| With the expanding of the scale of the power system, the ultra-voltageand long distance transmission lines have a wide range of applications, dueto cost and technology, the ultra-voltage and long distance transmissionlines employ un-transposed operation, which makes the parameters of thepower system no longer symmetry. For asymmetrical parameters oftransmission lines, if we adopt the traditional analysis method such assymmetry component, we can’t realize the decoupling among the sequencecomponent, if we adopt the phase component, the amount of calculation istoo large and the efficiency is not high, if we adopt the equal transmissionconstant of mode component method, we can not only solve theasymmetrical transmission line, but also have small amount calculationcompared with phase component method.The core of the equal transmission constant of mode componentmethod is to solve a matrix which makes the product matrix diagonalization,namely the phase-mode transformation matrix. Clarke matrix is a standardtransformation matrix for symmetry parameter transmission lines, thephase-mode of the asymmetrical parameter transmission lines should have arelation to the Clarke matrix. To solve the phase-mode transformationmatrix of the asymmetrical transmission lines, this paper firstly makesimilarity transformation by the Clarke matrix for the product matrix, thenwe make the similarity transformation matrix diagonalization, whichobtains the corrected matrix. Finally we multiply the Clarke matrix by thecorrected matrix to obtain the phase-mode transformation matrix which issuitable for the asymmetrical transmission lines. Afterwards, we adopt theequal transmission constant of mode component method to make faultanalysis and fault location. Compared to the simulation results and thecalculation results, the accuracy and the feasibility of the proposed methodwhich deals with the fault analysis of the asymmetrical transmission linesare verified. |
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