基于apFFT频谱校正和XGBoost的风电场集电线路单相接地故障测距  

Single Phase Grounding Fault Location for Power Lines of Wind Farm Based on apFFT Spectrum Correction and XGBoost Algorithm

作　　者：彭华 朱永利[1] Peng Hua;Zhu Yongli(School of Electrical and Electronic Engineering North China Electric Power University,Baoding 071003 China)

机构地区：[1]华北电力大学电气与电子工程学院,保定071003

出　　处：《电工技术学报》2020年第23期4931-4939,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51677072)。

摘　　要：针对风电场集电线路因短路故障造成的弃风窝电问题,提出采用全相位快速傅里叶变换(apFFT)频谱校正和极限梯度提升(XGBoost)的风电场集电线路单相接地故障测距方法。首先,搭建双馈风电场多分支混合线路的仿真模型,并通过apFFT频谱校正法获取故障电压和电流的基波相量,以构建原始特征集;然后,采用XGBoost算法建立单端故障测距的回归模型,并计算获取故障特征的重要度及排序,直观地挖掘特征量与故障距离之间的关系;最后,应用XGBoost故障定位器根据现存模态完成对新输入模态的定位,获得故障点精确位置。PSCAD/EMTDC实验证明,该方法对风电场多分支、混合短线路测距具有明显优势,定位性能优于随机森林(RF)方法,且不受故障位置、过渡电阻的影响,可满足风电场对测距精度的需求。Aiming at the problem relating to electricity transmission stopping and wind power abandonment caused by any short circuit in a power line of a wind farm,a single phase grounding fault location method based on all phase fast fourier transform(apFFT)spectrum correction and extreme gradient boosting(XGBoost)for the measured signals of the faulted line is proposed.During the research,the simulation models of doubly fed generators with multi branch hybrid power lines in a wind farm is firstly constructed,and the fundamental phasors of relating voltages and currents during a fault period are obtained by apFFT spectrum correction method to build an original feature set.Then the regression model on single terminal fault location is established by an algorithm called as XGBoost,and the model contains the feature importance and sorting of the fault and can be used to discover the relationship between the features and the fault distance.Finally the fault location can be estimated using the model based on the current input pattern.The experimental results by PSCAD/EMTDC show that the proposed method has distinct advantages in the fault location of a short overhead/cable hybrid line with multibranches in a wind farm.Its fault location performance is better than random forest(RF)algorithm,and not affected by fault location and grounding resistance.It can meet the fault location accuracy requirement of a wind farm.

关 键 词：风电场集电线路 apFFT频谱校正 极限梯度提升 单相接地故障 单端故障测距 特征重要度 

分 类 号：TM77[电气工程—电力系统及自动化]