AVP100型阀门定位器控制参数自整定技术研究

发布时间：2018-04-08 11:22

本文选题：阀门定位器　切入点：参数自整定　出处：《宁夏大学》2017年硕士论文

【摘要】：阀门定位器作为调节阀的配套设备,能很好地改善阀门的性能,提高控制精度,减少调节时间,在工业过程控制领域得到了广泛的应用。本文利用山武AVP100型阀门定位器的机械硬件部分,和吴忠仪表厂生产的AETS型调节阀作为研究的主体,自主设计控制算法程序,实现阀门的自动控制。在深入分析阀门定位器工作原理和开环阶跃响应测试结果的基础上,提出以一阶惯性加滞后的模型来表征实际的系统。运用两点法、切线法、特征面积法等离线系统辨识方法,获得数学模型的开环增益、惯性时间常数、滞后时间常数等三个参数。通过对比发现,以两点法获得的数学模型,在不同的时刻,均能较为准确的反应系统的实际运动情况。以Matlab为仿真工具,在Simulink模块中建立系统仿真试验,采用较为成熟的Z-N经验公式法、ITAE法、内模控制法等对PID控制算法进行参数整定,从理论层面上实现阀门定位器控制参数的自整定,为实验设计提供经验参考。搭建实验平台,以LabVIEW为编程软件,初步设计参数自整定控制算法。提出一种Bang-Bang控制算法,结果发现:基于Bang-Bang控制的PID算法,能减少正行程的调节时间,提高控制的精度,满足控制要求。
[Abstract]:The valve positioner, as the auxiliary equipment of the regulating valve, can improve the performance of the valve, improve the control precision and reduce the adjustment time. It has been widely used in the field of industrial process control.In this paper, the mechanical hardware part of the AVP100 valve positioner and the AETS type control valve produced by Wu Zhong instrument factory are used as the main body of the research, and the automatic control of the valve is realized by designing the control algorithm program independently.Based on the analysis of the working principle of the valve positioner and the test results of the open-loop step response, a model of first-order inertia plus hysteresis is proposed to characterize the actual system.By means of two-point method, tangent method and characteristic area method, the open loop gain, inertia time constant and hysteresis time constant of the mathematical model are obtained.It is found by comparison that the mathematical model obtained by the two-point method can accurately reflect the actual motion of the system at different times.Using Matlab as simulation tool, the system simulation test is established in Simulink module. The parameters of PID control algorithm are adjusted by using the more mature Z-N empirical formula method and internal model control method.The self-tuning of the control parameters of the valve positioner is realized theoretically, which provides an empirical reference for the experimental design.The experiment platform is built and the parameter self-tuning control algorithm is designed with LabVIEW as the programming software.A Bang-Bang control algorithm is proposed. It is found that the PID algorithm based on Bang-Bang control can reduce the adjustment time of the positive stroke, improve the control accuracy and meet the control requirements.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH134

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