Objetivo To demonstrate the performance and reliability of a stand-alone pv plant supplying electricity to a village and small, decentralized pv generators supplying electricity to 12 individual houses on the Greek Island of Antikythira. The central pv plant is rated at 25 kWp, and each of the 12 houses has a pv generator of 700 Wp.Average annual production is about 12000 kWh (demand controlled).The main problems encountered were:- with the batteries (precipitation, low capacity, charge regulator, deep discharging)- with the modules (oxidation - short circuit, eventual destruction and replacement)- with the autonomous units (charge regulator-replaced).The project apart from its social success and acceptance by the public, which is no mean achievement in itself, had its share of technical problems and exceeded its budget.The replacement of the batteries and panels some time in the future will enhance its performance and reliability.A more radical solution to the problem of continuous operation and hence reliability of supply has been sought by PPC and the answer may lie in the use of a hybrid system, that is, using in addition to the pv station, a wind generator and a back up Diesel engine.By optimising the operation of the pv station and the battery storage capacity very high penetration values may be reached and the reliability of supply can be secured.The implementation of this concept is presently under investigation.As the only electricity generation and transmission company in Greece, PPC is promoting an electrification programme for a number of small remote Greek islands which currently have no electricity supply. Electrification is expected to increase the standard of living of the island inhabitants and revitalize local communities.In this project a central pv plant supplies electricity for a small village on the greek island of Antikythira. Twelve houses dispersed over the island are provided with small autonomous pv generators. About 70 inhabitants on the island benefit from the electrification programme. Antikythira island is about 75 km south of the Peloponese. The array at the central pv plant consists of 25 kWp of AEG polycrystalline silicon modules, mounted on fixed structures and oriented to the south at an optimized angle of 45 degrees. The array is divided into 8 groups of modules, each of which can be switched by an electronic control system. The control system decides how many groups of modules should be connected to the dc busbar at any one time in order to reach an optimal battery charging rate and to protect the battery against overcharging and deep discharging. The battery has a capacity of 1092 Ah at 216V and feeds a 30 kVA self commutated AEG inverter with a 50 Hz, 220V/380V output. The output of the pv plant is well matched to the load, which is higher during the summer than during the winter.Each of the 12 houses has a 700 Wp array of AEG modules and a 300 Ah, 24V battery. These small pv plants are controlled using shunt regulators and produce a 24V dc supply.The total energy output of the central plant and 12 small systems was expected to be about 35,000 kWh/year. The pv plant was monitored in accordance with the Joint Research Centre guidelines for two years.Monitoring data are available at Ispra for the periods from May 1988 to December 1988 and from February 1990 to December 1990.A technical mission has been made by the JRC in June/July 1988 to assist with the monitoring of this project. Programa(s) ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985 Tema(s) 6.1 - PHOTOVOLTAIC Convocatoria de propuestas Data not available Régimen de financiación DEM - Demonstration contracts Coordinador PUBLIC POWER CORPORATION (PPC) Aportación de la UE Sin datos Dirección HEP DEV. DEPT 56-58 AGISIALOU STR. 10436 Athens Grecia Ver en el mapa Coste total Sin datos
