基于变频控制的风电叶片模具液压翻转机构电液系统研究

发布时间：2018-09-14 16:55

【摘要】：大型风电叶片模具分上下两半，它是生产风电叶片的专用设备，生产中上半模具翻转实现两模具合并。液压翻转系统的使用改变天车翻转模具的工况，大大提高了风电叶片的生产效率。但是现有模具液压翻转系统的不足之处是：翻转过程角速度不平稳、同步性差，引起模具机构变型，进而导致所生产叶片质量问题；同时，液压系统溢流节流大，效率低，系统发热严重。因此，实现现有模具液压翻转的角速度平稳、多架同步、节能是有必要的。本文以“理论分析——模拟仿真——现场实验验证”为主线，以理想翻转运动为目标，对现有的翻转机械结构进行运动学分析，得出在理想运动中翻转机构各个物理量之间的关系。结合所得的各个物理量间关系，从变频器-异步电机驱动出发，完成液压翻转系统的原理设计，进而建立液压系统仿真模型。其次，本文提出变频电机控定量泵调速方案。针对变频电机控定量泵常用的V/f控制方式、转差频率控制、矢量控制等控制方法，分析比较将其各自应用于本系统的优缺点，得出矢量控制更适用于液压翻转系统的结论。从矢量变频原理出发建立本设计的矢量变频器-三相异步电动机数学与仿真模型，在此基础上提出符合工程设计的简化仿真模型，并进行相应的仿真工作。最后，结合液压系统仿真模型和变频器-电机简化仿真模型，进行单翻转架匀速翻转PID控制仿真分析，针对仿真结果中机构奇异点抖动的问题，引入了模糊-PID复合控制，仿真及实验结果表明，，模糊-PID复合控制对于改善翻转过程中奇异点抖动现象更具优势，所以最终选择模糊-PID复合控制。同时也对双翻转架同步控制进行控制策略研究，确定了等同主从结合的策略。并提出控制策略在工程控制软件中的实现方法。
[Abstract]:The mold of large wind turbine blade is divided into two parts. It is a special equipment for producing wind power blade. The use of hydraulic turning system changes the working condition of the turning die of crane and greatly improves the production efficiency of wind turbine blade. However, the shortcomings of the existing hydraulic turnover system of die are that the angular velocity is not steady and the synchronism is poor in the process of overturning, which causes the mould mechanism to change, and then leads to the quality problem of the blade produced; at the same time, the overflow of the hydraulic system has large throttling and low efficiency. The system is feverish. Therefore, it is necessary to achieve stable angular speed, synchronous and energy saving of existing die hydraulic turnover. This paper takes "theoretical analysis-simulation-field experiment verification" as the main line, takes ideal turnover motion as the target, carries on the kinematics analysis to the existing turning machine structure. The relationship between the physical quantities of the flip mechanism in the ideal motion is obtained. Based on the relationship between the various physical quantities, the principle design of hydraulic flip system is completed from the drive of inverter and asynchronous motor, and the simulation model of hydraulic system is established. Secondly, this paper puts forward the speed regulation scheme of variable-frequency motor-controlled quantitative pump. Aiming at the control methods such as V / f control mode, transposition frequency control, vector control and so on, the advantages and disadvantages of their application in this system are analyzed and compared, and the conclusion that vector control is more suitable for hydraulic flipping system is obtained. Based on the principle of vector frequency conversion, the mathematical and simulation model of vector inverter-three-phase asynchronous motor is established. On this basis, a simplified simulation model in accordance with the engineering design is proposed, and the corresponding simulation work is carried out. Finally, combining the simulation model of hydraulic system and the simplified simulation model of inverter and motor, the simulation analysis of single flipping frame uniform speed flipping PID control is carried out. Aiming at the problem of singularity point jitter of mechanism in the simulation result, the fuzzy-PID compound control is introduced. The simulation and experimental results show that the fuzzy-PID compound control has more advantages in improving the singularity jitter in the flipping process, so the fuzzy-PID compound control is chosen finally. At the same time, the control strategy of synchronous control of double flipping frame is studied, and the strategy of equivalent master-slave combination is determined. The realization method of control strategy in engineering control software is put forward.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.7

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