Print Email Facebook Twitter Design of a protection scheme for an off-grid microgrid with inverter-based power sources Title Design of a protection scheme for an off-grid microgrid with inverter-based power sources Author Rivera Diez, Laura (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Intelligent Electrical Power Grids) Contributor Popov, M. (mentor) Palensky, P. (graduation committee) Ghaffarian Niasar, M. (graduation committee) Degree granting institution Delft University of Technology Programme Electrical Engineering | Electrical Power Engineering Date 2020-02-14 Abstract The electrical infrastructure is evolving, shifting into a decentralized grid that allows the incorporation of renewable energies and mitigates the negative effects of power outages. It is predicted that this will lead to a substantial increase in the amount of microgrids deployed worldwide. Especially in locationswith a less reliable grid, the microgrids are often in off-grid or islanded operation. If an electrical fault occurs when the microgrid is not connected to the grid and there are only inverter-based power sources, the fault current will not be high enough to be detected by traditional overcurrent protection schemes.This poses a challenge that can be addressed with different strategies. So far, the proposed solutions for protecting microgrids in islanded operation are highly theoretical and have limitations.This research introduces a protection strategy for a small, low voltage off-grid microgrid with only inverter-based power sources. The microgrid has energy storage, solar energy production and generic loads. In this study, a Tesla Powerpack and Inverter are assumed as energy storage devices, since the research is conducted in collaboration with the company Tesla. The microgrid is modelled in the software PowerFactory from DIgSILENT to verify that the current and voltage magnitudes during fault will be detected properly and the protection devices will be triggered. Protection devices available in the market are proposed, and their settings specified taking into account the results of several simulations. A brief economic analysis is also included to provide a general overview of the cost of such a protection system. Subject microgridislandingprotectionTeslalimited fault currentoff-grid To reference this document use: http://resolver.tudelft.nl/uuid:2e24eadb-ce66-423a-ae1a-fe65ec6aa595 Part of collection Student theses Document type master thesis Rights © 2020 Laura Rivera Diez Files PDF MicrogridProtection_Laura ... 561732.pdf 2.21 MB Close viewer /islandora/object/uuid:2e24eadb-ce66-423a-ae1a-fe65ec6aa595/datastream/OBJ/view