MAXIMISATION OF R.E.S. PENETRATION IN GREEK INSULAR ISOLATED POWER SYSTEMS WITH THE INTRODUCTION OF PUMPED STORAGE SYSTEMS

摘要

In the present paper, the maximisation of the Renewable Energy Sources (R.E.S.) penetration in non-interconnected Greek insular systems with the introduction of pumped storage systems is investigated. The proposed power systems are introduced in the examined islands with the following goals: the maximisation of the available renewable energy sources exploitation the minimisation of the electricity production cost the improvement of the security of the electrical systems. The achievement of the abovementioned targets is investigated through the case studies implementation in characteristic isolated insular power systems of small (Kasos - Karpathos, Astypalaia), medium (Rhodes, Lesvos) and large size (Crete). In the examined cases, the fundamental power source is the wind power. The pumped storage systems aim at the wind power stochastic production adaptation to the power demand. The possible available potential of any other renewable energy sources (biomass, geothermy) in the examined insular system, may contribute to further limitation of the conventional thermal generators power production. The proposed systems are dimensioned and the corresponding investments are evaluated. Finally, the dynamic security of the existing and the proposed electrical systems is evaluated with the simulation of the corresponding systems operation. The conclusions of the present paper are: The R.E.S. penetration percentage in the Greek insular systems may exceed 80% of the annual energy demand. The electricity production cost is minimized, even in the isolated systems of small size. The corresponding investments exhibit very good economical indexes, regardless the possible availability of initial capitals subsidy. In case of initial capitals subsidy availability, the investments exhibit quite attractive economical indexes. The dynamic security of the proposed systems is improved considerably, due to the existence of hydro turbines in the power production systems. The necessity for spinning reserve from the thermal generators is restricted.