基于单端暂态电流的MMC-HVDC输电线路保护方案研究

发布时间：2018-06-17 14:00

本文选题：模块化多电平换流器高压直流输电系统 + 保护方案　；参考：《中国电机工程学报》2017年17期

【摘要】：高效可靠的直流线路保护是模块化多电平换流器高压直流输电(high voltage direct current transmission based on modular multilevel converter,MMC-HVDC)系统安全经济运行的重要保证。为了快速检测直流输电线路故障并识别故障类型,该文提出一种基于单端暂态电流的MMC-HVDC直流输电线路保护方案。当直流输电线路发生故障时,线路保护安装处电流频率成分丰富,基于经验模态分解的时频局部化特性,利用固有模态能量熵评估电流能量在频域分布的离散度,构建直流侧故障判据,以区分交流侧和直流侧故障。直流线路电流在直流线路双极短路、单极接地和断线故障时分别对应上升、平稳和下降趋势,利用滑动平均滤波提取电流变化趋势,构造了故障类型识别判据。RTDS仿真结果表明,该方案在不同故障位置和过渡电阻下均能够快速可靠地检测直流线路故障并准确识别故障类型。
[Abstract]:Efficient and reliable DC line protection is an important guarantee for the safe and economical operation of high voltage direct current transmission based on modular multilevel convertor MMC-HVDC (high voltage DC) system with modularized multilevel converter. In order to detect DC transmission line faults and identify fault types, this paper presents a MMC-HVDC HVDC line protection scheme based on single-terminal transient current. When the DC transmission line fails, the current frequency component in the line protection installation is rich. Based on the time-frequency localization characteristic of empirical mode decomposition, the dispersion of current energy distribution in frequency domain is evaluated by using the inherent mode energy entropy. The DC side fault criterion is constructed to distinguish AC side fault from DC side fault. The current of DC line is rising, steady and decreasing respectively when the DC line is bipolar short circuit, monopole ground fault and break line fault. The trend of current change is extracted by sliding average filter, and the fault type identification criterion is constructed. RTDS simulation results show that, The scheme can quickly and reliably detect DC line faults and accurately identify fault types under different fault locations and transition resistors.
【作者单位】：上海交通大学电气工程系;
【基金】：国家自然科学基金项目(51377104,51407115) 国家重点研发计划(2016YFB0900601)~~
【分类号】：TM75;TM773

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