一种基于对象特征的自适应模糊控制

提出了一种基于对象特征的自适应模糊控制.模糊控制器在线判断对象特征,预 测控制过程所需能量;据此在线动态变动模糊集合的划分,适应不同对象的控制.控制系统动 态品质和稳定性分别在阶跃响应上升阶段和稳态调整阶段实现,兼顾两方面的要求.给出了 模糊控制系统稳定的一个充分条件.该条件通过调整控制量的模糊划分实现.     

一种通用模糊控制器的研究与设计

设计了一种通用模糊控制器，可适用于不同控制对象。采用软件的方法在线调整量化因子及比例因子，并在控制过程中对规则自动调整和完善，从而使控制规则趋于最优。仿真结果表明，这种通用模糊控制器的控制性能优于普通的模糊控制器，达到较高的控制精度。     

一种在线变动模糊划分的自适应模糊控制方法

本文提出了一种在线变动模糊划分的自适应模糊控制方法。该方法在控制中基于二阶模型在线判断被控对象的特征，据此在线调整模糊控制中模糊集合的划分。模糊集合划分的在线变动与模糊控制规则共同实现控制策略，能适应对控对象的较大变化。文中给出了多种工况控制实例。     

一种新型自寻优模糊控制器

利用梯度下降法反向修改带有可调整因子的模糊控制器中的可调整因子。提出了一种对可调整因子进行在线实时修改和优化的方法。通过对被控对象的分析给出了控制器参数的初值。在运行过程中，利用该方法对可调整因子进行在线实时修改和优化，实现模糊控制器控制规则的自寻优，使过程具有较好的控制品质。     

一种自组织模糊神经网络控制器

采用一种具有结构和参数学习能力的自组织模糊神经网络控制器设计方法。这种控制器无需事先确定模糊控制规则，能在控制过程中通过神经网络的结构及参数学习在线调整模糊神经网络的结构、产生模糊控制规则、调整规则的参数。仿真表明该控制器能用于一定纯滞后时变对象的控制，具有良好的控制性能。     

基于模糊模型的低阶系统自适应控制

本文提出了基于模糊模型的自适应控制，自适应性是通过对模糊过程模型的在线辨识而取得的。从粗糙的良初模型开始，自适应控制将模型调整到与过程相符合，以便自校正控制器。     

模糊神经网络PID控制器及在DTC中的应用

本文详细介绍了常规控制和模糊PID控制在直接转矩控制系统中的应用，建立在MATLAB仿真模型的基础上．利用多层神经网络构建模糊PID控制器，通过神经网络自学习能力在线提取模糊控制规则，根据不同时刻的误差和误差变化率运用模糊推理在线自整定PID参数。仿真表明，改进的模糊PID控制器具有常规PID控制器更好的效果。本系统适用于高性能交流伺服或调速系统。     

一种新型智能模糊控制器的研究

从模糊控制器量化因子入手，对其进行了深入的分析，提出了一种智能型的模糊控制器结构。其中，智能调节器使量化因子随控制不同阶段而动态变化。文中对智能调节器的设计过程作了介绍，并对两个被控对象分别用基本模糊控制器和基于智能调节器的模糊控制器的控制效果进行了分析比较。仿真例子证明了智能模糊控制器的有效性。     

基于模糊推理的自整定PID控制器

设计了一种新的模糊PID控制器，用基于给定的相角裕度和幅值裕度的方法给出了PID控制器参数的初值，在运行过程中，用模糊控制器在线调整PID参数，使过程具有较高的控制品质。     

基于控制器输出误差方法的自适应模糊控制及其在机器人轨迹跟踪控制中的应用

本文提出一种自适应模糊控制器并将之用于机器人轨迹跟踪控制 ,该控制器采用控制器输出误差方法 (COEM) ,根据控制器的输出误差而不是对象的输出误差来在线地调整模糊控制器的参数 ,无须对对象进行辩识 .仿真结果表明该控制器用于机器人轨迹跟踪控制具有很好的性能 ,是一种有效的控制器     

An advanced FMRL controller for FACTS devices to enhance dynamic performance of power systems

The parameters of power system slowly change with time due to environmental effects or may change rapidly due to faults. It is preferable that the control technique in this system possesses robustness for various fault conditions and disturbances. The used flexible alternating current transmission system (FACTS) in this paper is an advanced super-conducting magnetic energy storage (ASMES). Many control techniques that use ASMES to improve power system stability have been proposed. While fuzzy controller has proven its value in some applications, the researches applying fuzzy controller with ASMES have been actively reported. However, it is sometimes very difficult to specify the rule base for some plants, when the parameters change. To solve this problem, a fuzzy model reference learning controller (FMRLC) is proposed in this paper, which investigates multi-input multi-output FMRLC for time-variant nonlinear system. This control method provides the motivation for adaptive fuzzy control, where the focus is on the automatic online synthesis and tuning of fuzzy controller parameters (i.e., using online data to continually learn the fuzzy controller that will ensure that the performance objectives are met). Simulation results show that the proposed robust controller is able to work with nonlinear and nonstationary power system (i.e., single machine-infinite bus (SMIB) system), under various fault conditions and disturbances.     

Structural analysis of fuzzy controllers with nonlinear input fuzzy sets in relation to nonlinear PID control with variable gains

The popular linear PID controller is mostly effective for linear or nearly linear control problems. Nonlinear PID controllers, however, are needed in order to satisfactorily control (highly) nonlinear plants, time-varying plants, or plants with significant time delay. This paper extends our previous papers in which we show rigorously that some fuzzy controllers are actually nonlinear PI, PD, and PID controllers with variable gains that can outperform their linear counterparts. In the present paper, we study the analytical structure of an important class of two- and three-dimensional fuzzy controllers. We link the entire class, as opposed to one controller at a time, to nonlinear PI, PD, and PID controllers with variable gains by establishing the conditions for the former to structurally become the latter. Unlike the results in the literature, which are exclusively for the fuzzy controllers using linear fuzzy sets for the input variables, this class of fuzzy controllers employs nonlinear input fuzzy sets of arbitrary types. Our structural results are thus more general and contain the existing ones as special cases. Two concrete examples are provided to illustrate the usefulness of the new results.     

模糊滑动模态控制系统的性质分析

根据滑动模态原理,将模糊控制系统的输入量简化为广义跟踪误差的一个超平面,并基于三角形的非线性发语言变量的隶属度,分析了模糊控制系统的某些性质,表明在系统稳定性、稳态误差等指标方面,模糊控制器优于一般的ＰＩＤ控制器。     

抄纸过程水分定量的改进型模糊免疫PID控制

针对抄纸过程中的水分定量控制对象是一个具有强耦合、非线性、大时滞的难控制对象,提出一种改进型模糊免疫PID控制方法,这种方法用三输出的模糊控制和免疫PID控制相结合的方法,避免了常规模糊免疫控制器只相当于一个非线性P控制器的缺点,能充分发挥PID三个参数的自适应性能;最后将这种方法对抄纸过程的水分定量控制进行了仿真研究,结果表明,该方法比传统模糊免疫PID有更好的自适应性,具有超调小、响应快等优点,对多变量耦合系统具有较强的自适应性、解耦和鲁棒性。     

模糊控制在退火炉燃烧过程控制中的应用

燃油退火炉控制的困难在于过程中参数的多变性,非线性,噪声,不对称的增益特性,以及 较大的纯滞后.本文介绍了模糊控制在退火炉燃烧过程中的应用.在炉温和炉压控制回路 中,采用了经过改进的模糊控制器,得到了较快的响应特性和较精确的温度、压力控制效果. 作者还应用模糊集理论设计了一种模糊自寻优控制器,对油/风比进行控制.运行结果表明, 模糊控制能克服退火炉燃烧过程控制中的上述困难,具有较强的鲁棒性,获得了满意的控制效 果.     

在线自调整高压差模糊控制系统研究

针对羰基合成反应中气液分离器压力难以实现自动控制的问题,提出了一种基于模糊控制思想,构成参数在线自调整智能控制系统的设计方法。将该系统应用于气液分离器压力控制中,鲁棒性较好,满足了生产工艺对压力的控制要求。     

一种等价于PI的二型模糊控制器设计算法

区间二型模糊集合将次隶属度做了简化,基于KM降阶算法的区间二型模糊控制器实现起来相对简单.虽然区间二型模糊控制器在一定程度上优于传统的一型模糊控制器或者PI控制器等,但区间二型模糊控制器并没有充分利用二型模糊集合的次隶属度信息.为解决这些问题,研究了普通二型模糊控制器的一般结构,提出了一种等价于PI的二型模糊控制器.该...     

Adaptive hierarchical tuning of fuzzy controllers

Fuzzy controller design includes both linear and non-linear dynamic analysis. The knowledge base parameters associated within the fuzzy rule base influence the non-linear control dynamics while the linear parameters associated within the fuzzy output signal influence the overall control dynamics. For distinct identification of tuning levels, an equivalent linear controller output and a normalized non-linear controller output are defined. A linear proportional-integral-derivative (PID) controller analogy is used for determining the linear tuning parameters. Non-linear tuning is derived from the locally defined control properties in the non-linear fuzzy output. The non-linearity in the fuzzy output is then represented in a graphical form for achieving the necessary non-linear tuning. Three different tuning strategies are evaluated. The first strategy uses a genetic algorithm to simultaneously tune both linear and non-linear parameters. In the second strategy the non-linear parameters are initially selected on the basis of some desired non-linear control characteristics and the linear tuning is then performed using a trial and error approach. In the third method the linear tuning is initially performed off-line using an existing linear PID law and an adaptive non-linear tuning is then performed online in a hierarchical fashion. The control performance of each design is compared against its corresponding linear PID system. The controllers based on the first two design methods show superior performance when they are implemented on the estimated process system. However, in the presence of process uncertainties and external disturbances these controllers fail to perform any better than linear controllers. In the hierarchical control architecture, the non-linear fuzzy control method adapts to process uncertainties and disturbances to produce superior performance.     

Adaptive fuzzy identification and predictive control for industrial processes

This paper proposes a method for adaptive identification and control for industrial applications. The learning of a T–S fuzzy model is performed from input/output data to approximate unknown nonlinear processes by a hierarchical genetic algorithm (HGA). The HGA approach is composed by five hierarchical levels where the following parameters of the T–S fuzzy system are learned: input variables and their respective time delays, antecedent fuzzy sets, consequent parameters, and fuzzy rules. In order to reduce the computational cost and increase the algorithm’s performance an initialization method is applied on HGA. To deal with nonlinear plants and time-varying processes, the T–S fuzzy model is adapted online to maintain the quality of the identification/control. The identification methodology is proposed for two application problems: (1) the design of data-driven soft sensors, and (2) the learning of a model for the Generalized predictive control (GPC) algorithm. The integration of the proposed adaptive identification method with the GPC results in an effective adaptive predictive fuzzy control methodology. To validate and demonstrate the performance and effectiveness of the proposed methodologies, they are applied on identification of a model for the estimation of the flour concentration in the effluent of a real-world wastewater treatment system; and on control of a simulated continuous stirred tank reactor (CSTR) and on a real experimental setup composed of two coupled DC motors. The results are presented, showing that the developed evolving T–S fuzzy model can identify the nonlinear systems satisfactorily and it can be used successfully as a prediction model of the process for the GPC controller.