Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

Abstract

The improvement of wind turbine performance poses a constant challenge to researchers and designers in the field. As a result, the literature presents new concepts of wind turbines (WTs), such as: counter-rotating wind turbines (CRWTs) with two coaxial wind rotors revolving in opposite directions, WTs with higher-efficiency and downsized transmission systems, or WTs with counter-rotating electric generators (CREGs). Currently, there are a few solutions of WTs, both containing counter-rotating components; however, they can only be used in small-scale applications. Aiming to extend the use of WTs with counter-rotating wind rotors (CRWRs) and CREGs to medium- and large-scale applications, this paper introduces and analyzes a higher-performance WT solution, which integrates two counter-rotating wind rotors, a 1 degree of freedom (DOF) planetary speed increaser with four inputs and outputs, and a counter-rotating electric generator. The proposed system yields various technical benefits: it has a compact design, increases the output power (which makes it suitable for medium- and large-scale wind turbines) and allows a more efficient operation of the electric generator. The kinematic and static computing methodology, as well as the analytical models and diagrams developed for various case studies, might prove useful for researchers and designers in the field to establish the most advantageous solution of planetary speed increasers for the CRWTs with CREGs. Moreover, this paper extends the current database of WT speed increasers with an innovative concept of 1 DOF planetary gearbox, which is subject to a patent application.

A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers

“…The planetary speed increaser type is mainly used in high-power conventional wind systems and in counter-rotating turbines, due to their advantages: high amplification ratios, reduced radial sizes and better efficiency [1,3,16,17,[23][24][25][26][27][28][29][30][31][32]. With dual-rotor systems, the speed increaser, operating as a 2-DOF transmission, sums up the rotors' input speeds [26,30], while operating as a 1-DOF planetary transmission, it sums up the rotors' input torques [31][32][33]. Qiu et al proposed in [23] a synthesis of planetary speed increasers mainly for high-power wind turbines, considering both 1-DOF and 2-DOF types.…”

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

“…Aiming to improve the performance of the electric generators for wind turbines, a counter-rotating generator with permanent magnets for built environment applications is proposed and analysed in [34][35][36]; the counter-rotating generator is proved to have a higher efficiency than the conventional one, with a low starting torque, it is compact and scalable.…”

Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine

“…Such a design was presented for example in [9,11,12]. Aiming to extend the use of counter-rotating rotors wind generators to medium-and large-scale applications, the latest paper [13] introduces and analyzes a new high-performance solution. The authors proposed a system that integrates two counter-rotating rotors, planetary speed increaser with one degree of freedom and four inputs and outputs, and an electric generator with counter-rotating windings.…”