University of Coimbra has microgrid that ensures power supply in extreme situations
The Institute of Systems and Robotics (ISR) of the Faculty of Sciences and Technology of the University of Coimbra (FCTUC), has developed a resilient electrical microgrid designed for large buildings or energy communities, capable of ensuring power supply to critical loads during extreme or catastrophic situations when the public grid fails.
On 28 April, during the biggest blackout to hit the Iberian Peninsula, this technology, developed at the FCTUC's Department of Electrical and Computer Engineering (DEEC), was put to the test in a real-life situation. It successfully provided power to the building's critical loads and was able to operate independently of the public grid.
"Microgrids are a technology that enables an independent electrical system, separate from the public grid, within a defined geographical area, such as a building, neighbourhood, or small town. They are used to supply electricity in remote areas where infrastructure is weak or non-existent, to optimise energy efficiency, reduce costs, integrate renewable energy and, in extreme cases, ensure the supply of electricity to customers when all else fails," explains Alexandre Matias Correia, a PhD student in electrical engineering at ISR/FCTUC.
This microgrid focuses on resilience and is specifically designed to provide power to critical loads (replacing diesel back-up generators) for extended periods (up to 72 hours). To this end, the microgrid includes a dedicated photovoltaic system, two battery systems, specialist power management and synchronisation equipment, and bi-directional charging for electric vehicles.
According to the FCTUC student, "this system allows the local grid to be supplied with energy stored in electric vehicles, further extending the duration of electricity supply and providing electricity in places where infrastructure is non-existent or damaged." Alexandre Matias Correia further adds, "This microgrid is also capable of regenerating itself, using its photovoltaic panels and load management system to charge batteries during the day, further extending power supply to critical loads."
The resilient microgrid is a project developed as part of Alexandre Matias Correia's doctoral thesis, 'Optimisation and Management of Microgrids to Deliver High Power Quality in Critical and Disaster Situations'. It has already been used as a pilot prototype for other research and teaching projects in Electrical Engineering.