Dynamic Modeling and Simulation of a Counter-Rotating Wind System with 1-DOF Planetary Speed Increaser

The paper presents a theoretical study on the dynamic behavior of a wind system composed by two counter-rotating wind rotors-planetary speed increaser-conventional generator. Its dynamic analytical model is developed by using the Newton–Euler method, in the assumption of rigid bodies and known linear mechanical characteristics of the two wind rotors and of the direct current generator. Numerical simulations were carried out in MATLAB-Simulink on a 700 kW wind turbine case study, which allowed highlighting the time variation of the kinematic parameters, torques and powers for the system shafts, both in transient and steady-state regimes. Analytical and numerical results are useful to researchers, designers and developers of wind turbines, who aim to optimize their construction and functionality through virtual prototyping.