Research on rotating speed control of the vertical axis hydraulic wind turbine

Abstract

In this paper, the vertical axis wind turbine was selected as the research object, with emphasis on the characteristics of the accurate grid-connected motor speed control. First, the mathematic model of the vertical axis wind turbine and hydraulic main drive system was established, the aerodynamic characteristics of the vertical axis wind turbine were analyzed, and the regularity of the periodic fluctuation of the output speed of the vertical axis wind turbine was obtained. According to the wind speed prediction curve and the aerodynamic model of the vertical axis wind turbine, the characteristic curve of the wind turbine speed was obtained. Then according to the grid connection actual demand of the wind turbine, the high-precision grid-connected control strategy of the variable motor swivel and proportional throttle valve based on wind speed prediction was proposed, and the variable motor speed was found to be stable at 1500 ± 2 r/min, realizing the rapid and accurate grid-connected requirements. Finally, the control method was simulated and validated by Matlab/Simulink software, and the control method was validated experimentally on a semi-physical simulation test bench of a 30 kVA hydraulic wind turbine, which achieved a satisfactory control effect.