PROTECTION SYSTEM ANALYSIS IN LV GRID, WITH HIGH DG PENETRATION, IN PARALLEL AND ISLANDING OPERATION

The ambitious 20-20-20 targets of the European Union
(EU) have been fostering the development of several
projects aiming to help to comply with these goals.
SENSIBLE – Storage-enabled sustainable energy for
buildings and communities is a Horizon 2020 funded
innovation action aiming at integrating small-scale
electro-chemical, electro-mechanical and thermal storage
technologies, together with Distributed Renewable Energy
Sources (DRES), into distribution grid, homes and
buildings.
One of the main objectives of the Portuguese SENSIBLE
demonstrator is to test the islanding operation of a LV with
grid embedded storage devices.
This paper presents the short-circuit studies that were
performed for the distributed resource (DR) island system.
For that purpose the actual secondary substation LV grid
was modeled with MATLAB Simulink software, with real
grid data provided by the DSO and with the grid embedded
storage models provided by the manufacturers. The studies
were performed for all foreseeable configurations
(parallel and island) to ensure clearing of faulted
conditions, and with different load scenarios.