Mechatronic Control Model of a Novel Variable Speed Wind Turbine Concept with Power Splitting Drive Train: A Bond Graph Approach

Abstract

This paper describes a Bond Graph modeling and control of a new wind turbine concept with a power separation drive train. The introduced wind turbine concept is realized by a three-shaft planetary gearbox with double degree of freedom. In this case, the rotor of the wind turbine drives the input shaft, the output shaft is connected to the main generator which is directly connected to the grid without any power electronics, and a servo motor that functions as a control actuator drives the third shaft. The main parts of the wind turbines, such as the rotor aerodynamics, gearbox, generator, and pitch system, are modelled from a mechatronic point of view using the linkage graph approach (BGA). Next, we will discuss the theoretical development related to the control scheme comprising a pitch controller and a planetary gearbox speed controller for the wind turbine with power distribution using a PI controller. The efficiency of the proposed model and controller are verified and simulation results are performed to confirm the validity of the proposed technique. The results are obtained using the 20-sim software (a demo version is available for free on the Internet).