基于一种混沌BP算法的神经模糊控制器的优化

在模糊控制器设计问题的研究中,结合神经网络和模糊控制的优点,设计了一种全网络化的模糊控制器,使模糊推理的实现过程网络化,清晰化.针对BP算法学习速度慢、易陷入局部最小的缺点,引入混沌思维,提出了基于混沌Logistic方程的BP混合学习算法(CBP),将用于神经模糊控制器参数的优化设计中,使设计的神经模糊控制器具有更优的性能.通过仿真对算法及控制器进行验证,仿真结果表明,上述算法能有效地优化神经模糊控制器的参数和结构,所设计的神经模糊控制器具有较好的性能.     

基于改进粒子群算法的模糊神经网络PID控制器设计

针对模糊神经网络PID控制器中参数初始值的设置对控制器性能影响大的问题,提出一种改进的PSO算法优化模糊神经网络PID控制器参数的设计方法.该方法采用实数编码的方式对控制器参数进行优化,并以ITAT指标作为改进的PSO优化算法的适应度函数.实验仿真表明:经过改进的PSO算法优化的模糊神经网络PID控制器具有良好的动静态性能,响应速度更快,超调量更小,控制精度更高.     

利用T-S模糊自适应PSO算法优化PID参数

针对微粒群优化算法存在的早熟问题,提出了一种基于T-S模型的模糊自适应PSO算法（T-SPSO算法）。算法依据种群当前最优性能指标和惯性权重值所制定T-S规则,动态自适应惯性权重取值,改善了PSO算法的收敛性。将该算法应用于PID控制器的参数整定,可得到更优的控制器参数。仿真结果验证了所提出算法的有效性和所设计控制器的优越性。     

灰狼算法优化分数阶模糊控制器参数

PID模糊控制在工业控制中是最广泛的一种控制方法,在一些复杂的实际系统中,应用分数阶PID模糊控制器在整定系统参数性能上优于整数模糊控制器.分数阶模糊控制器具有较多的控制参数,这些控制参数直接影响了模糊控制器的性能.用传统的算法校准分数阶模糊控制器并不能得到最佳的参数值,而且标定参数的过程较为复杂.因此提出用灰狼优化算法(Grey Wolf Optimizer,GWO)优化分数阶模糊控制器的参数.将基于灰狼优化算法的分数阶模糊控制器优化方法与其他五种典型的基于群智能的优化方法进行了比较.实验结果表明,该方法的控制效果更好.     

一种新的模糊控制器的优化方法

通过分析对模糊控制器作优化的原理, 提出了一种新的优化设计方法. 用三个参数调整所定义的输入、输出语言变量的隶属函数, 通过单纯形法调整参数使性能指标最小, 从而使设计出的模糊控制器性能接近最优. 仿真结果表明, 本文的方法简单、有效, 对于模糊控制器的工程设计具有很大实用性.     

MIMO系统非线性模糊免疫PID的设计与优化

针对工业中常规控制器难以达到较好控制效果的控制难点,提出了免疫PID控制器,利用模糊控制可以无限逼近非线性的特性,构成非线性模糊免疫PID控制器,并基于正交函数将M1MO(多输入多输出)控制系统的非线性模糊免疫PID控制器的设计过程转化为由一个只含有代数方程的算法来实现,最后用具有自适应功能的遗传算法对其进行优化.仿真结果表明,所设计的控制器在控制性能上优于常规PID,并能快速得到最优参数.另方面对于多输入多输出控制系统,控制器的设计和优化显得更为简便和有效.     

基于PSO的模糊控制器参数优化设计

本文提出了将微粒群优化(PSO)算法应用于模糊控制器的参数优化设计中,针对常用的工业对象模型进行了仿真实验,仿真结果表明基于微粒群算法优化模糊控制器参数可以获得满意的控制效果,PSO算法为模糊控制器的设计提供了一种的新的思路.     

PSO算法在数控机床交流伺服系统PID参数优化中的应用

针对发展高精度数控机床的要求,在数控机床交流伺服控制系统中,本文提出了一种新的永磁同步电机控制策略,即利用粒子群算法对模糊控制器的三个比例因子参数Ka、Kb和Ku进行全局优化,充分发挥模糊控制器的鲁棒性.仿真结果表明,采用PSO算法进行PID参数优化的数控机床交流伺服系统的运动控制具有很强的鲁棒性和动态性能,是一种切实可行的控制方法.     

模块化反步自适应大机动飞行控制

针对飞机大机动飞行时模型非线性和参数不确定性的特点,提出一种输入状态稳定反步自适应控制的模块化设计方法.基于模块化设计思想,设计一个输入状态稳定的反步控制器,保证在输入有界情况下系统状态的有界特性.基于最小二乘算法设计参数自适应律和滤波器的辨识器模块,保证独立于输入状态稳定控制器之外的参数误差及其导数有界,并利用一种基于免疫克隆原理的改进粒了群算法优化固定参数,改善动态性能.仿真结果表明了所提出算法的有效性.     

一类Takagi-Sugeno模糊控制器的自适应遗传优化设计

提出了一类Takagi-Sugeno模糊控制器的自适应遗传优化设计方法。采用实数编码方式,并由自适应交叉和变异概率来控制遗传操作,有效地提高了参数优化的精度和算法的寻优效率。在优化过程中引入对称性参数约束条件,大大减小了算法的搜索空间。将该算法用于倒立摆T-S模糊控制器的设计,实现了控制器参数的快速自动整定。仿真结果表明,获得的T-S模糊控制器具有优良的性能。     

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.     

一种基于组合型模糊控制的主动队列管理算法

计算机网络具有的复杂性和动态特性使传统控制理论难以进行主动队列管理（Active Queue Management, AQM）算法的设计和分析．本文在模糊集合和模糊系统理论的基础上设计了一个主动队列管理算法CF（Combination Fuzzy control）．其中模糊控制器I根据瞬时队列的长度和变化值计算控制量；模糊控制器II根据系统负载因子计算控制增益．通过选择模糊控制器参数，模糊控制系统与使用PI（Proportional Integral）控制器的系统具有相同的局部稳定性．最后通过仿真对CF、PI和单模糊控制器的性能进行了比较．     

An intelligent coordinator design for GCSC and AGC in a two-area hybrid power system

This study addresses the design procedure of an optimized fuzzy fine-tuning (OFFT) approach as an intelligent coordinator for gate controlled series capacitors (GCSC) and automatic generation control (AGC) in hybrid multi-area power system. To do so, a detailed mathematical formulation for the participation of GCSC in tie-line power flow exchange is presented. The proposed OFFT approach is intended for valid adjustment of proportional–integral controller gains in GCSC structure and integral gain of secondary control loop in the AGC structure. Unlike the conventional classic controllers with constant gains that are generally designed for fixed operating conditions, the outlined approach demonstrates robust performance in load disturbances with adapting the gains of classic controllers. The parameters are adjusted in an online manner via the fuzzy logic method in which the sine cosine algorithm subjoined to optimize the fuzzy logic. To prove the scalability of the proposed approach, the design has also been implemented on a hybrid interconnected two-area power system with nonlinearity effect of governor dead band and generation rate constraint. Success of the proposed OFFT approach is established in three scenarios by comparing the dynamic performance of concerned power system with several optimization algorithms including artificial bee colony algorithm, genetic algorithm, improved particle swarm optimization algorithm, ant colony optimization algorithm and sine cosine algorithm.     

Robust fuzzy controller design of nonlinear dynamic systems based on H ∞ optimal criterion

A new design method of fuzzy controllers to achieve H X optimal performance for a class of uncertain nonlinear systems is presented. The dynamic behaviour of a product-sum-type fuzzy controller is analysed and the result reveals that this type of fuzzy controller behaves approximately like a state feedback controller with non-constant feedback gains which are dependent on input signals. Based on the H X control design technique, a systematic analysis and design of the fuzzy controller is presented for guaranteeing the stability or even the performance. Even though the bound of the plant nonlinearity is unknown, the influence of the nonlinear term on the system error is attenuated to a prescribed level by the proposed fuzzy controller. Finally, the fuzzy controller is applied to the Duffing forced oscillation system, which confirms the validity of the controller.     

基于感知模糊自适应蚁群算法的非线性PID控制

随着系统复杂度的提高和对象不确定性因素的增加,为克服线性PID动态性能和稳态性能差的缺陷,分析了非线性PID控制器各控制参数对误差的理想变化过程,构造非线性PID控制器。由于增益参数大量增加,传统参数优化方法不再适用,在分析蚁群算法的基础上,提出了基于感知自适应蚁群算法,并加入模糊自适应信息素更新机制,用于优化非线性PID控制器的设计方法。通过仿真实验将该控制器与基于蚁群算法的非线性PID控制器和基于蚁群算法、Z-N法的PID控制器进行对比,并对控制性能和收敛性能进行了分析,结果表明该算法有效克服了传统蚁群算法收敛速度较慢、容易陷入局部最优而停滞的缺陷,该控制器具有更好的动态性能和稳态性能。     

基于强化学习的参数自整定及优化算法

传统PID控制算法在非线性时滞系统的应用中,存在参数整定及性能优化过程繁琐、控制效果不理想的问题。针对该问题,提出了一种基于强化学习的控制器参数自整定及优化算法。该算法引入系统动态性能指标计算奖励函数,通过学习周期性阶跃响应的经验数据,无需辨识被控对象模型的具体数据,即可实现控制器参数的在线自整定及优化。以水箱液位控制系统为实验对象,对不同类型的PID控制器使用该算法进行参数整定及优化的对比实验。实验结果表明,相比于传统的参数整定方法,所提出的算法能省去繁琐的人工调参过程,有效优化控制器参数,减少被控量的超调量,提升控制器动态响应性能。     

Teaching–learning based optimization algorithm based fuzzy-PID controller for automatic generation control of multi-area power system

This paper deals with the design of a novel fuzzy proportional–integral–derivative (PID) controller for automatic generation control (AGC) of a two unequal area interconnected thermal system. For the first time teaching–learning based optimization (TLBO) algorithm is applied in this area to obtain the parameters of the proposed fuzzy-PID controller. The design problem is formulated as an optimization problem and TLBO is employed to optimize the parameters of the fuzzy-PID controller. The superiority of proposed approach is demonstrated by comparing the results with some of the recently published approaches such as Lozi map based chaotic optimization algorithm (LCOA), genetic algorithm (GA), pattern search (PS) and simulated algorithm (SA) based PID controller for the same system under study employing the same objective function. It is observed that TLBO optimized fuzzy-PID controller gives better dynamic performance in terms of settling time, overshoot and undershoot in frequency and tie-line power deviation as compared to LCOA, GA, PS and SA based PID controllers. Further, robustness of the system is studied by varying all the system parameters from −50% to +50% in step of 25%. Analysis also reveals that TLBO optimized fuzzy-PID controller gains are quite robust and need not be reset for wide variation in system parameters.     

典型模糊控制器的解析表达式及其系统化设计方法

对两输入一输出的典型模糊控制器推导了其解析表达式,并对输入变量各取５个模糊子集的情况进行分析,提出一种设计模糊控制器的系统化方法,它能保证模糊控制器的性能在工作眯附近等效于ＰＩ控制器,而在远离工作点时明显优于ＰＩ控制器。仿真实验结果验证了该方法的有效性。     

船舶航向操纵参数自整定模糊控制仿真

船舶航向操纵模糊控制是船舶航行的自动化的一项新的控制技术，船舶在海上航行，由于受到浪水流和气象等环境影响，受到的干扰相当复杂，船舶运动的数学模型在不同海域海情和吃水不同时，模型参数变化是时变的，非线性的，常规的ＰＩＤ自动舵不能好保持航向，模糊控制是基于熟练舵工的操舵经验，总结成语言表达的控制规则，根据模糊集合理论，利用航向偏差，航向变化率主输入量，应用模糊控制理论，确定舵角控制量，实现航向保持，它     

具有参数在线修正机构的模糊控制器

本文分析了模糊控制器三个参数对系统动态及稳态性能的影响，提出了一种新的模糊控制器参数在线修正算法，通过仿真实验效果良好，改善了模糊控制的性能，因而可扩大应用范围，更有实用价值。