Análisis de Equilibrio de Voltaje en un Sistema de Subtransmisión, Mediante Curvas Qv-pv y Análisis Modal

Voltage collapse in an electrical network can occur in various ways: as an increase in load, operation of the maximum performance of the machine, very remote generation points, very high inductive reactive powers, among others, thus generating unbalance in its voltage and in the angles of the nodes in an electrical system. In the Manabi province network, it was identified, by means of the PV curves, that the 69 kV Chone bus is the most critical and, with the QV curves, that the 69 kV Manta bus is the most critical, using DigSilent software. To obtain the participation factors of the branches and generators, it is necessary to increase the load to 0.1 Mvar to estimate the load using the modal analysis, where the most critical substation of the branches is Quevedo, which has 0.8986 p. u. and in its generators the substation is Montecristi, which reaches a value of 0.346 p. u. in its voltages, using Matlab to run the analysis. This study is of great importance, since with these projection values it will be possible to observe the places where voltage instability occurs and optimize the network in different ways, either by increasing the generation, placing capacitor banks, among others, at the point where the collapse is generated.