Abstract
A parallel planetary gear train design is proposed to construct the wind turbine system that has double inputs and one output. The proposed system is flexible for the application, which may use a combination of two rotors, as used for horizontal axis or vertical axis wind turbines. The proposed transmission mechanism merges the dual time varied input wind powers to a synchronous generator. The effect of the gear train parameters on the dynamic power flow variation is modeled and simulated for the proposed wind turbine system. Results indicate the proposed planetary gear train system is a feasible and efficient design for its application to wind turbine systems. The dynamic torque equilibrium equations between meshed gear pairs are employed to analyze the dynamic power flow. The nonlinear behavior of a synchronous generator is also included in the modeling. The dynamic responses of the dual input transmission mechanism are simulated using the 4th order Runge–Kutta method. The study also investigates the effect of system parameters used in this wind turbine system (i.e., the wind speed, the magnetic flux synchronous generator, and the inertia of flywheels) on variations in electrical power output.
Highlights
Global interest in renewable energies has surged in recent years, and the development of green technologies has encouraged the applications of renewable energies to promote energy feasibility and reduce carbon emissions
In 2007, Bunlung [3] studied the aerodynamic influence of wind speed on the starting torque for wind turbine systems
The results showed that the real outputs were far less than the nominal powers for the commercial wind turbines in the market
Summary
Global interest in renewable energies has surged in recent years, and the development of green technologies has encouraged the applications of renewable energies to promote energy feasibility and reduce carbon emissions. In 2005, Cetin et al [1] investigated the effects of blade number and angle for wind turbine systems and proposed a tip speed ratio (TSR) to optimize wind power efficiency. In 2007, Bunlung [3] studied the aerodynamic influence of wind speed on the starting torque for wind turbine systems The majority of such systems transmit power using planetary gear systems based on the analysis conducted in 1972 by Freudenstein and Yang [4]. A double-set planetary mechanism of gear trains is proposed as a dual input module for a small wind turbine system. The proposed system may use the mixture of rotors as used for HAWTs and VAWTs. The power flow of the dual input mechanism was analyzed, and the system’s starting torque is discussed. The feasibility of a variable inertia flywheel was investigated for the small wind turbine system
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