利用非全相运行故障录波数据的线路参数计算

Calculation of Line Parameters by Using Fault Recording Data of Non-All Phase Operation

针对采用单相重合闸的特/超高压输电线路,提出了一种利用重合闸期间非全相运行故障录波数据的线路参数时域计算方法。对于非故障线路,正序、零序参数分别选择线模及零模集中参数模型进行计算。对于故障线路,正序参数选择非故障相相间线模集中参数模型进行计算。若二次电弧未熄灭,选择三相耦合线路模型计算故障线路零序参数;若二次电弧熄灭,选择零模集中参数模型计算故障线路零序参数。依据所选模型建立微分电路方程,将线路两端电压和电流采样值作为已知量,利用最小二乘法计算线路参数。采用ATP-EMTP软件的仿真结果表明,所提方法能够得到非故障线路和故障线路的正序参数和零序参数,且选择合适的模型可以提高参数计算精度,其中正序电阻、电感、电容的误差分别小于1%、0.5%、0.23%,零序电阻、电感、电容的误差分别小于0.12%、0.1%、0.04%。

Aiming at the UHV transmission line with single-phase reclosing,a time-domain line parameters calculation method using fault recording data of non-full phase operation during reclosing is proposed.For the non-faulty lines,the positive sequence and zero-sequence parameters are calculated respectively by the equivalent model of linear mode and zero-mode central parameters.With regard to the faulty lines,the positive sequence parameters are calculated using the non-faulty phase-to-phase linear-mode parameter equivalence model.If the secondary arc is not extinguished,the faulty line zero-sequence parameters are calculated using the three-phase coupled line model.If the secondary arc is extinguished,the zero-sequence centralized parameter model is used to calculate the faulty line zero-sequence parameters.The selected calculation model is adopted to establish differential circuit equations,the voltage and current samples at both ends of the line are set as known parameters,and the least squares method is used to calculate the line parameters.Simulation results of ATP-EMTP show that the proposed method can obtain the positive sequence parameters and zero-sequence parameters of non-faulty lines and faulty lines,and a suitable model can improve the accuracy of parameter calculation.Among them,the errors of positive sequence resistance,inductance and capacitance are less than 1%,0.5%and 0.23%respectively,and the errors of zero-sequence resistance,inductance and capacitance are less than 0.12%,0.1%and 0.04%respectively.