Transmission Line Parameters Estimation using Synchronised Phasor Measurements

• Main Authors: de Moraes, Vinicius Curcio, Lacerda Santos de Sousa, Leticia, de Melo, Igor Delgado, Augusto Duque, Carlos, de Souza, Matheus Alberto, Cesar de Oliveira, Braulio
• Format: Conference Proceeding
• Language: English
• Subjects: faults; Impedance; Impedance measurement; Mathematical models; Optimization; Parameter estimation; Phasor measurement units; power systems; Power transmission lines; Real-time systems; Transmission line measurements; transmission lines; Voltage measurement
• ISSN: 1944-9933
• DOI: 10.1109/PESGM51994.2024.10688603

Transmission lines parameters estimation represents an important issue for power systems operation and planning studies. With the advent of the synchrophasor technology, a large number of new methods has been developed using PMUs (Phasor Measurement Units) based on measurements gathered from sending and receiving ends of a transmission line. This paper presents an optimisation problem formulation in which the least squares equation is used as an objective function to be minimised subject to a set of inequality constraints associated with the impedance parameters of a transmission line, modelled as PI sections in a series configuration including an intermediate high impedance fault model. As a solution of the proposed optimisation problem, the impedance parameters of a given high voltage line can be estimated with reduced errors as well as the distance and impedance of the fault. The main contribution of this work is the representation of an explicit model of transmission lines in an optimisation problem formulated in rectangular coordinates to determine parameters of overhead lines in real time using PMUs. PHIL (Power-Hardware-In-The-Loop) simulations are carried out in order to demonstrate the efficiency of the proposed method.