Design and Implementation of Adaptive Directional Over-current Relay for Smart Micro Grid

Abstract

This report details the design and implementation of an Adaptive Directional Over-Current Relay for smart micro-grids, using LabVIEW software and an Arduino Uno microcontroller. The aim is to enhance micro-grid protection and reliability, allowing operation both independently (islanded mode) or in conjunction with the main power grid (connected grid mode). The relay system features an over-current detection capability to initiate protective actions against excessive current, and a directional feature based on symmetrical components. This directional function ensures the relay responds only to faults or abnormal conditions within a specific zone, improving protection accuracy. A key innovation is the adaptive feature, enabling the relay to adjust its settings dynamically in response to changing power system conditions. This adaptability is essential for micro-grids with variable renewable energy sources like solar panels and wind turbines, ensuring optimal performance in both islanded and connected modes. The report covers the design methodology, implementation, and testing of the relay, highlighting the practical use of LabVIEW for control algorithms and the Arduino Uno for hardware interfacing. Experimental results and simulations validate the system's effectiveness, offering a robust solution for enhancing the safety and efficiency of modern micro-grids.