Abstract
Accuracies of high voltage AC overhead transmission line parameters are important for power system analysis and calculation. In order to obtain accurate transmission line parameters, field measurements of transmission line parameters are often conducted in practice. However, for a large power system, there are many transmission lines that needed to be measured. To determine the priority and significance of transmission line parameters to be measured and reduce the measurement cost accordingly, a selection method is proposed based on the parameter error influences on power system calculation including power flow and static voltage stability. In this paper, the line parameter error sensitivity on power flow is analyzed by the definition of derivation and local linearization, to investigate the positive sequence parameter influences. Then, the L-index is adopted to study the line parameter error impacts on system voltage stability. Based on the two indexes above, a selection method for transmission line parameters to be measured is proposed. The method synthesis the influences of parameter error and obtains the priority of transmission line measurements. Simulation case studies conducted on the IEEE 39 node system have verified the effectiveness of the proposed method for practical engineering applications.
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