Analysis of Ferroresonance in Photovoltaic Park Distribution Systems

Ferroresonance is a phenomenon of particular interest, characterized by causing temporary overvoltages in electrical systems, posing a risk to system integrity. Currently the increasing integration of renewable energy sources, such as wind and photovoltaic, generally implement distribution systems with underground cables interconnected trough transformers with different configurations, which increases the possibility of scenarios susceptible to the ferroresonance phenomenon. Since these overvoltage cause deterioration in the power quality and can damage to equipment. In this regard, this paper presents the modeling of photovoltaic park distribution system which connects the photovoltaic system through three winding transformers (Dy1y1) collecting the energy to transmit it through a power transformer connected to the 115 kV system, cable lengths are analyzed to determine the potential occurrence of the ferroresonance phenomenon under phase closing and opening conditions, in addition to evaluating the impact of maximum and minimum photovoltaic generation under system open conditions.