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Wind and Structures
  Volume 35, Number 2, August 2022 , pages 121-130

Optimization of a four-bar mechanism cyclic pitch control for a vertical axis wind turbine
Mariana Montenegro-Montero, Gustavo Richmond-Navarro and Pedro Casanova-Treto

    In this paper, the issue of pitch control in a vertical axis wind turbine was tackled. Programming the Actuator Cylinder model in MATLAB, a theoretical optimum pitch solution was found and then a classic four-bar mechanism was adapted to that theoretical solution to achieve a simple and elegant control of the pitch in the turbine. A simulation using the mechanism worked to find the optimum pitch cycles, where it was found that the mechanism would, in fact, increase the efficiency of the VAWT, by at least 11% and in the best case, over 35%. Another aspect that is studied is the possibility of selfstart of the turbine by only changing the pitch on the blades. This analysis, however, proved that a further individual pitch control must be used to surpass the cogging torque. All analyses conducted were done for a specific wind turbine that is 2 m2 in the swept area.
Key Words
    AC model; angle of attack; optimum pitch; VAWT; self-start
Mariana Montenegro-Montero:Instituto Tecnológico de Costa Rica, Provincia de Cartago, Cartago, 30101, Costarica

Gustavo Richmond-Navarro:Instituto Tecnológico de Costa Rica, Provincia de Cartago, Cartago, 30101, Costarica

Pedro Casanova-Treto:Unversidad de Costa Rica, Ciudad Universitaria Rodrigo Facio Brenes, San José, San Pedro, Costarica

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