Abstract
The wind energy conversion system (WEC) has been increasingly proposed to capture wind energy producing electrical power in high efficiency. One of the most important factors that has significant influence on the overall efficiency is the performance of generators in a fixed-speed wind turbine. The efficiency of the generator strongly depends on the operating speed. Therefore, the generator should be controlled to operate at the rated speed to increase the overall efficiency. In this paper, a continuously variable transmission (CVT) was employed to maintain the speed of the generator by controlling the transmission ratio. By employing a position control system based on an electro-hydraulic actuator (EHA), the speed ratio could be tuned continuously to keep the generator at rated speed. Here, an adaptive fuzzy sliding mode control (AFSC) was developed to control the proposed EHA CVT. Mathematical analysis was also carried out to investigate the global stability of the system. Finally, experiments were conducted to evaluate the performance of the proposed WECs.
Highlights
Finding sustainable energy becomes more and more urgent nowadays due to the rapid exhaustion of fossil fuel resources and the unfailingly intensifying of energy demand
By employing a position control system based on an electro-hydraulic actuator (EHA), the speed ratio could be tuned continuously to keep the generator at rated speed
In order to evaluate the effectiveness of the proposed wind energy conversion system (WEC) system, an average wind velocity of 10 m/s was investigated
Summary
Finding sustainable energy becomes more and more urgent nowadays due to the rapid exhaustion of fossil fuel resources and the unfailingly intensifying of energy demand. This control strategy inherits the properties of both PID and sliding mode approaches and provides better tracking performance It is employed in control of hydrostatic transmission system [26], hydraulic servo systems [27]. A similar methodology is used to develop the controller for the proposed EHA CVT in WECs. The control signal includes a PID-like sliding mode control signal ωeq and a fuzzy hitting control signal ωhit to allow both a fast reaching and smooth tracking response. Experimental tests showed that the proposed system was able to drive the generator at a stable speed of 250 rpm and generate a constant power of 10.5 kW at the generator efficiency of 92% These results strongly confirmed the potential of the proposed WECs for practical application
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