Power Flow Analysis on the Dual Input Transmission Mechanism of Small Wind Turbine Systems

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.

Dynamic Analysis of a Single-Rotor Wind Turbine with Counter-Rotating Electric Generator under Variable Wind Speed

“…Different planetary speed increasers for wind and hydro applications are proposed and dynamically analysed in [25,26] as transmissions with one input and one output. A new planetary speed increaser with two inputs and one output is proposed by Lin et al [27] and its dynamic responses are simulated using the fourth order Runge-Kutta method. The time-domain dynamic response of heavy-duty planetary speed increasers is studied in [28] by using the lateral-torsional coupling modelling method; the method is validated on a two megawatt wind turbine gearbox.…”