基于间接能量平衡的锅炉汽温GPC—PID串级控制

针对电站锅炉汽温对象由于存在大惯性、大时滞、非线性和难以建立精确模型,使得传统串级PID控制算法在满足AGC负荷响应快速性和准确性方面存在较大不足等问题,基于直接能量平衡思想,提出一种间接能量平衡法(IEBM)。通过IEBM构造并预测整定出反映变负荷工况的导前汽温设定值,把原串级控制系统中副控制器的随动控制功能改变为定值控制,从而达到间接控制锅炉主汽温和再热汽温的目的。由于系统能及时“预测”到汽温迟延受不同负荷的影响,导前汽温成为控制的主体,采用广义预测控制策略(GPC),而主回路仍然采用PID控制器,构成新型基于多模型RBF神经网络离线辨识的IEBM—GPC-PID串级控制系统。经现场实测数...

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Bibliographic Details
Published in电机与控制学报 Vol. 20; no. 9; pp. 9 - 16
Main Author 王爽心 贺飞 刘如九 马海林
Format Journal Article
LanguageChinese
Published 北京交通大学机械与电子控制工程学院,北京,100044 2016
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Summary:针对电站锅炉汽温对象由于存在大惯性、大时滞、非线性和难以建立精确模型,使得传统串级PID控制算法在满足AGC负荷响应快速性和准确性方面存在较大不足等问题,基于直接能量平衡思想,提出一种间接能量平衡法(IEBM)。通过IEBM构造并预测整定出反映变负荷工况的导前汽温设定值,把原串级控制系统中副控制器的随动控制功能改变为定值控制,从而达到间接控制锅炉主汽温和再热汽温的目的。由于系统能及时“预测”到汽温迟延受不同负荷的影响,导前汽温成为控制的主体,采用广义预测控制策略(GPC),而主回路仍然采用PID控制器,构成新型基于多模型RBF神经网络离线辨识的IEBM—GPC-PID串级控制系统。经现场实测数据仿真结果表明,提出的方法能够明显地提升汽温的控制效果,改善控制系统的鲁棒性。
Bibliography:power station boilers ; steam temperature ; indirect energy balance method ; cascade control ;generalized predictive control
WANG Shuang-xin, HE Fei, LIU Ru-jiu, MA Hai-lin ( School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)
Due to steam temperature characteristics of great inertia, pure time-delay, non-linear and diffi- cult to establish accurate models at power station, the conventional cascade PID controller is faced with significant shortcomings with its rapidity and accuracy of AGC' s ( Automatic generation control) load response. Based on the fundamental idea of direct energy balance ( DEB), an indirect energy balance method (IEBM) was proposed which can construct and predict the setting values of intermediate steam temperature that varies with the load' s command. It changed the inner controller in cascade system from original servo system into a constant value system so as to indirectly achieve the control of superheated and reheated steam temp
ISSN:1007-449X
DOI:10.15938/j.emc.2016.09.002