故障,以该故障为例,通过分析变流器故障录波数据,发现多台变流器并列运行容易发生非特征谐波环流。通过分析环流与变流器拓扑结构之间的关系,得出级联H桥多电平变流器更容易发生非特征谐波环流;然后,通过电磁暂态仿真复现了故障现象,仿真结果验证了所得结论的正确性。最后,提出了解决非特征次谐波环流的措施。
In Jibei power grid, non-characteristic harmonic circulating current appeared several times and a fault occurred in parallel converters in a 500 k V station. Taking this fault as an example, recorded fault data were analyzed, finding out non-characteristic harmonic circulating current existing in several parallel converters. Analysis of relationship between the problem and parallel converter topology indicated that the problem was liable to appear in cascaded H-bridge multilevel converters. Reappearance of the phenomenon was realized with electromagnetic transient simulation. Simulation results showed validity of the proposed conclusion. Finally, countermeasures were proposed to solve the problem.
出处
《电网技术》
EI
CSCD
北大核心
2016年第7期2169-2174,共6页
Power System Technology
基金
国家自然科学基金项目(51322701)~~
关键词
变流器
并列运行
非特征次谐波环流
电力电子
converter
parallel operation
non-characteristic harmonic circulating current
power electronics
