Detection and Identification of Error in On-Line Monitoring of Transmission Line

2014 ◽  
Vol 687-691 ◽  
pp. 869-873
Author(s):  
Song Hai Fan ◽  
Shu Hong Yang
Keyword(s):  
Wavelet Analysis ◽  
Transmission Line ◽  
Systematic Approach ◽  
Abrupt Change ◽  
Power Grid ◽  
Positive Sequence ◽  
Test Results ◽  
Detection And Identification ◽  
On Line ◽  
Sequence Parameters

Systematic approach for the transmission line positive sequence parameters, temperature, and sag based on wavelet analysis to detect error is developed in this work. Unbiased (random/Gaussian) error such as, transient meter failures, transient meter malfunction, and measurements captured during system transients, are inherently in the form of large abrupt change of short duration in a measurement-sequence. These should be detected before the data is used because their presence will lead to insecure and unstable of power grid. The test results of the proposed method based on data of Sichuan power grid are presented.

Parameter Estimation for Series Compensated Transmission Line

2011 ◽  
Vol 12 (3) ◽  
Author(s):  
Yan Du ◽  
Yuan Liao
Keyword(s):  
Transmission Line ◽  
System Analysis ◽  
Measurement Data ◽  
Positive Sequence ◽  
Estimation Accuracy ◽  
Power System Analysis ◽  
Optimal Estimator ◽  
Compensation Device ◽  
Operation Status ◽  
Sequence Parameters

Transmission line parameters are essential inputs to various power system analysis programs and applications such as protective relaying algorithms, and precision of line parameters is thus significant in ensuring the analysis accuracy and algorithm reliability. This paper proposes methods for estimating positive sequence parameters of a series compensated transmission line. The methods are based on distributed parameter line model and utilize voltages and currents from both terminals of the line during normal operations. In particular, based on nonlinear estimation theory, an optimal estimator is designed for deriving positive sequence line parameters. The algorithm is capable of detecting and identifying bad measurement data, and thus improving the estimation accuracy. The proposed method is independent of the operation status of the compensation device.

Algorithm Research on Tower Grounding Resistance On-Line Measurement

2012 ◽  
Vol 239-240 ◽  
pp. 372-375
Author(s):  
Tao Wang ◽  
Bing Li ◽  
Hong Xing Yang
Keyword(s):  
Data Processing ◽  
Transmission Line ◽  
Matlab Simulation ◽  
Grounding Resistance ◽  
Line Measurement ◽  
On Line ◽  
Good Conductor

Traditional transmission line tower grounding resistance measurements have many shortcomings, in order to make up the defects the model of transmission line tower with good conductor wires and multiple grounding leads was builded, and then the algorithm of tower grounding resistance on-line measurement was proposed. On this condition, a system based on this algorithm was designed and further analysis of the error during data processing was conducted. At last, the MATLAB simulation indicates that the algorithm has a accuracy that meets the practical requirements.

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