Evaluación de la cargabilidad y determinación del equivalente thévenin en sistemas eléctricos de potencia en base al cálculo de la potencia de cortocircuito usando mediciones locales

Abstract

This research proposes the development of a methodology to determine the Thevenin Equivalent (TE) parameters based on Short Circuit Power (SSC) of the TE. This condition improves the application of the maximization criterion for power transferred in an Electric Power System (EPS) based on TE impedance. The proposed scheme considers the determination of the ET from the parametric power space by first obtaining information concerning to the SSC and the loadability of the EPS.

In addition, the present work proposes a new voltage stability indicator, called VPSI (Voltage – Power Stability Indicator), which is calculated by processing consecutive measurements of the voltage and power, both measured at the same point of the EPS. By processing the VPSI it is possible to obtain the SSC.

The development of an algorithm to determine the ET and the loading, based on the SSC, is also presented in this research. The results obtained in test systems present a better performance than the techniques based on the existing methods. Finally, to prove the suitability of the proposed schemes, the algorithms are applied using real-world measurement of the Ecuadorian National Transmission System, at different voltage levels with satisfactory results.