Self and Mutual Transmission Line Impedance Estimation by Means of the Non-Linear Least Squares Method

This work presents two methods for estimating the

self and mutual impedance of a tranmission line by means

of the non-linear square method. The first method uses voltage

magnitude, active power and reactive power measurement,

whereas the second method uses synchronized phasor voltage

and current measurements at both ends of the transmission

line. The line impedances values were estimated simultaneously

with the line voltages. No restriction was impose to the values

of the impedances to be estimated. Both methods were tested

in simulated conditions on a 2-bus test system. Parameter

estimations with errors below 1[%] were obtained.