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Operation analysis of Cretan power system considering installation of hybrid stations

Fiorentzis Konstantinos

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Summary

The Cretan power system is the largest autonomous power system in Greece and it consumes about 5% of the total Greek electricity demand. It consists of three conventional power stations combined with a large number of Renewable Energy Sources (RES). Wind and photovoltaic RES technologies traditionally take place in Crete, due to the favorable conditions prevailing on the island, with a significant development in recent years. Their contribution to the total system’s production is considerable, as they reduce the operation of costly conventional units. But their utility in electrical energy storage systems is also remarkable, as they can be the main source for stored energy in such a system.This thesis studies the operation of a hybrid power storage system with pumped hydro storage, which is planned to be installed in the Cretan network. It examines the operation of this hybrid station for different scenarios of load demand and wind production, which is the main source of its "charging", as well as the behavior of the Cretan network after the Hybrid station installation. The simulation has been implemented in PowerWorld simulator software and was divided in two cases. In the first case, the Cretan Power System was simulated, giving important results on its operation. The results showed that this analysis is very close to the actual operation of the system. Subsequently, the hybrid power station was installed in the existing network, with appropriate actions. New results have been obtained compared to those of the initial network operation. Moreover, an additional endorsement was made, partially modifying the latter case, which considers the installation of the hybrid station. Substantially, the unit commitment rule was adjusted, for further reduce in thermal units production.In more detail, the results of the study of the Cretan Power system with its current operation are presented initially, and then the operation of the hybrid station was evaluated, analyzing the new results. This evaluation includes the financial benefits that can be achieved with this project, by limiting the production of conventional units. It also shows the expected increased levels of wind penetration, as well as some important conclusions for transmission lines.The results were particularly satisfactory, offering significant benefits regarding the operation of the network. With the inclusion of the hybrid station, significant financial benefits in Cretan power system operation can be achieved, without affecting the safe operation of the system.

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