Design criteria and practical experience with hybrid systems using photovoltaic cells and closed cycle vapor turbogenerators

Studies for amelioration of the telecommunication network in and between the islands of the Federal Islamic Republic of Comoros were performed in 1980. The economic comparison of various possible sources of energy included solar and wind, and the photovoltaic generator was chosen as the primary power source for remote stations. The approach for system sizing was based on utilizing a daily simulation procedure, starting from insolation data obtained from many meteorological stations. Simulation tests performed on a hybrid generator provided information which was later proved correct by field results during operation. It is concluded that the use of a fuel-operated generator, such as the CCVT (closed-cycle vapor turbogenerator) with power adapted to partial recharge of batteries, has proved an optimum solution in conditions of insufficient insolation of sites located above sea level