混合煤气调节阀液压伺服系统自适应控制研究
发布时间：2018-09-01 08:41
【摘要】：钢厂利用生产过程中产生的大量高炉和焦炉煤气实施燃气—蒸汽联合循环发电工程,既实现了废物利用,又减少了环境污染。在循环发电工程中,混合煤气的压力控制主要是通过大型气动薄膜调节阀实现的,受气动执行机构滞环特性和气体可压缩性大等因素的制约,煤气压力难以控制在系统允许的范围内,这成为影响发电设备正常运行的主要原因。针对该关键问题,利用电液执行机构精度高、速度快、动作稳的特点,提出了电液伺服控制调节阀技术。围绕此项技术,本文做了如下的研究工作： 首先,文章综述了钢厂循环发电工程及其存在的问题,介绍了调节阀技术的国内外研究现状,叙述了液压伺服控制系统的组成、特征及发展趋势,阐述了课题的研究意义。 其次,设计了调节阀的电液伺服控制系统,通过计算,确定了系统的主要技术参数,选择了合适的系统元器件。分别用两种方式建立系统数学模型,先利用机理建模方式建立了调节阀电液伺服控制系统的非线性数学模型,通过对系统Bode图的分析,表明系统具有稳定性。然后利用图形化建模仿真软件AMESim建立了系统的物理模型,这种方法更大程度地考虑了系统的细节问题,保证了仿真结果更接近实际状况。 再次,在获得传递函数的基础上,针对液压伺服系统非线性、时变的特点,以及常存在着参数变化和负载干扰等因素的影响,深入研究一种控制策略。将自适应控制理论中,基于广义误差具有可调增益的模型参考自适应控制方法应用到调节阀伺服控制系统,建立了调节阀电液伺服系统自适应控制模型,这种控制方法只需要根据被控对象输入量和输出量来设计自适应控制系统,保证了系统的稳定性。借助于Matlab/Simulink仿真平台进行系统动态响应的仿真研究,并利用AMESim控制软件接口实现AMESim与Matlab的联合仿真,结果表明,调节阀伺服控制系统动态特性满足循环发电工程的要求。 最后,搭建了调节阀电液伺服控制系统实验台,对调节阀控制系统的性能进行了相关实验研究。通过实验研究可以看出,模型参考自适应控制器具有较好的抗干扰性和自适应性。结果表明,针对钢厂循环发电工程中调节阀电液伺服控制系统应用自适应控制策略完全可行有效。
[Abstract]:A large number of blast furnace and coke oven gas produced in the production process are used in the steel plant to implement the combined gas-steam cycle power generation project, which not only realizes the waste utilization, but also reduces the environmental pollution. In the circulating power generation project, the pressure control of mixed gas is mainly realized by large pneumatic film regulating valve, which is restricted by the hysteresis characteristic of pneumatic actuator and the great compressibility of gas, etc. Gas pressure is difficult to be controlled within the allowable range of the system, which is the main reason that affects the normal operation of power generation equipment. Aiming at this key problem, the electro-hydraulic servo control valve technology is put forward by using the characteristics of high precision, fast speed and stable action of electro-hydraulic actuator. This paper has done the following research work around this technology: firstly, the paper summarizes the circulating power generation project and its existing problems in steel plant, and introduces the research status of regulating valve technology at home and abroad. The composition, characteristics and development trend of hydraulic servo control system are described. Secondly, the electro-hydraulic servo control system of the control valve is designed. The main technical parameters of the system are determined by calculation, and the appropriate system components are selected. Firstly, the nonlinear mathematical model of electro-hydraulic servo control system of regulating valve is established by means of mechanism modeling. By analyzing the Bode diagram of the system, it is shown that the system is stable. Then the physical model of the system is established by using the graphical modeling and simulation software AMESim. This method considers the details of the system to a greater extent and ensures that the simulation results are closer to the actual situation. Thirdly, on the basis of obtaining transfer function, a control strategy is deeply studied in view of the nonlinear and time-varying characteristics of hydraulic servo system, as well as the influence of parameter variation and load disturbance. In the adaptive control theory, the model reference adaptive control method based on the generalized error with adjustable gain is applied to the servo control system of the control valve, and the adaptive control model of the electro-hydraulic servo system of the control valve is established. This control method only needs to design the adaptive control system according to the input and output of the controlled object, which ensures the stability of the system. With the help of Matlab/Simulink simulation platform, the dynamic response of the system is simulated, and the joint simulation of AMESim and Matlab is realized by using the AMESim control software interface. The results show that the dynamic characteristics of the servo control system of the control valve can meet the requirements of the cycle power generation project. Finally, the control system of the control valve was set up, and the performance of the control system was studied. The experimental results show that the model reference adaptive controller has better anti-interference and self-adaptability. The results show that it is feasible and effective to apply adaptive control strategy to the electro-hydraulic servo control system of regulating valve in the circulating power generation project of steel plant.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137
本文编号：2216670
[Abstract]:A large number of blast furnace and coke oven gas produced in the production process are used in the steel plant to implement the combined gas-steam cycle power generation project, which not only realizes the waste utilization, but also reduces the environmental pollution. In the circulating power generation project, the pressure control of mixed gas is mainly realized by large pneumatic film regulating valve, which is restricted by the hysteresis characteristic of pneumatic actuator and the great compressibility of gas, etc. Gas pressure is difficult to be controlled within the allowable range of the system, which is the main reason that affects the normal operation of power generation equipment. Aiming at this key problem, the electro-hydraulic servo control valve technology is put forward by using the characteristics of high precision, fast speed and stable action of electro-hydraulic actuator. This paper has done the following research work around this technology: firstly, the paper summarizes the circulating power generation project and its existing problems in steel plant, and introduces the research status of regulating valve technology at home and abroad. The composition, characteristics and development trend of hydraulic servo control system are described. Secondly, the electro-hydraulic servo control system of the control valve is designed. The main technical parameters of the system are determined by calculation, and the appropriate system components are selected. Firstly, the nonlinear mathematical model of electro-hydraulic servo control system of regulating valve is established by means of mechanism modeling. By analyzing the Bode diagram of the system, it is shown that the system is stable. Then the physical model of the system is established by using the graphical modeling and simulation software AMESim. This method considers the details of the system to a greater extent and ensures that the simulation results are closer to the actual situation. Thirdly, on the basis of obtaining transfer function, a control strategy is deeply studied in view of the nonlinear and time-varying characteristics of hydraulic servo system, as well as the influence of parameter variation and load disturbance. In the adaptive control theory, the model reference adaptive control method based on the generalized error with adjustable gain is applied to the servo control system of the control valve, and the adaptive control model of the electro-hydraulic servo system of the control valve is established. This control method only needs to design the adaptive control system according to the input and output of the controlled object, which ensures the stability of the system. With the help of Matlab/Simulink simulation platform, the dynamic response of the system is simulated, and the joint simulation of AMESim and Matlab is realized by using the AMESim control software interface. The results show that the dynamic characteristics of the servo control system of the control valve can meet the requirements of the cycle power generation project. Finally, the control system of the control valve was set up, and the performance of the control system was studied. The experimental results show that the model reference adaptive controller has better anti-interference and self-adaptability. The results show that it is feasible and effective to apply adaptive control strategy to the electro-hydraulic servo control system of regulating valve in the circulating power generation project of steel plant.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137
【引证文献】
相关硕士学位论文 前1条
1 杨德金;一体化不压井修井机液压控制系统研究[D];沈阳工业大学;2013年
，本文编号：2216670
本文链接：https://www.wllwen.com/kejilunwen/jixiegongcheng/2216670.html
