基于故障录波数据同步技术的输电线路参数辨识方法

Transmission line parameter identification method based on fault recorder data synchronization technology

输电线路多源参数的差异性及其受外部环境影响的易变性使得常规离线测量结果不准确,利用故障录波信息进行在线参数辨识可以满足实际线路参数需及时更新的要求。该方法基于线路双端故障录波信息,考虑双端故障录波信息不同步时间,构建约束方程求解区内外故障时的线路双端数据的不同步时间。在此基础上利用双端同步的电压电流相量,进行线路参数辨识。通过IEEE9节点模型分析验证表明,该对齐方法的对时精度等级约为10-5 s,提高了利用故障录波信息进行输电线路参数辨识的有效性。

The conventional off-line measurement results infected by differences in sources of different parameters and the impact of the external environment are not accurate.The on-line fault parameter identification based on fault recorder information can meet the requirement that the actual line parameters need to be updated in time.Based on the double terminal fault recorder information of the line and considering the asynchronous time of double end fault record information,this paper constructs the constraint equation to solve the asynchronous time data when internal and external faults occur.On the basis of this method,the parameters of the line are identified by using the voltage and current phasor of double terminals.Through the analysis and verification of the IEEE9 node model,it is shown that the time precision of the alignment method is about 10-5 s,which improves the effectiveness of fault line information identification for transmission lines by using fault record information.