Island grids

Remote islands have nowadays for most of the time a year the potential to use economically reasonable renewable energy sources. The environmental conditions are often favorable. However to ensure grid stability it is still practice to rely on conventional power generation units with synchronous generators, even the price for fuel is steadily rising. For that reason a Power/Energy Management System has to be developed, which guarantees a stable and economically optimal grid operation with the highest possible share of renewables (e.g. from wind or solar). Here different concepts of reference values (power values/voltage phasors) for distributed energy resources will be evaluated. Particularly the latter approach appears with regard to the above-mentioned problem promising. Last, the being developed, hierarchical control system has to be usable for systems with distributed power generation units of different manufacturers so that transferability of the results is achieved.