基于主动脉冲的MMC-HVDC单极接地故障测距

发布时间：2018-06-15 10:02

本文选题：模块化多电平柔性直流输电 + 故障测距　；参考：《电工技术学报》2017年01期

【摘要】：准确可靠的故障测距技术对模块化多电平柔性直流输电系统(MMC-HVDC)故障恢复至关重要。通过分析MMC子模块控制特性,提出基于子模块控制的MMC主动式脉冲产生原理,进而通过检测脉冲发出时间和反射脉冲到达监测点的时间,提出基于主动式脉冲的MMC-HVDC单极接地故障测距方法。针对脉冲到达时刻的精确检测问题,采用基于二分递推奇异值分解(SVD)的脉冲到达时刻检测方法;进一步利用主动式脉冲方法进行在线波速的测定,最后给出了MMC-HVDC主动式脉冲故障测距的流程。该主动式脉冲单端测距方法利用换流器子模块产生脉冲,不需要额外增加设备,并且不受过渡电阻影响,可多次进行测量,提高了故障检测的准确度和可靠性。仿真结果表明单端主动式脉冲测距方法能够对MMC-HVDC线路的单极接地故障进行准确定位,提高了单端测距的可靠性和准确度。
[Abstract]:Accurate and reliable fault location technology is very important to the recovery of MMC-HVDC system. By analyzing the control characteristics of MMC submodule, the principle of MMC active pulse generation based on submodule control is proposed, and then the time of pulse sending and the time of reflection pulse reaching monitoring point are detected. A MMC-HVDC single-pole fault location method based on active pulse is proposed. Aiming at the accurate detection of pulse arrival time, a method based on binary recursive singular value decomposition (SVD) is used to detect the pulse arrival time, and the active pulse method is used to measure the velocity of the pulse on line. Finally, the flow chart of MMC-HVDC active pulse fault location is given. The active pulse single-terminal ranging method uses the converter sub-module to generate the pulse, which does not need additional equipment, and is not affected by the transition resistance, and can be measured many times, thus improving the accuracy and reliability of fault detection. The simulation results show that the single-ended active pulse ranging method can accurately locate the single-pole grounding fault of MMC-HVDC line, and improve the reliability and accuracy of single-ended location.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家重点基础研究发展计划(973计划)(2012CB215206) 高等学校学科创新引智计划(B08013)资助项目
【分类号】：TM721.1

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