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Transmission line parameter estimation method based on fractional line models

A technology of parameter estimation and circuit model, applied in the direction of electrical digital data processing, calculation, special data processing applications, etc., can solve the problem that the data cannot meet the needs of the staff's prediction and mastering, and achieve good promotion and application value and prospects

Inactive Publication Date: 2014-02-26
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

Because the data provided by the manufacturer during the initial design of the circuit is far from meeting the needs of the staff to predict and grasp the actual operating conditions, so in the electrical calculation of the power system, the equivalent circuit is usually used to describe the characteristics of the system components. Modeling method realizes relative calculation

Method used

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  • Transmission line parameter estimation method based on fractional line models
  • Transmission line parameter estimation method based on fractional line models
  • Transmission line parameter estimation method based on fractional line models

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the present invention will be further described:

[0040] This transmission line parameter estimation method based on the fractional line model,

[0041] 1. Establish the transmission line differential equation. According to the transmission line differential equation obtained from the basic circuit principle, consider the boundary value problem of the lossy RLC transmission line voltage and current.

[0042] Based on the circuit diagram of a uniform transmission line, write the partial differential equation of the transmission line according to the basic principle of the circuit:

[0043]

[0044]

[0045] Time domain-frequency domain Laplace transform is performed on the differential equation of the transmission line, and the differential equation is sorted out by combining the voltage and current boundary value conditions of the lossy RLC transmission line.

[0046] When the line is semi-infinitely lo...

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Abstract

The invention relates to a transmission line parameter estimation method based on fractional line models. The method includes 1, establishing a transmission line equation; 2, modeling a line on the basis of fractional calculus; 3, estimating parameters on the basis of a fractional model, namely estimating through nonlinear regression analysis, selecting a value adjacent to parameter true values as an initial value, allowing the range of the initial value of parameters to be estimated to be adjacent to the true values of 1*10-3 to 1*10-1, and utilizing equation errors to serve as converging conditions to perform iterative parameter estimation; about a terminal connected to optional load lines, adopting the method of simulating data, and adding noise signals with the noise ratio that SNR=8, 30dB, 10dB in ideal data. By the aid of the method, defects that the line model is limited by length are overcome, more reliable line model equations are provided for calculation relevant to line parameters in a power system, and the method has fine promotion and application value and prospect.

Description

[0001] 1. Technical field: [0002] The invention relates to a state estimation method in a power system, in particular to a transmission line parameter estimation method based on a fractional line model. 2. Background technology: [0003] In the power system, the transmission line is equivalent to a means of transportation. It transports electric energy from one area to another. As a carrier of electric energy transmission, it is one of the main components of the power system and plays a vital role in the power system. . The main problem involved in the transmission line is to calculate the parameters of the line, and at the same time, it is necessary to solve the problem of the line model. Because the data provided by the manufacturer at the initial design of the circuit is far from meeting the needs of the staff to predict and grasp the actual operating conditions, so in the electrical calculation of the power system, the equivalent circuit is usually used to describe th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 闫丽梅徐建军闫智峰许爱华刘超祝玉松
Owner NORTHEAST GASOLINEEUM UNIV
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