Simulação de redes de distribuição de energia elétrica monofásicas e trifásicas.

Abstract

The principal objective of this Thesis is to demonstrate that for the planning or operation o f single-phase and three-phase distribution systems simulation is possible use load flow based on the classical moment method and on the modified decoupled load flow with equivalent power accumulation, using single personal computers. Initially, are presented the load flow algorithm based on the Gauss-Seidel, Newton-Raphson and fast decoupled method. The emphasis of this presentation is on the equations dedution, presentation of the flow-chart algorithm and computational aspects. The development of the single-phase load flow based in the classical moment method is start with the presentation of the basic algorithm, where the equations are write in the polar form. Initially are made simplification and is proposed a model for the computational simulation. The equations mathematical formulation include the losses active and reactive, the calculation of the voltages angles, the load tap changing equipament, the voltage angle difference and the current calculation usig the self bus voltage. Numerical results were confront with the results of the Gauss-Seidel, Newton-Raphson, fast decoupled load flow method and original moment method. The development of the version of the three-phase load flow based in the same method follow identical derivation. The neutral voltage is added in the mathematical single-phase load flow equations for three-phase voltages modulo and angle calculation. The results of distribution systems are presented accusing the good evolution for proposed three-phase load flow. The study o f performing distribution systems simulation three versions of the fast decoupled method and o f the self fast decoupled method can to diverge from. The study was centralized in the aspects of bus systems with rise load; radial topology effect and physical paremeter R and X and rise effect o f the larger relation R / X. The development of modified decoupled load flow with equivalent power accumulation is initiate with roundoff error. The algorithm advanced is describe and justified. The numerical results with double and single precision of six balanced distribution systems were confront with results of the decoupled load flow versions of the fast decoupled method and the self fast decoupled load flow, certifing the excellent performing o f the proposed method. The three-phase version of the previous method is initiated with the modelling of power distribution plant. The effect of ground currents and earth wires are included of rigourous manner. The inclusion o f the mutual coupling, o f approximated manner, permited the rise voltage phenomenon study. Finally, for demonstrate the three phase algorithm of the modified decoupled method with equivalent power accumulation, results of the thirteen busbar IEEE radial system are presented, verifmg the good performing of the proposed method.