Optimum Ratio of PV Output Energy in Stand-Alone PV and WG Hybrid System

Abstract

Though photovoltaic power generation (PV) and wind power generation (WG) have advantages that they are clean and infinite energies, they have a disadvantage that electrical output energy is unstable. The disadvantage causes them to need big energy storage device such as a battery and to increase their construction cost. A PV and WG hybrid system may be effective for stabilizing output energy in strong wind sites. However, since the stability may relate to a ratio of PV output energy fluctuation to WG output energy fluctuation, it is very important to clear an optimum ratio. In this paper, the optimum ratio at strong wind sites is described. Moreover, it is cleared that how load profile or quantities of surplus power affect the optimum ratio and capacity of battery.