含桥臂阻尼的MMC-HVDC直流双极短路故障机理分析

发布时间：2018-05-24 23:31

本文选题：模块化多电平换流器 + 柔性直流输电　；参考：《电网技术》2017年07期

【摘要】：直流双极短路故障是柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)系统最严重的故障之一。具有桥臂阻尼的半桥型模块化多电平换流器在故障后能加快故障电流的衰减速度,实现系统快速重启动。基于含桥臂阻尼的HBMMC(half bridge sub-module modular multilevel converter)-HVDC系统建立了一套完整的直流双极短路故障机理分析的解析模型,分别对换流器闭锁前,换流器闭锁后和交流断路器断开后3个阶段的故障机理进行了详细分析,并给出了每个阶段对应的桥臂电流解析表达式。通过此解析模型,可快速准确地计算直流双极短路故障发生后的故障电流及故障衰减时间,为其工程应用提供理论依据。最后,基于Matlab/Simulink仿真软件搭建了含桥臂阻尼的HBMMC-HVDC系统仿真模型,通过仿真验证了该解析模型的可行性与准确性。
[Abstract]:DC bipolar short circuit fault is one of the most serious faults in the voltage source converter based high voltage direct current, VSC-HVDC system. The half bridge modular multilevel converter with bridge arm damping can accelerate the failure and deceleration of the fault current after the fault, and realize the rapid restart of the system. Based on the bridge arm resistance The HBMMC (half bridge sub-module modular multilevel converter) -HVDC system has established a complete set of analytical models for the analysis of the fault mechanism of the DC bipolar short circuit. The fault mechanism of the 3 stages after the interlocking of the converter, the interlock and the interrupting of the AC circuit breaker are analyzed in detail, and each stage is given. The analytical expression of the bridge arm current should be expressed. Through this analytical model, the fault current and the failure time of the DC bipolar short-circuit fault can be quickly and accurately calculated. The theoretical basis for its engineering application is provided. Finally, a simulation model of the HBMMC-HVDC system with bridge arm resistance to Nepal is built based on the Matlab/Simulink simulation software. The feasibility and accuracy of the analytical model are proved.
【作者单位】：西安许继电力电子技术有限公司;许继集团有限公司;国网山东省电力公司电力科学研究院;
【基金】：国家科技重大专项(2015ZX02301003)~~
【分类号】：TM721.1

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