Load Flow Analysis With Newton-Raphson and Gauss-Seidel Methods in a Hybrid AC/DC System

In this study, a dc system was added to the IEEE 33-bus radial distribution system (RDS) test system using voltage-source converters (VSCs), and a hybrid ac/dc system was designed. For this designed system, a load flow analysis was made under the MATLAB platform. The Gauss-Seidel and Newton-Raphson methods, which are widely used in load flow analysis, are used. Comparisons of these methods were made according to the number of iterations, total line losses, and active and reactive powers generated and consumed in terms of different tolerance values. In the results obtained from the load flow analysis studies, the powers produced by the generator are calculated as close to each other according to the load demands for both methods. However, it was seen that the least iteration number and the least power loss were obtained by the Newton-Raphson method. According to the results obtained as a result of applying the power flow algorithm used in the hybrid ac/dc system, it has been proven that this algorithm is successfully applied to the solution of a power system problem. In addition, the results show that the designed system is accurate and reliable.