Determinación de la fórmula de pérdidas en transmisión para el cálculo de despacho económico usando métodos de flujos de potencia

Abstract

The active power losses existing in transmission mean that the SEP does not guarantee an adequate supply of electrical energy, which consequently also affects the economic dispatch of electricity. For the analysis of these losses to be as close to the ideal value, the loss formula applied to the economic dispatch must be calculated. In relation to this, the loss formula focuses its search on defining loss coefficients also called B coefficients, which can be solved by different methods linked to power flows. As a solution strategy to determine the loss formula in this project, the use of three methods to calculate the coefficients B. The algorithms expressed in the document will be carried out in the Matlab programming language, analyzed in IEEE 9, 14 and 39 bus power electrical systems. After calculating the power flow by Newton's method, we proceed to calculate the coefficients B. The first so-called classical method that calculates the coefficients 𝐵𝑖𝑗, 𝐵𝑖0 and 𝐵00 by means of the transformation of currents. The second method called bar admittance (Ybar) as its name says, calculates the B coefficients by modifying the bar admittance of the system, it is worth mentioning that this method only calculates the quadratic matrix 𝐵𝑖𝑗. Finally, the Grainger and Stevenson (G&S) method which also calculates the coefficients 𝐵𝑖𝑗, 𝐵𝑖0 and 𝐵00. Comparison of the results obtained by each method ensures an adequate response as soon as the values of the generators and other technical and operational specifications are not modified. On the other hand, the programs developed in Matlab are applied to the calculation of any power electrical system since all the methods are carried out in a generic way.