Wind tunnel experiments were performed to evaluate the power coefficients of three vertical axis wind turbines (VAWTs), namely, (a) conventional VAWT (two‐bladed troposkien shape), (b) novel 50% shifted troposkien shape‐vertical axis wind turbine (50% STS‐VAWT), and (c) novel 100% STS‐VAWT. This comparative performance study shows that VAWTs are not only characterized by superior performance but also exhibit a very simple design that is cost effective from both manufacturing and maintenance perspectives. Two types of three-bladed VAWTs have been designed, one with the Darrieus (H-type) and the other with the Troposkien (Φ-type) rotor configuration, in the 2, 4, and 6 MW rated capacity range based on an optimal parametric study. In this study, aerodynamic performance and feasibility of multi-megawatt vertical axis wind turbines (VAWTs) is compared to existing, similarly rated horizontal axis wind turbines. For offshore wind - still at early stages of the deployment journey - much remains to be accomplished to develop and integrate large-scale systems and to reduce costs. The challenge of integrating greater amounts of variable wind power into the grid is a growing concern that must be addressed. Growing quantities of low-cost wind power still require predictable, supportive regulatory environments and appropriate market designs.
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