基于多时段同步测量信息的T接线路参数在线测量

Online Measurement of T-Connection Transmission Line Parameters Based on Multi-Interval Synchronized Measurement Information

线路参数的准确测量对电力系统状态估计、潮流计算和网损分析等都很重要。本文针对含T接线路的参数在线测量问题展开研究,推导了一种线路参数在线测量算法。该方法通过分析含T接线路的等效电路,利用T接线多时段同步测量信息结合线路模型列写方程组,进行两次迭代计算求解方程组,最终得出含T接线路的各段线路参数值。为了克服电网频率波动对测量结果准确度的影响,推导了一种加窗插值傅里叶算法,用于分析同步采样数据。文中给出了对所提测量方法的仿真验证结果,最后介绍了利用该方法对某T接线路进行在线测量的情况,给出了在线测量结果,并与设计值进行了对比。仿真结果与实测结果均表明该在线测量方法是可行的,测量结果准确,能够满足工程测量要求。

Accurate transmission parameters are very important for state estimation, power flow computation and network losses analysis. The research work around online measurement of T-connection transmission line parameters was launched. An online measurement algorithm of transmission line was proposed. The equations were listed by analyzing the equivalent circuit of T-connection transmission line and using multi-interval synchronized Information of the T-connection transmission line. Then, by solving the equations iteratively, the parameters of the transmission line can be calculated. In order to reduce the measurement error due to the waving of electric network frequency, a windowed interpolation FFT algorithm was proposed to analysis the synchronized sampling data. In this paper, the simulation results of the proposed method are given. Finally, the online measurement process of one 110 kV transmission line containing T-connection lines by the proposed method are described, the online measurement results are given and compared with the design values. Results from both simulation and online measurement show that the proposed online measurement method is feasible and its requirements of engineering measurement.