Torque and Power Computation for a Vertical Wind Turbine with Controlled Blade Angles

In this paper, the available torque and power are computed for a vertical wind turbine that has a mechanism of controlling the approaching angle of each blade. The blades are controlled such that they are kept horizontal in the upwind zone and vertical in the downwind zone. Thus, the torque and power are zero in the upwind zone and hence are computed only in the downwind zone. The positive torque and power due to the wind energy and the negative torque and power due to the rotation of the blades are both included in the formulation of the torque and power equations. Based on the results of the torque and power computation, the design of the vertical wind turbine is updated.