Optimizing the size of photovoltaic/wind hybrid generating system controlled by fuzzy inference

The photovoltaic/wind hybrid generating system is analyzed through simulation, and the comparison between the proportional control method (the conventional method) and the fuzzy control method which is proposed in this paper is performed. The results show that the utilization of fuzzy control method, comparing the proportional method, can cut down the energy surplus in nearly half, so that renewable energy can be used effectively. Furthermore, change of the state of charge (SOC) can be controlled, so it becomes favorable for the protection of the storage battery. From these things, thus, it is understood that the capacity of the storage battery can be reduced compared to the conventional method. And this study also shows the method calculates the optimal structure ratio of PV array/wind turbines from electrical load data and weather data.