Percorrer por autor "Saldanha, Emmanuel Lopes da Cruz"
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- Estimation of transmission line parametersPublication . Saldanha, Emmanuel Lopes da Cruz; Ferreira, Angela P.; Pacheco, Fátima; Carraro, Cintia F.F.Transmission line parameters can change over time due to environmental variations and component aging. Traditional calculations of these parameters, based on geometrical data from manufacturers do not account for these dynamics, leading to inaccuracies that impact real-time system operations and long-term applications. This study explores two methods for estimating transmission line parameters. The first approach utilizes Kirchhoff’s law and the characteristic equations of the equivalent π model of transmission lines along with phasor measurements to estimate the line parameters. The second method involves deriving the admittance matrix from sequential voltage and current phasor measurements for a fully observable power system. Two case studies are conducted in this work. One examines a five-bus radial network through the first approach and the other analyzes the IEEE 14-bus test case system through both methods. Series resistance and inductance were estimated with good accuracy by both methods, although the first method had higher accuracy. Shunt admittance was identified using the first approach, but the second approach was not capable of doing so and should be further investigated. Additionally, a sensitivity analysis showed that the number of available measurements impacts the accuracy of the second approach.