变流器并列运行系统中非特征谐波环流分析及其抑制方法  

Analysis on Non-Characteristic Harmonic Circulating Current in Parallel Inverter System and Its Suppression Measures

作　　者：胡应宏[1] 邓春[1] 王劲松[1] 李雨[1] 谢小荣[2] 刘少宇 刁嘉 任佳佳[5] 

机构地区：[1]华北电力科学研究院有限责任公司,北京市西城区100045 [2]清华大学电机系,北京市海淀区100084 [3]国网冀北电力有限公司,北京市西城区100045 [4]国网新源张家口风光储示范电站有限公司,河北省张家口市075001 [5]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001

出　　处：《电网技术》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)~~

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.

关 键 词：变流器 并列运行 非特征次谐波环流 电力电子 

分 类 号：TM46[电气工程—电器]