Abstract
The distributed power generation (DG), like photovoltaic (PV) systems, promptly pleased consumers worldwide due to the availability of the source and the ease of installation. Despite the environmental advantages, it is known that the new generating sources connected to the power grid can provide modifications in the power flow, changing, for example, the load current values. Several papers were focused on present overcurrent protection solutions based on short-circuit current analysis. However, the power system protection depends not only on the short-circuit current, but also on the load current values. This work evaluates distinct scenarios, considering different combinations of topological locations and quantities of DG through the power system. The chosen feeder, IEEE-13 Node Test Feeder, was modelled in Simulink, in steady-state, considering a high penetration of small-scale Photovoltaic Distributed Generation Systems (PVDG). The analysis of current variability in specific buses of the feeder showed a reduction of more than 80% of the load current value for an extreme case. The results indicate that changes in the overcurrent protection devices (OCP) adjusts towards a massive insertion of DG can be fundamental to guarantee the sensitivity of the devices and a correct performance of it for overload.
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