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This paper models the energy systems of Great Britain (GB) and Greece in EnergyPLAN for the year 2020. EnergyPLAN is an analysis tool that simulates energy systems on a national scale. Future alternative scenarios were developed considering smart charging of Electric Vehicles (EVs). The model was run with a range of Renewable Energy Sources (RES) integration and with three different scenarios for...
A future perspective micro-grid with a medium-term prediction for 2030 is described. The present state of intentional islanding is briefly reviewed. Distributed Generators (DGs) and Electric Vehicles (EVs) to sustain the local distribution system in the event of interruption of supply are considered. Projections regarding their availability are presented and different penetration scenarios are addressed...
Technical challenges concerning microgrids are identified. Differentiation between grid-connected and islanded mode is made, while literature based solutions are presented. The concept of Virtual Grid is introduced and a microgrid model is used as part of a generic Low Voltage Distribution Network. PSCAD/EMTDC and IPSA+ models of the microgrid are utilised for the study of the steady state voltage...
A MicroGrid is expected to operate both as a sub system connected to the main grid or as an islanded system. However the provision of fault currents, in an islanded MicroGrid consisting only of micro-generation interfaced with relatively low-current power electronics, is a serious system protection issue. This paper presents the novel concept of using the central energy storage system (flywheel) as...
The demand for electricity continues to grow globally and the fonnation of MicroGrids is becoming a potentially attractive option to meet the expanding energy demands. A MicroGrid consists of a cluster of micro sources, energy storage systems (e.g. flywheel) and loads, operating as a single controllable system. A MicroGrid can be operated both connected to the main grid or as an island and must maintain...
Under normal operating conditions, a microgrid (MG) is interconnected with the medium voltage (MV) network. However, planned or unplanned events like maintenance or faults in the MV network, respectively, may lead to MG islanding. In order to deal with islanded operation and even black start following a general blackout, an emergency operation mode must be envisaged. Two possible control strategies...
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