A master thesis from Aalborg University
Using PMU Measurements to Assess Dynamic Line Rating of Transmission Lines
Author(s)
Term
4. term
Education
Publication year
2013
Submitted on
2013-06-04
Pages
112 pages
Abstract
In this report a dynamic line rating(DLR) model is constructed. The overhead line which is subject of this report is the BR1 connection which is positioned in south west Iceland. The model uses measurements from a phasor measurement unit where from the impedance and admittance of a transmission line is computed. The impedance and admittance are acquired assuming the line can be modelled as a ¼-model. A numerical solver is constructed in order to compute the average height of the conductor using the information about the susceptance from the PMU measurements. The curve of a overhead line can be described by the catenary equation which is a hyperbolic function containing information about horizontal tension, weight per meter of the conductor and the span length. The horizontal tension decreases with increased conductor temperature and that relationship is there fore linearised while the weight per meter is kept constant. The span length varies through out the BR1 connection accordingly. The model is tested by implementing data from a fixative example where the result indicate that the equations are implemented correctly. The model is then tested in a case study using data from the BR1 connection. The result from the case study indicate that the model is not working properly. A sensitivity analysis is there fore conducted on the model, proofing that the model is very sensitive to any variation in the current angle. At last the model is tested by implementing the data of the BR1 connection in the simulation program DigSilent Powerfactory. By varying the load and the resistance the value of the susceptance deviates insignificantly. The model is there fore considered to work properly in theory but as the value of the susceptance is very sensitive to any variation in the current angle the model is not considered to be the ideal tool for DLR.
Keywords
DLR ; PMU ; Landsnet ; Susceptance
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