共查询到18条相似文献,搜索用时 125 毫秒
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采用模糊小波基函数神经网络的控制系统及混合优化算法 总被引:3,自引:1,他引:3
提出了一种采用模糊小波基函数神经网络的控制器,该控制器采用小波基函数作为模糊隶属函数,利用神经网络实现模糊推理,并可对隶属函数进行实时调整,从而使控制器具备更强的学习和自适应能力.还提出了控制器参数的混合学习算法,即先采用混沌算法离线优化,再采用BP梯度算法在线调整.对锅炉主蒸汽温度控制的仿真结果表明了此法的可行性和有效性.图3参6 相似文献
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B样条基函数模糊神经网络控制系统及其混合学习算法 总被引:2,自引:1,他引:2
介绍了一种基于模糊B样条基函数神经网络的控制器,该控制器将模糊控制的定性知识表达能力、神经网络的定量学习能力和B样条基函数优异的局部控制性能相结合,采用B样条基函数作为模糊隶属函数。还提出了模糊神经网络控制器的混合学习算法,即先采用免疫遗传算法离线优化,再采用BP梯度算法在线调整。对锅炉主蒸汽温度控制的仿真结果表明了此法的可行性和有效性。图4参3 相似文献
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介绍了一种基于模糊B样条基函数神经网络的控制器,该控制器将模糊控制的定性知识表达能力、神经网络的定量学习能力和B样条基函数优异的局部控制性能相结合,采用B样条基函数作为模糊隶属函数。还提出了模糊神经网络控制器的混合学习算法,即先采用免疫遗传算法离线优化,再采用BP梯度算法在线调整。对锅炉主蒸汽温度控制的仿真结果表明了此法的可行性和有效性。 相似文献
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从质子交换膜燃料电池(PEMFC)实际应用的角度出发,采用Elman动态神经网络对PEMFC系统进行建模,以实验中采样到的PEMFC系统的工作温度输入输出数据训练网络,并采用动态反向传播学习算法根据误差不断调整网络参数直至达到要求精度。设计了一种适应模糊神经网络控制器,根据经验确定了初始隶属度函数和模糊规则,并采用自适应学习算法不断调整隶属度函数与模糊规则参数,使控制系统获得理想的输出。仿真实验以Elman神经网络模型为参考模型,使用自适应神经网络控制算法取得了较好的控制效果。总之,所设计的控制系统适合于控制PEMFC这样一类复杂非线性系统。 相似文献
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风力发电机组参数的时变性、非线性,输入风速的随机性,造成输出电能质量较差.为改善系统输出功率的动态性能和稳态性能,运用自整定模糊控制器与二元函数的分片双二次Lagrange插值算法相结合的控制算法,并详细分析了该算法实现过程的时效性和控制性能.自整定用指数形式的修正函数来表示,根据控制对象的具体情况和要求,用计算机键盘对该函数中的参数进行调试,参数确定后形成以偏差为自变量的修正函数.运用SIMULINK的仿真结果表明,自整定模糊控制器和Lagrange插值法相结合的控制算法在风力发电机组中的应用,显著地改善了系统的控制品质和稳态性能. 相似文献
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Hong-Chan Chang Mang-Hui Wang 《Energy Conversion, IEEE Transaction on》1995,10(2):339-347
An efficient self-organizing neural fuzzy controller (SONFC) is designed to improve the transient stability of multimachine power systems. First, an artificial neural network (ANN)-based model is introduced for fuzzy logic control. The characteristic rules and their membership functions of fuzzy systems are represented as the processing nodes in the ANN model. With the excellent learning capability inherent in the ANN, the traditional heuristic fuzzy control rules and input/output fuzzy membership functions can be optimally tuned from training examples by the backpropagation learning algorithm. Considerable rule-matching times of the inference engine in the traditional fuzzy system can be saved. To illustrate the performance and usefulness of the SONFC, comparative studies with a bang-bang controller are performed on the 34-generator Taipower system with rather encouraging results 相似文献
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I-Hsum Li Wei-Yen Wang Shun-Feng Su Yuang-Shung Lee 《Energy Conversion, IEEE Transaction on》2007,22(3):697-708
To solve learning problems with vast number of inputs, this paper proposes a novel learning structure merging a number of small fuzzy neural networks (FNNs) into a hierarchical learning structure called a merged-FNN. In this paper, the merged-FNN is proved to be a universal approximator. This computing approach uses a fusion of FNNs using B-spline membership functions (BMFs) with a reduced-form genetic algorithm (RGA). RGA is employed to tune all free parameters of the merged-FNN, including both the control points of the BMFs and the weights of the small FNNs. The merged-FNN can approximate a continuous nonlinear function to any desired degree of accuracy. For a practical application, a battery state-of-charge (BSOC) estimator, which is a twelve input, one output system, in a lithium-ion battery string is proposed to verify the effectiveness of the merged-FNN. From experimental results, the learning ability of the newly proposed merged-FNN with RGA is superior to that of the traditional neural networks with back-propagation learning. 相似文献
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基于BP神经网络的温度控制系统 总被引:2,自引:0,他引:2
文中介绍了基于BP(Back Pmpagation)的神经网络气化炉温度控制系统。对BP神经网络控制算法作了详细的介绍,运用模糊逻辑控制概念赋予隐层含义,并决定其节点数,同时用高斯核函数作为节点激励函数,并做了仿真研究,叙述了系统的硬件与软件构成,试验表明所设计的系统操作方便、安全可靠,所选择的控制算法适应性强,控制效果良好。 相似文献
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应用神经网络模糊控制器的发动机怠速控制 总被引:12,自引:0,他引:12
应用模糊控制理论设计了一个用于发动机怠速控制的模糊控制器,并用BP人工神经网络实现这种模糊控制器输入输出的映射关系,在神经网络训练中采用了先进、有效的变尺度学习算法。最后给出了控制仿真结果。 相似文献
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In this paper an interval type-2 fuzzy logic controller (IT2FLC) was proposed for thyristor controlled series capacitor (TCSC) to improve power system damping. For controller design, memberships of system variables were represented using interval type-2 fuzzy sets. The three-dimensional membership function of type-2 fuzzy sets provided additional degree of freedom that made it possible to directly model and handle uncertainties. Simulations conducted on a single machine infinite bus (SMIB) power system showed that the proposed controller was more effective than particle swarm optimization (PSO) tuned and type-1 fuzzy logic (T1FL) based damping controllers. Robust performance of the proposed controller was also validated at different operating conditions, various disturbances and parameter variation of the transmission line parameters. 相似文献
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为提高基于模糊神经网络的锅炉炉膛受热面结渣预测精度,提出了一种基于广义钟型隶属度函数非线性惯性权重递减调整策略的粒子群优化算法,通过适应度测试函数对比实验、结渣预测实验和预测稳定性分析对现有文献中线性惯性权重递减调整策略(LPSO)、指数型非线性惯性权重递减调整策略(IPSO)和基于广义钟型隶属度函数非线性惯性权重递减调整策略(GJPSO)进行对比分析。研究结果表明:本文所改进的粒子群算法可以有效地改善算法的早熟现象、平衡算法的全局和局部搜索能力、提高算法的收敛效果和稳定性。利用改进后的粒子群算法对模糊神经网络中的权值和阈值进行优化,提高了模糊神经网络的炉膛结渣预测性能。 相似文献