PERFORMANCE ANALYSIS OF VERTICAL AXIS WIND TURBINE WITH OPTIMISED PITCH ANGLE VARIATION
Keywords:
Pitch, wind turbine, multiple steam tube, blade element momentumAbstract
Wind power generation systems are rapidly growing energy sector due to awareness of green power generation. Vertical axis wind turbine system has potential to improve further for enhance efficiency of energy extraction. Vertical axis wind turbines have several advantages over horizontal axis wind turbine like insensitive of wind direction, easy installation and maintenance, low tip speed ratio etc. Low tip speed ratio cause of high angle of attack, low parasitic drug and less aerodynamics noise production. The main challenges of the vertical axis wind turbine are continuously varying angle of attack, which leads to unsatisfactory self-starting and poor power generation, and ripple in power generation. The problems can be reduced by implementing pitch control with optimized pitch variation due to the variation of azimuth angle and tip speed ratio. In the present study modified, double multiple stem tube (DMST) model has been utilized for obtain the aerodynamic thrust and power output from turbine. The modified DMST model has been obtained by the combination of DMST and BEM model, which can provide better approximation with the consideration of tip loss factor. Optimized pitch variation has been considered to obtain higher power with less power ripple. Matlab Simulink has been used for simulation study of vertical axis wind turbine performance. Comparison of the fixed pitch (FPVAWT) and variable pitch (VPVAWT) system for power extraction has been done with different tip speed ratio.
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