Improving the energy performance of wind turbines implemented in the built environment using counter-rotating planetary transmissions

7th International Conference on Advanced Concepts in Mechanical Engineering

Saulescu, R.^1 ; Neagoe, M.^1 ; Jaliu, C.^1

Renewable Energy Systems and Recycling Research Centre, Transilvania University of Brasov, Romania^1

关键词: Built environment;    Degree of freedom;    Efficiency models;    Energy performance;    Planetary transmission;    Rotor and stators;    Transmission efficiency;    Turbine applications;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012089/pdf
DOI  :  10.1088/1757-899X/147/1/012089

来源: IOP

【 摘 要 】

Most of wind turbine applications for urban areas use electric generators with counter-rotating rotor and stator, able to ensure a better efficiency than the conventional turbines with one wind rotor and generator with fixed stator, and, hence, a higher production of electricity. These types of power systems have two independent wind rotors that require a complex control of the two independent input speeds to obtain the optimal output speed. This paper deals with the use of a 1DOF (Degree Of Freedom) compound planetary transmission with two inputs and two outputs and three sun gears, meant for the implementation in counterrotating wind turbines, which has the properties of summing the input torques and determined transmission of the independent speed. Firstly, the kinematic and static analysis of the proposed planetary transmission, assuming friction of gears, is performed. Afterwards, the mechanism efficiency model is established depending on the ratio of the two input torques. The transmission efficiency is simulated and analysed, with determination and representation of power flows, in the four distinct operating cases according to the k ratio values. The paper results allowed formulating recommendations on the design of these mechanical planetary transmissions used in wind turbines and broadening a database for the conceptual synthesis of wind systems.