电力系统自动化Issue(16)：115-119,150,6.DOI:10.7500/AEPS20141113026
基于虚拟电流波形特征的母线保护原理
An Algorithm Based on Virtual Current for Bus-bar Protection
摘要
Abstract
Sample value differential protection has the advantage of being capable of making the differential protection characteristic work by directly using the instantaneous sample value,which requires less calculation and operation time,but it has the disadvantage of easily being affected by interference and its reliability should be studied.In order to solve this problem, an algorithm based on virtual current for bus-bar protection is proposed based on the research achievement in the sample value differential protection.By merging the sampling values of the branch fault component currents of the bus-bar of the same moment and in the same direction,the bus-bar system is simplified into two virtual currents.Based on the waveform differential attribute of the virtual currents in different bus-bar operating modes,the differences are quantitatively analyzed using the correlation analytic technique.By calculating the correlation coefficients of sampled current values and utilizing their distribution characteristics,the external and internal faults can be correctly distinguished.Results of theoretical analysis and simulation have proved that the proposed criterion is capable of rapidly and reliably distinguishing internal fault from external fault,while insensitive to current transformer(TA) saturation to a definite extent.关键词
虚拟电流/母线保护/采样值差动保护/相关度/电流互感器饱和/故障分量Key words
virtual current/bus-bar protection/sample-value differential protection/correlation coefficient/current transformer saturation/fault component引用本文复制引用
李肖博,谭凌,揭萍,郝后堂..基于虚拟电流波形特征的母线保护原理[J].电力系统自动化,2015,(16):115-119,150,6.基金项目
国家科技支撑计划资助项目(2012BAA15G00)。This work is supported by National Key Technologies R&D Program (No.2012BAA15G00) （2012BAA15G00）
