摘要
配电网高阻接地故障通常伴随着非线性电弧的产生。传统的固定电阻模型无法模拟电弧的非线性;微分形式的电弧模型依赖于参数的迭代,难以直接应用于相关的故障检测及测距算法中;对数电弧模型较为复杂,按级数展开时易发散。人工模拟此类故障获取实验数据的方法成本高、危险性大且具有一定的局限性。基于汤逊原理,建立了能够表征动态电弧非线性特征的指数电弧模型及其简化模型,并结合PSCAD仿真软件及现场数据验证了模型的有效性。针对该电弧模型无法表征电弧电压、电流间相角差的不足,进一步提出了数据修正算法,为后续弧光高阻接故障的研究提供了更为精确的数据支撑。
High resistance grounding faults in distribution networks are usually accompanied by nonlinear arcs.The traditional fixed resistance model cannot simulate the nonlinearity of the arc.The arc model with differential form relies on the iteration of the parameters,which is difficult to be directly applied to the related fault detection and ranging algorithms.The logarithmic arc model is more complicated and tend to diverge when expanded in series.The method of artificially simulating such faults to obtain experimental data is costly,risky and has certain limitations.Based on the Thompson principle,an exponential arc model and the simplified model are established to describe the nonlinear characteristics of dynamic arcs.The validity of the model is verified by PSCAD and field data.Aiming at the deficiency that the arc model can not represent the phase angle difference between arc voltage and current,a data correction algorithm is proposed to provide more accurate data support for the follow-up research on arc high resistance grounding faults.
作者
邵庆祝
崔鑫
谢民
王同文
王海港
王宾
SHAO Qingzhu;CUI Xin;XIE Min;WANG Tongwen;WANG Haigang;WANG Bin(State Grid Anhui Electric Power Co.,Ltd.,Hefei 230061,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2021年第11期120-125,共6页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2017YFB0902800)。
关键词
配电网
弧光高阻接地
非线性电弧
汤逊原理
数据修正
distribution network
arc high resistance grounding
nonlinear arc
Thompson principle
data correction
