共查询到17条相似文献,搜索用时 252 毫秒
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基于广义Hermite-Biehler定理,由二阶时滞对象的逆Nyquist曲线,可确定PID控制器比例增益的稳定范围;在积分和微分增益平面上,运用一组不等式可确定该二维平面上参数的稳定区域,从而给出了确定二阶时滞系统PID控制器参数稳定域的方法.在此基础上,针对稳定裕量指标,也给出相应的PID控制器稳定域的处理方法.... 相似文献
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针对火电厂锅炉水质调节过程的大时滞时变特性,常规控制算法控制效果不好的问题,本文提出了基于BP神经网络的Smith-PID鲁棒自适应控制算法,利用BP神经网络的任意非线性表达能力和很强的自学习能力,在线自学习整定PID参数,被控对象不需要精确辩识,控制器参数跟踪被控对象自适应调整,克服了常规PID算法不适用于大时滞过程控制和常规Smith预估补偿控制对模型不确定性敏感的缺陷.MATLAB仿真表明,本文控制算法的静态特性、动态品质良好,鲁棒性强. 相似文献
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一种确定PID参数稳定域的图解法 总被引:1,自引:0,他引:1
针对带滞后因子的一阶惯性环节的PID控制器,给出确定其参数稳定域的一种图解方法.基于参数空间的图解稳定性准则,在已知比例增益范围的前提下,针对稳定和不稳定开环对象,直接在积分-微分参数空间绘制和确定稳定区域,避免了复杂的数学计算.该图解稳定性准则给出闭环稳定的一个充分必要条件,所得结果没有任何保守性.此方法也可用来求解系统的相对稳定度问题和应用于其他任意给定被控对象. 相似文献
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为了利用PID控制获得先进的控制性能,将广义预测控制(GPC)用于PID参数的实时优化,在此基础上提出了一种新的基于GPC的自适应PID控制器的设计方法.该PID控制器具有时变的比例增益,并且PID控制器的设计利用了GPC的未来参考输入.因此,GPC控制律能由设计的PID控制器精确实现.为使GPC控制器稳定地获得比例增益,采用了基于互质因子分解扩展的强稳定GPC,独立于利用标准GPC设计的闭环系统而重新设计GPC控制器,保证了闭环系统的稳定性.此外,利用递推最小二乘法对系统进行在线辨识,修正模型参数,增强了系统的抗扰性.以一阶时滞非最小相位系统为被控对象,在Matlab中对该设计方法进行了仿真,仿真结果验证了该方法的有效性. 相似文献
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一阶时滞不稳定过程的复合PID控制 总被引:4,自引:0,他引:4
针对一阶时滞不稳定过程讨论了一类复合PID控制及其参数整定公式.该方法基于分步设计的思想,在比例控制器镇定基础上对闭环所构成的广义稳定对象,设计二级PID控制器.在二级控制器设计中,通过引入时滞二阶稳定模型优化PID参数.本文同时讨论了等价的二自由度PID控制器. 相似文献
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倒立摆本身是一个自然不稳定系统,时滞的存在更加恶化了系统性能。基于牛顿动力学方法建立了具时滞单级倒立摆系统的动力学模型,运用线性二次型最优控制策略设计了倒立摆控制器,将时滞环节采用Padé一阶对称逼近,通过Routh稳定判据,得到闭环系统的临界稳定的时滞大小。通过实例仿真进行验证,并与PID控制策略相比较,结果表明本文方法正确,所设计的最优控制器性能优于PID控制器,在临界时滞范围内有较好的控制效果,但与无时滞时相比,系统的动态性能有所降低。 相似文献
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Yongji Wang M. Schinkel Tilmann Schmitt‐Hartmann Ken J. Hunt 《Asian journal of control》2002,4(4):423-432
This paper presents a new PID and PID‐like controller design method that permits the designer to control the desired dynamic performance of a closed‐loop system by first specifying a set of desired D‐stable regions in the complex plane and then running a numerical optimisation algorithm to find the controller parameters such that all the roots of the closed‐loop system are within the specified regions. This method can be used for stable and unstable plants with high order degree, for plants with time delay, for controller with more than three design parameters, and for various controller configurations. It also allows a unified treatment of the controller design for both continuous and discrete systems. Examples and comparative simulation results are provided to illustrate its merit. 相似文献
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Fed-batch fermentation processes are commonly used in bioprocessing industry. A fed-batch fermentation process often exhibits integrating/unstable type of dynamics with multiple right-half plane zeros. A class of fourth-order integrating model can be used to adequately represent such a complex dynamics of the fed-batch fermentation process. In this paper, rigorous stability analysis of proportional-integral-derivative (PID) controller based on the Routh-Hurwitz criteria for the fourth-order integrating system is presented. A set of all stabilising PID controller parameter regions is established. Based on these stabilising regions, a general PID controller tuning procedure is proposed for the fourth-order integrating system with two right-half plane zeros. Numerical study shows that based on the proposed tuning procedure, a low-order PID controller can outperform a fifth-order optimal LQG controller in terms of servo and regulatory controls. 相似文献
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Time delays are encountered in many physical systems, and they usually threaten the stability and performance of closed-loop systems. The problem of determining all stabilising proportional-integral-derivative (PID) controllers for systems with perturbed delays is less investigated in the literature. In this study, the Rekasius substitution is employed to transform the system parameters to a new space. Then, the singular frequency (SF) method is revised for the Rekasius transformed system. A novel technique is presented to compute the ranges of time delay for which stable PID controller exists. This stability range cannot be readily computed from the previous methods. Finally, it is shown that similar to the original SF method, finite numbers of singular frequencies are sufficient to compute the stable regions in the space of time delay and controller coefficients. 相似文献
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In this article we present a graphical tuning method of PI/PID controller for first order and second order plus time delay systems using dominant pole placement approach with guaranteed gain margin (GM) and phase margin (PM). The stability equation method and gain phase margin tester have been used to portray constant GM and PM boundaries. The PID controller parameters have been obtained for different dominant poles and plotted graphically in the parameters plane of controller within the specified GM and PM regions. To demonstrate the effectiveness and confirm the validity of the proposed methodology, three examples with numerical simulations are presented. 相似文献