输电线路参数辨识的影响因素研究

Research on Factors Influencing Identification of Transmission Line Parameters

输电线路参数是电力系统各项仿真计算的基础,为此文章立足实测数据挖掘电网真实参数,研究了辨识模型、并联高抗、量测误差3个方面对线路参数辨识结果的影响。辨识模型表明,分布参数与集中参数辨识模型均可以采用型等值模型进行计算,通过灵敏度分析线路长度对单位长度线路参数的影响。研究了高抗补偿位置、补偿度分别对辨识电阻、电抗和电容的影响程度。量测误差小扰动分析揭示了电压幅值、相角以及电流幅值、相角对参数辨识结果的影响机理,并通过仿真算例证实了高抗对辨识电容影响以及量测误差对辨识结果的影响程度。

Parameters of transmission lines are the basis of computations and simulations of power system.Based on the synchronized phasor measurement-based data mining,the impacts of identification model,shunt reactor and measurement error on line parameter identification are analyzed.Analysis on identification model shows that the-shaped equivalent model can be applied to the computation of distributed parameter identification model and lumped parameter identification model,and the influence of line length on unit length line parameters can be determined by sensitivity analysis.The respective incidences of shunt reactor position and compensation degree on the identification of resistance,reactance and capacitance are researched.Analysis on small perturbation caused by measurement error reveals the impacting mechanism of amplitudes and phase angles of voltage and current on parameter identification results,and the impact of shunt reactor on indentified capacitance and the impact of measurement error on identification results are confirmed by simulation example.