Relay coordination is reliable and crucial to guarantee that healthy feeders are properly isolated from the defective areas in a microgrid network. An appropriate protection scheme must be properly planned during the design of the microgrid to ensure safety for the power components in the event of a failure. The implementation of distributed generators in the microgrid changes the total network’s Load-Flow and often impacts the magnitude and direction of the fault current. Using the nature-inspired novel evaporation-rate-based water cycle algorithm (ERWCA), the enhancement in microgrid protection is accomplished in this work by optimizing the relay settings, reducing their operation time and time dial setting of each relay. The approach proposed is validated with the IEC microgrid benchmark system and the findings are contrasted with current techniques. It is found that the proposed strategy produces substantial improvement for the microgrid in the application of over-current relays and greatly reduces the relays’ overall net operating time.

中继协调是可靠且至关重要的，以确保将健康的馈线与微电网中的缺陷区域正确隔离。在微电网的设计过程中，必须适当计划适当的保护方案，以确保发生故障时功率组件的安全。在微电网中实施分布式发电机会改变整个网络的负载流，并经常影响故障电流的大小和方向。使用自然启发式的新颖的基于蒸发速率的水循环算法（ERWCA），通过优化继电器设置，减少其操作时间和每个继电器的时间刻度设置，可以增强微电网保护。所提出的方法已通过IEC微电网基准系统进行了验证，并且与现有技术进行了对比。发现所提出的策略在过电流继电器的应用中为微电网带来了实质性的改进，并大大减少了继电器的整体净工作时间。