卷接机组工艺风力与除尘系统自适应PID控制的实现

对卷烟厂卷接机组工艺风力与除尘系统进行了描述,指出了其常规PID控制系统存在的缺点,分析了自适应PID控制原理和偏差等级划分的原因,给出了PLC自适应控制程序流程.在此基础上,设计了基于偏差等级的自适应PID控制系统,满足了系统受到扰动时,除尘主管内风压、风量能快速恢复到烟机正常生产所要求的状态.     

电子束快速成型温度自适应模糊PID控制系统

将自适应模糊PID控制技术应用于电子束快速成型温度控制系统中,通过温度采集装置实时得到被加工件的温度信号,与设定值进行对比从而得到温度偏差及偏差的变化率,将温度偏差及偏差的变化率作为模糊控制器的2个输入变量,以自适应模糊PID控制器输出控制量调节电子束流大小,实现电子束快速成型温度的闭环控制.仿真结果表明,该控制系统具有调整时间短、稳态误差小、超调量小,即在电子束快速成型过程中,采用自适应模糊PID控制器比采用传统的PID控制器或模糊控制器可以得到更好的动态响应性能和控制精度.     

基于模糊自适应整定PID的活套高度控制系统

针对板带热连轧机传统活套高度控制策略存在的问题,提出用模糊自适应整定PID的控制策略．控制器输入取活套量的偏差e和偏差变化率ec,输出取PID控制器3个参数的修正量,从而实现了PID参数的在线自整定．通过MATLAB语言,进行了传统PID控制与模糊自适应整定PID控制动态性能的仿真比较,结果表明采用模糊自适应整定PID控制可明显提高活套高度控制系统的动态性能．     

模糊自适应PID在水工模型中的应用

水工模型水位控制系统是一个典型的非线性、大时滞控制系统,针对用普通PID对高阶大惯性环节对象的控制参数难以整定的问题,设计了一种基于模糊控制原理的PID参数自适应控制器,根据偏差和偏差变化率来实时调整Kp,Ti,Td参数。试验结果表明,这种模糊自适应PID控制器比常规PID控制器有更好的控制效果,大大改善了系统的动态和稳态性能。     

基于模糊九点控制器的自适应控制系统设计方法研究

由于传统自适应PID控制算法在线调节PID的三个参数难度较大,现将模糊九点控制器加入到自适应控制系统中,根据系统偏差e和偏差变化率ec的不同,将系统状态分为九神情况,运用模糊九点控制器进行参数自整定,调节系统在不同状态下的控制特性.该控制方法不依赖数学模型,切实有效,具有稳定型好,调节精度高等特点,是一种表达人类控制思...     

基于PLC的自适应模糊-PID压力控制系统

本文在传统PID控制技术和模糊控制技术的基础上,吸收两者长处,设计了自适应模糊-PID控制器,并将其应用于压力控制中。基于S7-200PLC的自适应模糊-PID压力控制系统,以偏差和偏差变化率作为输入,根据被控系统不同工况变化的要求,通过修改PID控制器的参数来获得满意的动态和静态控制性能。     

锅炉汽包水位三冲量自适应模糊PID控制

本文主要研究了用辅助信号自消方法和辅助信号对消方法来消除水位偏差。设计了三冲量自适应模糊PID控制器对汽包水位进行控制。通过MATLAB对传统PID控制系统和三冲量自适应模糊PID控制系统仿真,结果表明后者的自适应能力更强,抗干扰能力和鲁棒性更好,保证水位的稳定。     

水下推进器控制系统设计

水下推进器控制系统是复杂、非线性、时变、耦合且对控制策略要求很高的控制系统,常规PID控制很难满足控制要求.针对水下螺旋桨型推进器控制系统提出了一种经改进的模糊PID参数自适应整定控制方式,并利用MATLAB/Simulink软件平台进行了建模与仿真.仿真结果表明,模糊PID参数自适应整定控制的控制效果明显优于常规PID控制和单纯的模糊自适应控制方式.经比较和分析得知,所提出的控制算法具有良好的鲁棒性和实时性,从而验证了改进控制算法的可行性和有效性.     

基于自适应模糊PID运动控制系统的设计

内容为了提高四轮驱动机器人的速度控制性能和红外循迹轨迹跟踪响应效果,将传统PID控制和模糊推理相结合,设计了一种基于自适应模糊PID的四轮驱动循迹控制系统,介绍了系统总体结构和模糊控制理论,设计了一种自适应模糊PID控制器,给出了以转速为内环,位置偏差为外环的双闭环模糊控制方法,利用simulink对模糊PID算法的控制效果进行了仿真,并在四轮驱动控制系统试验平台上进行速度控制实验和循迹动态响应实验研究,结果表明本文所设计的自适应模糊PID相对于传统PID响应更快,减少系统稳态误差,提高移动平台的红外循迹过程中的轨迹跟踪动态响应效果。     

PID控制器参数优化算法的仿真研究

研究PID控制器参数优化问题,现代控制对象具有复杂非线性、时变性特点,引起系统的输出品质特性差,超调大稳定性时间长,控制精度差等.传统PID控制是针对线性控制系统提出的,控制精度比较低.为了提高PID控制精度,基于神经网络提出PID控制器参数自适应优化方法.通过将系统控制偏差和PID控制器的3个参数作为神经网络的输入,最优控制性能作为优化目标,通过神经网络自身学习和加权系数调整,获得最优控制性能的PID控制器参数.仿真结果表明,神经网络的PID控制方法提高了系统控制精度,系统响应速度更快,具有很强的自适应性和鲁棒性,为优化控制系统提供了参考.     

Robust FOPID controller design for fractional‐order delay systems using positive stability region analysis

In this paper, a robust fractional‐order PID (FOPID) controller design method for fractional‐order delay systems is proposed based on positive stability region (PSR) analysis. Firstly, the PSR is presented to improve the existing stability region (SR) in D‐decomposition method. Then, the optimal fractional orders λ and μ of FOPID controller are achieved at the biggest three‐dimensional PSR, which means the best robustness. Given the optimal λ and μ, the other FOPID controller parameters k_p, k_i, k_d can be solved under the control specifications, including gain crossover frequency, phase margin, and an extended flat phase constraint. In addition, the steps of the proposed robust FOPID controller design process are listed at length, and an example is given to illustrate the corresponding steps. At last, the control performances of the obtained robust FOPID controller are compared with some other controllers (PID and FOPI). The simulation results illustrate the superior robustness as well as the transient performance of the proposed control algorithm.     

Non-fragile multivariable PID controller design via system augmentation

In this paper, the issue of designing non-fragile H_∞ multivariable proportional-integral-derivative (PID) controllers with derivative filters is investigated. In order to obtain the controller gains, the original system is associated with an extended system such that the PID controller design can be formulated as a static output-feedback control problem. By taking the system augmentation approach, the conditions with slack matrices for solving the non-fragile H_∞ multivariable PID controller gains are established. Based on the results, linear matrix inequality -based iterative algorithms are provided to compute the controller gains. Simulations are conducted to verify the effectiveness of the proposed approaches.     

Application of flower pollination algorithm in load frequency control of multi-area interconnected power system with nonlinearity

This work presents an application of bio-inspired flower pollination algorithm (FPA) for tuning proportional–integral–derivative (PID) controller in load frequency control (LFC) of multi-area interconnected power system. The investigated power system comprises of three equal thermal power systems with appropriate PID controller. The controller gain [proportional gain (K _p), integral gain (K _i) and derivative gain (K _d)] values are tuned by using the FPA algorithm with one percent step load perturbation in area 1 (1 % SLP). The integral square error (ISE) is considered the objective function for the FPA. The supremacy performance of proposed algorithm for optimized PID controller is proved by comparing the results with genetic algorithm (GA) and particle swarm optimization (PSO)-based PID controller under the same investigated power system. In addition, the controller robustness is studied by considering appropriate generate rate constraint with nonlinearity in all areas. The result cumulative performance comparisons established that FPA-PID controller exhibit better performance compared to performances of GA-PID and PSO-PID controller-based power system with and without nonlinearity effect.

     

PID Stabilization of Retarded‐Type Time‐Delay System

An analytical method is proposed to construct the stabilizing PID region of a retarded‐type time‐delay system, based on Pontryagin's results and a generalization of the Hermite‐Biehler theorem. It is shown that the stable region in the (k_i, k_d)‐plane is made up of some convex polygons for a fixed k_p, and the whole region in the (k_p, k_i, k_d)‐space is comprised of some polyhedrons, each of which is mapped onto a real used string. Additionally, a method for determining the feasible k_p‐intervals is given in this paper. Two examples are employed to illustrate and verify the construction procedure of the stabilizing PID region in detail.     

自适应模糊PID前馈补偿在机载挂飞摆扫转台控制中的应用

针对机载挂飞转台的摆扫速度控制问题,提出了一种利用模糊自适应PID技术进行前馈补偿的复合控制策略。首先根据实际应用提出摆扫转台的期望摆扫速度曲线,并对直流力矩电机驱动的摆扫转台进行了建模;然后根据扰动前馈补偿的控制原理,提出了模糊自适应PID前馈补偿方法,为摆扫转台的速度环设计了模糊PID控制器,并在此基础上设计了与之相适应的的自适应前馈补偿函数;最后进行了仿真结果验证。通过Matlab仿真结果表明,相对于模糊PID控制,所设计的模糊自适应PID前馈补偿控制器能有效的跟踪期望的转台摆扫速度,大幅地提高了在有稳定干扰和摆扫速度越变情况下的跟踪精度。     

All stabilizing PID controllers for time delay systems

This paper presents a method to compute the entire set of stabilizing PID controller parameters for an arbitrary (including unstable) linear time delay system. The main contribution is to handle the infinite number of stability boundaries in the (k_d,k_i)-plane for a fixed proportional gain k_p. For retarded open loops, it is shown that the stable region in the (k_d,k_i)-plane consists of convex polygons. Concerning neutral loops, a new phenomenon is introduced. For certain systems and certain k_p, the exact stable region in the (k_d,k_i)-plane can be described by the limit of a sequence of polygons with an infinite number of vertices. This sequence may be well approximated by convex polygons. Moreover, the paper describes a necessary condition for k_p-intervals potentially having a stable region in the (k_d,k_i)-plane. Thus, the set of stabilizing controller parameters can be calculated after gridding k_p in these intervals. A Matlab tool implementing the presented method is available.     

用模糊控制自整定PID参数的研究

针对复杂的非线性时变系统,研究了将模糊系统与普通PID相结合的自适应模糊PID控制系统,总结了该控制器的设计过程及设计方法。仿真结果表明,这种控制器是一种易于理解、便于实现、性能良好的控制器,能适用于非线性、时变、较强干扰的复杂系统。     

X-Q自适应PID及其在多目标满意控制系统中的应用

给出一种新型X-Q自适应控制器,它具有新颖的自适应频率特性对于控制信号而言,它是一个没有任何相位落后的PID,且高频段为一放大倍数为k的放大器,低频段为一积分时间常数为     

Independent tracking and regulation adaptive control with forgetting factor

This paper considers a discrete-time adaptive control algorithm with a forgetting factor applicable to minimum phase plants. The tracking and regulation objectives are independently specified. The relevance of the eigenvalues of the gain matrix (F_k) used in the updating equation for the adaptive parameters ($\text{}\text{?}\text{gq(k)}$) is shown. It is proved that if the maximum eigenvalue of the inverse of the gain matrix F_k has an upper bound and a non-zero lower bound then the global convergence of the control algorithm is insured. The result of the design is a simple control scheme using a linear constant feedforward controller and a nonlinear feedback controller. The performance of the control structure in tracking and regulation are evaluated by simulations.