| According to the current development trend of wind turbine to power, high efficiency, high reliability and low cost. Many research institutions and scholars are trying to find different ways to replace the traditional wind power system in the rectifier inverter device, On the one hand, the aim is to ensure the maximum utilization of wind energy, on the other hand, the changeable input speed of the wind turbine is converted to a constant output speed of the system. The research of this paper is based on these points. On the basis of the German company Voith Win Drive for wind turbine gearbox, using a combination of hydraulic machinery, designed for a wind turbine hydraulic machinery stepless constant speed drive.This paper mainly talks about:1. Introduces the background and significance of the article, describes problems in the application of wind energy and present situation of the development of hydro-mechanical transmission device. Proposed this topic, and describes the overall structure of the article.2. According to the principle of two degree of freedom planetary power flow, this paper introduces shunt and bus mode of the common planetary gear and differential planetary gear as well as their speed characteristics and corresponding transmission characteristics. The theoretical analysis of planetary gear characteristics is carried out, the hydraulic power split ratio and efficiency of the input and output are studied in depth.3. Overall design of the hydraulic machinery stepless constant speed drive is carried out and the transmission scheme is determined. Firstly, in order to design the mechanical structure of the system, using the transmission mode which combined the fixed axis planetary gear train with a differential planetary gear train. Analyzing and calculating its specific speed, torque and power characteristics, finally, the optimized structure parameters are given. Secondly, using variable pump-quantitative motor structure in order to design hydraulic speed control part. And its speed regulation characteristics are also analyzed. Finally, choose the fuzzy adaptive PID control strategy, design the corresponding fuzzy controller.4. Established the part of the mechanical structure in ADAMS software and hydraulic governor section simulation models in AMESim software, combined two softwares to obtain the overall system model. Finally, set up the wind speed input module model and observe in the AMESim.5. Co-simulated to the system, observe the speed curves, efficiency curves, etc., through the analysis of simulation results, we gain the result that the designed hydraulic machinery stepless constant speed drive can ensure system output at a constant speed 1500r/min. It also has advantages such as, adjusting time is short, efficient always remained at least 90% and has good stability and reliability. |
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