Utilização de energia eólica com transmissão hidrostática acoplada ao regulador eletromagnético de frequência

Abstract

This work presents an alternative to harnessing wind energy with an Electromagnetic Frequency Regulator (EFR) coupled to a hydrostatic transmission and associated with a horizontal axis wind turbine, a bidirectional frequency inverter and a secondary energy source, in a hybridized system. The hydrostatic transmission is composed by a fixed displacement axial piston pump and a variable displacement, swash plate, axial piston motor. Feedback linearization has been used to control the motor geometric displacement, and a prediction algorithm for the steady state rotations of the armature and the electromagnetic field has been developed. A 5 kW project has been simulated in Scilab, with combinations of constant or variable load, and constant or variable wind power. The results indicated that the system was able to supply the generator load, adapting to fluctuations in wind speed. The possibility of storing wind energy through the inverter has also been proven. The system can accumulate energy in batteries during the fastest wind regimes, to use it when the turbine power is lower than the load. This demonstrates that the EFR, in conjunction with a hybridized source, allows wind energy systems to operate isolated from the electrical grid, with guaranteed sine output voltage, as well as constant amplitude and frequency.