125S2274-2RIS1046-856

125S2274-2RIS1046-856

125S2274-2RIS1046-856

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福州卓凯电子科技有限公司

联系人： 王工（ 销售工程师 ）
传真（Fax）：0591-62182535

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生物质气化过程是一项复杂化学反应过程，具有非线性、不稳定性、负荷干扰等特性，只有实行智能控制才能受到良好的控制效果。模糊神经网络作为智能 研究比较活跃的领域，有效融合了神经网络和模糊理论的优点，能够有效的解决生物质气化过程中的非线性、模糊性等问题，既保证控制的精确度，又能进行快速地 升降温。本文通过对模糊神经网络的内涵特征进行全面分析，阐述了基于模糊神经网络的生物质气化炉的智能控制，并通过仿真实验进行反复验证。

一、模糊神经网络的内涵功能

简而言之模糊神经网络就是具有模糊权值和输入信号的神经网络。模糊神经网络是自动化控制领域内一门新兴技术，其本质上是将常规的神经网络输入模糊信 号，因而模糊神经网络具备了模糊系统和神经网络的优势，集逻辑推理、语言计算等能力于一身，具有学习、联想、模糊信息处理等功能。模糊神经网络是智能控制 和自动化不断发展的产物，在充分利用神经网络的并行处理能力的基础上，大大提高了模糊系统的推理能力。

模糊神经网络是科技发展的产物，有效吸收了神经网络系统和模糊系统的优点，在智能控制和自动化发展等方面有着重要的作用，能够有效地处理非线性、模糊 性等诸多问题，在处理智能信息方面能够发挥巨大潜力。模糊神经网络形式多种多样，主要包括逻辑模糊神经网络、算术模糊神经网络、混合模糊神经网络等多种类 型，被广泛的运用于模糊回归、模糊控制器、模糊谱系分析、通用逼近器等方面的研究中，随着智能控制和自动化领域的不断发展，模糊神经网络广泛应用于智能控 制领域。

二、基于模糊神经网络的生物质气化炉的智能控制系统

2.1 温度智能控制系统

生物质热值、给料理以及一次风量等因素变化能够影响到生物质气化炉的炉温，但是最重要的影响因素是在气化炉工作过程中物料物理和化学反应的放热和吸 热。由于生物质气化工作过程中的生物质热值的变化范围较小，在实际运行中很难测量与控制，有时可以忽略不计，同时，该工作过程中存在非线性和大滞后等问 题，采用传统的数学模型达不到预期测量效果，因此需要利用模糊神经网络设计气化炉炉温控制系统，不断的提高温度的控制效果。模糊神经网络首先根据当前温度 以及设定温度设，主控制器对最优的生物质物料添加量进行预测，然后由副控制根据该添加量，全面跟踪控制送料速度，从而能够进行精确上料和控制炉温。模糊神 经网络系统十分庞大复，其中包含了大量错综复杂的神经元，蕴含对非线性的可微分函数训练权值的基本理念。模糊神经网络具有正向传递和反向传播两个不同的功 能，在信息的正向传递中，采用逐步运算的方式对输入的数据信息进行处理，信息依次进入输入层、隐含层最终到达输出层。假如在输出层获得的输出信息没达到预 期效果时，就会在计算输出层的偏差变化值后通过网络将偏差信号按原路反向传回，与此同时各层神经元的权值也会随之进行改变，直到符合预期的控制效果。

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