Robust power transmission line positive sequence parameter identification method

Abstract

The invention discloses a robust power transmission line positive sequence parameter identification method. The robust power transmission line positive sequence parameter identification method comprises steps that phasor measuring devices disposed on two ends of a single circuit power transmission line are used to measure the three-phase current and the voltage phasor of the two ends of the line; the calculation equation of the line impedance parameter and the admittance parameter is established according to a single circuit power transmission line three-phase equivalent model and by combining with the three-phase current and the voltage phasor of the two ends of the line; a Huber estimation target function having a robust capability is constructed to be used as the target function identified by the line impedance parameter and the admittance parameter, and therefore a line impedance matrix and an admittance matrix parameter are acquired; by adopting a method of symmetrical components, the line impedance matrix and the admittance matrix are decoupled to acquire positive sequence impedance and a positive sequence admittance parameter. The robust power transmission line positive sequence parameter identification method is advantageous in that operability is strong, and implementation is easy; the precision of the positive sequence impedance parameter acquired by identification is high; the good robust capability is provided, and identification results are more credible.

Description

technical field [0001] The invention relates to the technical field of power system operation control, in particular to a method for identifying positive sequence parameters of a robust transmission line. Background technique [0002] With the continuous development of the power system, there are more and more transmission lines, and the system becomes more and more complex. Therefore, our requirements for the accuracy of the parameters of the transmission lines are relatively high. Accurate line parameters are the basis for power flow calculation, fault analysis, relay protection setting, network loss calculation and other power system calculations. When the line parameters are inaccurate, it will greatly affect the accuracy of the calculation of short-circuit current, stability calculation and power flow calculation. Therefore, the accuracy of transmission line parameters also affects the safe, stable and reliable operation of the power system. [0003] Transmission line...

AI Technical Summary

Problems solved by technology

This method has problems such as the need to cut off the power of the line under test, and the parallel lines running multiple times cannot measure the mutual inductance.

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