电力系统等值阻抗的在线估计法

变电站母线处的系统戴维南等值电路是电力系统规划与运行的重要参数。提出一种利用各变电站母线的稳态电压电流测量值,在线估计正序和零序戴维南等值电路阻抗的新方法。此方法可应用于各种负荷工况,不向系统注入扰动信号,且该方法不需要同步采样数据,因此不受系统频率变化的影响。仿真分析和现场测量数据表明此方法可准确实现系统阻抗参数的在线估计。

Online measurement of power system equivalent impedance

The Thevenin equivalent circuit observed at a substation bus is an important parameter for power system planning and operation.An algorithm for online estimation of the positive and the zero sequence Thevenin impedances by using the steady state measurements taken at the substation bus.The proposed method is applicable for various load conditions.The method does not need to impose any disturbance to the system,and does not require synchronized measurements,therefore,does not affected by the variation of system frequency.Simulation and data measurement in the field show the accuracy of the method.