Power Flow Solution Combining Newton-Raphson and Fast Decoupled Methods

In this article the Newton Raphson (NR) power flow solution method is developed from the initial conditions obtained starting with the Fast-Decoupled Load Flow (FDLF) method. It means, an algorithm is proposed that combines both procedures to resolve power flows more efficiently, thus decreasing the number of iterations for processing times approximately equal to those obtained in the NR method. The methodology developed is applicable only for systems where R ≪ X, with a relationship between 1/5 y 1/10, common in systems higher than 200 kV. The proposed combined method (CM) has been validated through 4 case studies and for three different tolerance levels using MATLAB. Then, the compilation time between NR and CM for all evaluated cases between the two PCs shows variations of tenths of a second, practically negligible for the four case studies analyzed in this paper.