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Method for estimating parameters of incompletely commutated three-phase power transmission line based on PMU measurement

A power transmission line and three-phase power technology, which is applied in the field of parameter estimation of incompletely commutated three-phase power transmission lines based on PMU measurement, can solve the problem of insufficient accuracy of three-phase power transmission line parameter estimation that cannot meet requirements, cannot be calibrated, and is complicated advanced questions

Inactive Publication Date: 2019-02-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

So far, only a few researchers have been involved in the more complex three-phase power transmission line parameter identification research, but the proposed method is only for transmission line identification and cannot be calibrated; or the estimation accuracy of complex three-phase power transmission line parameters is not high , does not meet the requirements

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  • Method for estimating parameters of incompletely commutated three-phase power transmission line based on PMU measurement
  • Method for estimating parameters of incompletely commutated three-phase power transmission line based on PMU measurement
  • Method for estimating parameters of incompletely commutated three-phase power transmission line based on PMU measurement

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Embodiment Construction

[0051] Related technologies adopted in the present invention include:

[0052] The previous transmission line models were all based on the symmetry of the three-phase transmission line. Only the three parameters of series resistance, series reactance and parallel susceptance were considered, which could not completely equate the actual situation of the power transmission line. In order to more accurately equate the three-phase power The actual situation of the transmission line, so the present invention not only considers the impedance parameter, but also considers the admittance parameter, therefore forms a total of 24 parameters of self-impedance, mutual impedance, self-admittance and mutual admittance, and the present invention defines this model as incomplete commutation Three-phase power transmission line model. The non-completely commutated three-phase power transmission line model can meet the actual needs of various power network analysis.

[0053] 1. Impedance matrix...

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Abstract

The invention discloses a method for estimating the parameters of an incompletely commutated three-phase power transmission line based on PMU measurement, including the estimation of 12 admittance parameters and the estimation of 12 impedance parameters. The beneficial effects are as follows: the method for estimating the parameters of an incompletely commutated three-phase power transmission linebased on PMU measurement overcomes the shortcomings of the previous parameter estimation methods; the estimation errors of self-impedance and self-admittance parameters are less than 1%, and the estimation errors of mutual-impedance and mutual-admittance parameters are less than 2%; and more accurate power transmission line parameters can be provided for an energy management system, so that the error parameters of an incompletely commutated three-phase power transmission line can be identified accurately and calibrated in time and online.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a method for estimating parameters of incompletely commutated three-phase power transmission lines based on PMU measurement. Background technique [0002] With the continuous grid integration of renewable distributed energy and the application of a large number of power electronic devices in the grid, the online operation monitoring of the power system has become more and more challenging. Although the integration of new energy into the grid can alleviate the problem of energy shortage, it also increases the nodes of generators, thereby increasing the dimension of the power grid, resulting in greater uncertainty in the topology of the power grid and transmission line parameters. The power transmission line is the main structure of power transmission in the whole power network, the accuracy of its parameters directly affects the results of power system s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02G01R27/08
Inventor 张葛祥魏登皎荣海娜赵俊博
Owner SOUTHWEST JIAOTONG UNIV
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