共查询到20条相似文献,搜索用时 796 毫秒
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过程控制中的一种预测控制算法仿真研究 总被引:1,自引:3,他引:1
随着预测控制在过程控制中的应用,预测控制在算法和理论研究上取得了很大的进展。本文主要采用动态矩阵控制算法设计预测控制器,并分析动态矩阵控制算法各参数对系统控制品质的影响。仿真实例表明,通过合适的参数设计,它能得到好的控制效果。 相似文献
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动态矩阵控制算法是一种基于对象阶跃响应的预测控制算法,适用于控制系统复杂、数学模型难以精确建立的过程。针对输入/输出无约束的模型控制器设计,采用动态矩阵控制方法,包括预测模型、滚动优化、误差校正和闭环控制形式。通过MATLAB对它的仿真,验证了闭环系统鲁棒性较好,系统性能容易满足要求。结果表明,动态矩阵预测控制算法控制明显,因此是一种最优控制技术。 相似文献
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具有预测控制功能的pH控制系统 总被引:6,自引:1,他引:5
介绍了糖厂酸碱中和的酸度控制系统以及采用动态矩阵控制算法设计的预测控制器。对系统硬件配置动态矩阵控制算法及参数设计作了具体说明,给出了仿真和实际运行结果。 相似文献
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将动态矩阵控制算法与串级控制系统相结合,在串级控制的主、副回路中均采用动态矩阵控制算法(DMC)进行控制.经仿真证明,该DMC-DMC串级控制算法具有快速的动态响应,控制效果较好. 相似文献
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基于PMAC的模糊自整定PID算法设计 总被引:1,自引:0,他引:1
在工业控制系统优化设计中,可编程多轴运动控制器(Programmable multi-axes controller,PMAC)系统采用脉冲+方向的控制方法,控制精度要求高,对稳态特性及动态特性要求很严格,其工作环境较为复杂,固定的PID参数工作适应性差,很难满足控制要求.为提高控制精度和性能,提出采用PMAC的PID控制算法及参数整定,设计出一种结合PMAC的自适应PID控制算法,对环境条件的变化,对负载变化和系统干扰有一定的适应性,且能自动矫正控制动作,满足系统控制要求.通过PMAC运动控制器的嵌入式PLC程序实现算法,仿真结果表明,自整定模糊PID控制算法很好地改善了伺服系统的稳定性和静、动态特性,达到了很好的控制效果. 相似文献
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The problem of robust adaptive predictive control for a class of discrete-time nonlinear systems is considered. First, a parameter estimation technique, based on an uncertainty set estimation, is formulated. This technique is able to provide robust performance for nonlinear systems subject to exogenous variables. Second, an adaptive MPC is developed to use the uncertainty estimation in a framework of min–max robust control. A Lipschitz-based approach, which provides a conservative approximation for the min–max problem, is used to solve the control problem, retaining the computational complexity of nominal MPC formulations and the robustness of the min–max approach. Finally, the set-based estimation algorithm and the robust predictive controller are successfully applied in two case studies. The first one is the control of anonisothermal CSTR governed by the van de Vusse reaction. Concentration and temperature regulation is considered with the simultaneous estimation of the frequency (or pre-exponential) factors of the Arrhenius equation. In the second example, a biomedical model for chemotherapy control is simulated using control actions provided by the proposed algorithm. The methods for estimation and control were tested using different disturbances scenarios. 相似文献
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预测控制算法的内模结构及其统一格式 总被引:14,自引:1,他引:13
本文应用内模控制(IMC)原理,研究了现有各类预测控制算法IMC、MAC、DMC、GPC、GPP的控制器方程,闭环系统输入输出和误差方程,归纳出它们的统一算式,为理解各类预测控制算法的内在联系及进一步研究提供了方便. 相似文献
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本文介绍了简化模型预测控制算法SM-PC,指出SMPC算法是作为克服内部模型控制(IMC)因式分解中求取过程传函逆阵费时等缺点而推出的一种简化算法。将本算法通过对一个多侧线精馏塔进行仿真,结果表明此算法具有良好的控制效果 相似文献
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《Journal of Process Control》2014,24(8):1237-1246
In this paper, we develop a tube-based economic MPC framework for nonlinear systems subject to unknown but bounded disturbances. Instead of simply transferring the design procedure of tube-based stabilizing MPC to an economic MPC framework, we rather propose to consider the influence of the disturbance explicitly within the design of the MPC controller, which can lead to an improved closed-loop average performance. This will be done by using a specifically defined integral stage cost, which is the key feature of our proposed robust economic MPC algorithm. Furthermore, we show that the algorithm enjoys similar properties as a nominal economic MPC algorithm (i.e., without disturbances), in particular with respect to bounds on the asymptotic average performance of the resulting closed-loop system, as well as stability and optimal steady-state operation. 相似文献
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Gasoline direct injection (GDI) is a pivotal technique for a highly efficient engine. However, how to maintain a stable rail pressure which offers good fuel economy and low emissions, is still a challengeable work. In this paper, a rail pressure controller is designed basing on predictive functional control (PFC), a model predictive control (MPC) method, to surmount the nonlinearity and discontinuity brought by the common rail pressure system (CRPS). A control-oriented piecewise linear model is presented to simplify the CRPS. The simulation results on a benchmark show that rail pressure tracks the setpoint accurately even with some perturbations. Profiting from the conciseness of PFC algorithm, the controller can compute the online solution in a short time, which makes it possible to realize the strategy on a fast response system. 相似文献
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In this paper, we define several instances of model predictive control (MPC) for linear systems, including both deterministic and stochastic formulations. We show by explicit computation of the associated control laws that, under certain conditions, different formulations lead to identical results. This paper provides insights into the performance of stochastic MPC. Amongst other things, it shows that stochastic MPC and traditional MPC can give identical results in special cases. In cases where the solutions are different, we show that the explicit formulation of the problem can give insight into the performance gap. 相似文献