Performance analysis of vertical axis wind turbine with variable swept area

Abstract

This paper presents optimum power output from vertical axis wind turbine (VAWT's) by changing variable swept area. We used the H-Darrieus type of VAWT's, it has developed extendable blade and radius of VAWT's. These turbines response to the wind speed by changing swept area automatically extend outward at low wind speed and retract at excessive wind speed. This action increases the efficiency and get higher power capture at low wind speed. These innovative design found that the power production increased 260% over the turbines through variable swept area.