Abstract
A new method for operating a stand-alone photovoltaic/wind/diesel/battery hybrid power system is presented. The system, especially its diesel generator, is controlled so that the battery charge is kept at a specified level. The battery is charged when its present charge level is lower than the specified level and discharged when higher. A simulation is carried out over one year using the hourly data of electric load, insolation, temperature, and wind speed at Kamishima Island, Japan in 1996. This method is compared with other methods: a conventional operating method and a dynamic programming operating method. The results show that in regards to the fuel consumption of diesel generator, the proposed operating method is superior to the conventional method although not than the DP method, and the fuel consumption has a minimum if the PV energy is same as the wind energy.
