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.

分布式发电 (DG) 与光伏 (PV) 系统一样，由于其来源的可用性和安装的简便性，迅速令全球消费者满意。尽管具有环境优势，但众所周知，连接到电网的新发电源可以改变功率流，例如改变负载电流值。有几篇论文侧重于基于短路电流分析的当前过流保护解决方案。然而，电力系统保护不仅取决于短路电流，还取决于负载电流值。这项工作评估了不同的场景，考虑了通过电力系统的拓扑位置和 DG 数量的不同组合。所选馈线 IEEE-13 节点测试馈线在 Simulink 中建模，处于稳态，考虑到小型光伏分布式发电系统 (PVDG) 的高渗透率。对馈线特定母线电流变化的分析表明，在极端情况下，负载电流值降低了 80% 以上。结果表明，过流保护装置 (OCP) 的变化会随着 DG 的大量插入进行调整，这对于保证装置的灵敏度及其过载的正确性能至关重要。