西南交通大学学报2017，Vol.52Issue(3)：439-449,11.DOI:10.3969/j.issn.0258-2724.2017.03.002
基于电流极性和相对熵的广域继电保护新算法
New Algorithm of Wide-Area Protection Based on Current Polarity and Energy Relative Entropy
摘要
Abstract
In order to improve the fault tolerance and sensitivity of wide-area relay protection,a new algorithm of wide-area relay protection based on current polarity and energy relative entropy was proposed.It combines bus-bar sampling value protection with differential protection principle for fault component of lines.Firstly,the protection correlative domain of line IED was divided,so that the fault component currents of positive sequence frequency were extracted accurately according to different correlative domains.Meanwhile,the concepts of boundary current,synthetic calculated current and synthetic virtual current were presented.Secondly,the energy relative entropy of the synthetic current sample was defined to quantify the difference of the synthetic current.At the same time,the angle between the boundary currents of the correlative domain was calculated to characterize the polarity relation of the boundary current,and the correlation between the current sample energy entropy and the polarity relation was utilized to identify the inner and outer faults of the correlative domain.Finally,utilizing IEEE 3-machine and 9-bus system constructed by the software of PSCAD/EMTDC,different fault types were set at different fault points to test eh algorithm performance.The results reveal that when fault occurs in the correlative domain,the synthetic current is almost the same,with the relative entropy being very small,close to 0,and the angle between the boundary currents is less than π/2 with approximate polarity.When the fault is outside the domain,the synthetic current waveform is significantly different from sampling value,with the relative entropy larger than 1,and the angle between the boundary currents is close to π,with nearly opposite polarity.The distinction between the faults inside and outside the domain is obvious.Simulation results show that when single-phase earth fault occurs in the domain,the maximum relative entropy is 0.428 and the maximum angle is 0.388 in the condition of high resistance of 800 Ω,which still meets the reliable criterion and has high sensitivity.The experimental results verify that the algorithm performance is basically not affected by the transition resistance,and can overcome the influence of unfavorable factors such as TA saturation and data distortion.关键词
广域继电保护/边界电流极性/综合电流/采样值能量相对熵/故障识别Key words
wide-area relay protection/boundary current polarity/synthetic current/energy relative entropy of sampling values/fault identification分类
交通工程引用本文复制引用
吴浩,李群湛,刘炜..基于电流极性和相对熵的广域继电保护新算法[J].西南交通大学学报,2017,52(3):439-449,11.基金项目
本文的研究工作得到人工智能四川省重点实验室项目(2013RYY01,2012RYY06,2014RYY05,2015RYY01)的资助. （2013RYY01,2012RYY06,2014RYY05,2015RYY01）
