Microgrid (MG) plays a crucial role in developing the modern smart grid. A microgrid can be integrated with renewable energy sources as a practical way to guarantee consumers' supply security. Designing an appropriate protection mechanism is one of the key technical challenges in implementing a MG. The technique must operate in grid-following and grid-isolated modes while still achieving the fundamental protection needs of selectivity, reliability, and sensitivity. Traditional protection solutions are inappropriate for MG due to bidirectional current flow, small fault currents in the inverter interface MG, and variations in their operation methods. Due to the change in the operation method of the MG, the magnitude and direction of the fault current are also reversed, for which conventional overcurrent protection systems perform poorly. For the MG to operate reliably, the fault must be identified and fixed as soon as possible as it appears. This paper suggests a fault detection approach for AC MG using the Transient Monitoring Function Index (TMFI) in a grid-connected mode that detects the fault efficiently. To assess the effectiveness of the recommended methodology, a test IEEE seven-bus MG system is modeled in the Real-Time Digital Simulation (RTDS) framework, and the suggested strategy is evaluated. The interpretation was interpreted in the MATLAB environment. The simulation results confirm the accuracy of the suggested technique.
Advanced Fault Detection Technique for AC Microgrid Protection
2023-08-09
638443 byte
Conference paper
Electronic Resource
English
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