基于PMU的输电线路参数识别在南方电网的实时应用（英文）

Real-Time Implementation of PMU-based Transmission Line Parameter Identification at China Southern Power Grid

传统的线路阻抗参数计算方法实质上是一种近似方法,只是估计了线路的长度和弧垂,但忽略了气温变化对线路参数的影响。近年来相量测量单元技术的发展使得利用PMU更精确地计算线路阻抗参数成为可能。随着电网系统中安装了越来越多的PMU,南方电网开发并实施了一套基于相量测量单元的电力线路阻抗参数在线计算系统TPIS,用以更新能量管理系统数据库中的线路阻抗参数。TPIS创新性地提出了一种利用PMU进行电力线路参数在线计算的方法。该方法对现有方法进行了改进,在利用EMS中线路参数时考虑了参数误差,同时增加了物理性约束条件,从而使得该方法能够应对目前实际系统不同运行状态下PMU数据精度的不确定性,解决了对高精度PMU数据的依赖。此外,TPIS通过对在线获取的PMU数据进行多次重复采样,并对多次采样的计算结果进行统计学分析,提出了一种可以用来评估计算结果可信度的指标。

Traditional transmission line（ TL） parameters calculation method is essentially an approximate method,and the parameters only approximate the effect of conductor sag and the length of TL,while ignore the influence of temperature variation on impedance parameters. Recent development in PMU technology has made it possible to calculate TL parameters accurately. With a large number of PMUs widely installed in its system,CSG developed an online PMU-based TL parameter identification system（ TPIS） to improve and update the EMS database. TPIS provides an innovative and practical problem formulation and solution for TL parameter identification. Physical constraints of power system transmission lines are added into the optimizaion formulation so that this method can cope with the uncertainty of PMU measurements accuracy under different working / system conditions,and it solves reliance on the accurate PMU data. In addition,by sampling online PMU data many times,the calculated parameters using the multiple sampling data are analyzed statistically. A novel metrics to evaluate the credibility of the results are developed and tested.