共查询到20条相似文献,搜索用时 197 毫秒
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窦艳艳 《电子制作.电脑维护与应用》2022,(2):18-19
本文利用MATLAB/Simulink工具对双容水箱液位控制系统进行了单回路PID控制、串级PID控制、基于Smith预估器的PID控制仿真和对比分析.仿真结果表明:对于控制双容水箱液位系统等大延迟二阶对象系统时,基于Smith预估器的PID控制方法和串级PID控制方法都是比较有效的. 相似文献
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基于力控组态软件的液位控制系统 总被引:3,自引:0,他引:3
建立了双容水箱系统的数学模型,采用串级控制方案对双容水箱液位系统进行控制,控制算法采用数字PID.确定了硬件设备,制作了双容水箱液位控制系统.采用力控5.0版组态软件,对整个液住控制系统进行组态,构成控制精度高,显示直观的双容液位系统. 相似文献
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针对THJ-2双水箱液位系统,用MATLAB/Simulink建立了液位串级控制系统,其主调节器采用模糊PID控制,副调节器采用比例控制。并用组态软件MCGS实现了模糊PID控制算法。实验结果表明,与常规PID控制和模糊控制相比,模糊PID控制具有鲁棒性强和动态性能好等特点。 相似文献
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张亚锋 《电子制作.电脑维护与应用》2015,(10)
本文设计了基于PID串级液位控制的MATLAB仿真系统,利用自动控制技术,实现对三级水箱液位进行串级控制的仿真测试,并且建立三容水箱的模型,采用实验建模法求取模型的传递函数,通过MATLAB软件对PID串级液位控制过程进行仿真,验证了串级控制对提高系统性能的作用。 相似文献
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双容水箱液位DMC-PID串级控制仿真研究 总被引:2,自引:0,他引:2
双容水箱作为工业过程控制中常见的被控对象,其液位控制具有大惯性滞后、系统参数时变的特点,且经常受到来自外界水压频繁波动的干扰,常规算法很难对其进行控制.对此,采用动态矩阵控制( DMC)与PID控制相结合的DMC-PID控制方案,使被控系统具有良好的动态调节品质和很强的鲁棒性.Matlab仿真结果表明,该串级控制系统取得了较为理想的控制效果,满足控制要求,具有较好的实用价值. 相似文献
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针对工业环境中的液位控制问题,设计了一种水箱液位控制系统装置,利用OPC技术将MATLAB和PLC控制系统进行集成,使用MATLAB/Simulink中的OPC工具箱及其他模块来进行液位控制系统的搭建,并采用多模型自适应预测控制方案实现了双容水箱液位的预测控制。根据双容水箱系统建立了机理模型,并通过MATLAB系统辨识工具箱对系统模型进行了参数辨识,得到双容水箱的输入输出模型,从而进行液位控制的模型预测控制研究。实际控制结果表明,多模型自适应预测控制与单模型预测控制相比,前者的响应加快,超调量减少,性能更优。 相似文献
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针对双容水箱闭环控制系统,通过机理分析方法建立了被控对象和控制通道的状态方程数学模型,通过差分方法对模型进行数字化,不必进行非线性处理,直接按时序进行递推求解,从而有效简化了模型的数学处理过程,并利用组态软件脚本语言,分别编制了被控制对象和控制通道各单元仿真程序,实现了双容水箱液位控制系统的仿真。仿真系统具有实时性和在线性特点,操作过程与实际生产操控形式完全相同,可连续对干扰和设定值变化进行在线仿真,仿真系统对于实际控制系统PID参数整定以及生产操作人员的培训具有重要的参考价值。 相似文献
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敖茂尧 《计算机测量与控制》2014,(1)
串级液位控制系统是工业过程控制中最典型的系统,针对该系统具有不确定性和时变性的特点,首先在分析串级液位控制系统的结构和控制原理的基础上,采用实验建模的方法建立了系统的数学模型;然后充分利用PID结构简单、抗干扰能力强的特点以及神经网络具有自学习和自适应的特长,引入粒子群算法对网络权值进行优化,提出了一种基于改进粒子群算法的神经网络PID控制器,既克服了BP神经网络收敛速度慢,容易陷入局部极小值的缺点,也克服了粒子群算法容易陷入局部最优的缺点;最后在MATLAB环境下进行串级液位系统的仿真试验对系统的性能进行分析,实验结果表明,该控制算法具有良好的实时性、鲁棒性,抗干扰能力强,显著提高了系统的性能指标。 相似文献
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Hua-Cheng Zhou 《International journal of control》2019,92(1):12-26
ABSTRACTIn this paper, we consider stabilisation for a cascade of ODE and first-order hyperbolic equation with external disturbance flowing to the control end. The active disturbance rejection control (ADRC) and sliding mode control (SMC) approaches are adopted in investigation. By ADRC approach, the disturbance is estimated through a disturbance estimator with both time-varying high gain and constant high gain, and the disturbance is canceled online in the feedback loop. It is shown that the resulting closed-loop system with time-varying high gain is asymptotically stable and is practically stable with constant high gain. By SMC approach, the existence and uniqueness of the solution for the closed loop via SMC are proved, and the monotonicity of the ‘reaching condition’ is presented. The resulting closed-loop system is shown to be exponentially stable. The numerical experiments are carried out to illustrate effectiveness of the proposed control law. 相似文献
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研究采用串级PID控制的奇异摄动磁悬浮系统参数稳定范围.首先给出磁悬浮系统的串级PID控制算法与模型,讨论了系统稳定应该遵循的两个条件:一个是慢变子系统PID控制的渐近稳定条件,另一个是快变子系统电流环稳定条件,从而推导出基于串级PID控制的磁悬浮系统所应遵循的参数稳定范围和摄动参数稳定上界.结论说明由于电流环稳定条件与PID稳定条件存在较强耦合,对系统固有参数要求较为严格,导致实际系统调试难度较大. 相似文献
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为解决现有煤矿皮带机传动系统占地空间大、传动效率低、维护频度高等问题,提出一种外转子永磁同步电机(outer-rotor PMSM)直接驱动结构,并将一种串级结构的无模型自适应控制算法应用到皮带机驱动电机的速度控制中。根据矿井皮带机的运行要求,给出该电机详细的设计参数和数学模型,设定了启动和稳态时的理想速度曲线。利用无模型自适应控制算法设计出串级无模型自适应控制律,并给出串级控制系统结构图。通过Matlab软件对外转子PMSM在煤矿皮带机的直驱伺服系统按照理想的启动“S”型曲线进行仿真,其结果表明:串级无模型自适应控制算法降低了速度跟踪误差,提高了调速控制精度,有效地抑制了系统噪声和负载变化带来的干扰,实现了皮带机良好的启动和稳态特性。 相似文献
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Parallel cascade control strategies, to improve the dynamic performance of a control system, have been proposed earlier mainly for control of stable processes. In this paper, further results are presented for a new parallel cascade control structure and controller design for controlling stable, unstable or integrating processes with time delay. The design of the disturbance rejection controllers and the setpoint filter are based on loop shaping and ISE performance measures, respectively. A modified Smith predictor scheme is used in the primary loop to enhance the closed-loop performance of the system. The stabilization, robustness and performances of time delay processes are analyzed. The disturbance rejection capability of the proposed scheme is superior as compared to some existing methods. Examples are given to illustrate the usefulness of the proposed method and its superiority over some parallel cascade control schemes. 相似文献
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Boundary stabilization of a cascade of ODE‐wave systems subject to boundary control matched disturbance
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In this paper, we are concerned with a cascade of ODE‐wave systems with the control actuator‐matched disturbance at the boundary of the wave equation. We use the sliding mode control (SMC) technique and the active disturbance rejection control method to overcome the disturbance, respectively. By the SMC approach, the disturbance is supposed to be bounded only. The existence and uniqueness of solution for the closed‐loop via SMC are proved, and the monotonicity of the ‘reaching condition’ is presented without the differentiation of the sliding mode function, for which it may not always exist for the weak solution of the closed‐loop system. Considering that the SMC usually requires the large control gain and may exhibit chattering behavior, we then develop an active disturbance rejection control to attenuate the disturbance. The disturbance is canceled in the feedback loop. The closed‐loop systems with constant high gain and time‐varying high gain are shown respectively to be practically stable and asymptotically stable. Then we continue to consider output feedback stabilization for this coupled ODE‐wave system, and we design a variable structure unknown input‐type state observer that is shown to be exponentially convergent. The disturbance is estimated through the extended state observer and then canceled in the feedback loop by its approximated value. These enable us to design an observer‐based output feedback stabilizing control to this uncertain coupled system. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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《Engineering Applications of Artificial Intelligence》2003,16(5-6):425-430
Fuzzy model based predictive functional controller (FPFC) is applied to the magnetic suspension system—a pilot plant for magnetic bearing. High quality control requirements are short settle time with a-periodical step response and zero steady-state error. Open loop unstable process was stabilised with linear lead compensator. The FPFC was used as a cascade controller. Due to some model uncertainties, the Takagi–Sugeno fuzzy model of stabilised system was obtained using fuzzy identification. Comparing to PID, it improved quality and robustness performance. With its computational efficiency, it proved to be ideal solution for high sampling frequency systems. 相似文献
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针对恒温水浴高精度温度控制要求,设计了一种新型恒温水箱智能测控系统.系统采用MSP430单片机作为核心,使用Pt100温度传感器为测温元件,以半导体致冷器(TEC)为制冷元件,结合比例-积分-微分(PID)算法和脉宽调制(PWM)控制来实现对目标对象温度的精确控制.系统测温范围设定在0~60℃,样机性能测试结果表明:该系统可以实现测温精度优于±0.05℃的控制要求,具有±0.01℃的分辨率,控温精度±0.2 ℃.实际应用表明:该系统可靠性好、控制精度高、性能稳定、操作简便及通用性强,具有较高的实用价值和应用推广价值. 相似文献
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A data-driven design method for a cascade control system is proposed. The cascade control system consists of inner and outer loops, where the control interval of the outer loop is an integer multiple of the inner loop; hence, the system is a dual-rate system. In the proposed method, controllers in the inner and outer loops are designed based on one-shot data. In such a dual-rate cascade system, since the controllers are designed using different data-rate signals, the lifting technique is applied to align the dual-rate data. To show its effectiveness, the proposed method is compared with a conventional single-rate cascade control method, and numerical simulations and experiments are presented to examine servo and regulation performance. 相似文献