Modeling of Ferroresonance Phenomena in MV Networks

In this paper, investigation of ferroresonance phenomena in medium voltage (MV) networks are presented and discussed. The main attention was paid to developing of adequate digital simulation model for investigation of ferroresonance oscillations in MATLAB/Simulink program as well as to analysis of various conditions that may initiate ferroresonance oscillations. In addition, two system grounding arrangements were taken into account with ungrounded and Petersen coil earthed neutral point. In the paper simulative analyses of ferroresonance initiation conditions as well as looking for signals reflecting this phenomenon are described. The phase as well as open delta VT voltages and their spectra were considered as signals for ferroresonance detection. Additionally, the suppression possibility of ferroresonance oscillations was also studied. The results related to both ferroresonance initiation detection and its suppression are presented in the paper.