Robust power transmission line positive sequence parameter identification method

A transmission line and identification method technology, which is applied in the field of positive sequence parameter identification of anti-differential transmission lines, can solve the problems of power outage of the tested line and the inability to measure the mutual inductance of parallel lines

Inactive Publication Date: 2017-11-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +5
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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.

Method used

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  • Robust power transmission line positive sequence parameter identification method
  • Robust power transmission line positive sequence parameter identification method
  • Robust power transmission line positive sequence parameter identification method

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Embodiment Construction

[0067] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] An embodiment of the present invention provides a method for identifying positive sequence parameters of a robust transmission line, which belongs to an online identification method. The online identification method can synchronously collect the data at both ends, such as voltage, current, phase angle, etc., without powering off the measurement line, so as to realize the identification of online line parameters, and its accuracy and efficiency ar...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/16
Inventor 薛安成徐劲松苏大威张琦兵卢敏游宏宇徐立中冯树海徐飞阳刘俊王治华沈豪栋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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