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基于逆向传递策略的直流锅炉主汽温网络化预测控制

DOI: 10.13334/j.0258-8013.pcsee.2015.19.016, PP. 4981-4990

Keywords: 直流锅炉,主汽温度,网络化预测控制,带遗忘因子的递推最小二乘法,在线辨识,逆向传递策略,约束条件

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Abstract:

针对直流锅炉主蒸汽温度控制系统复杂,控制链跨度大的问题,在分析了主汽温控制系统特点的基础上,提出一种基于逆向传递策略的串级系统网络化预测控制方法,并采用遗忘因子递推最小二乘法(RLS)对子系统进行在线辨识,适应直流锅炉变工况需要。为了使喷水减温具有较大的调整范围,通过主汽温导前区在线辨识结果实现对逆向传递策略中设定值的设计;并用预测控制的约束条件,保证中间点温度和各级过热器出口具有足够的过热度。将该方法应用于电厂过热汽温控制系统进行仿真研究,结果表明该方法能较好地适应对象特性的变化,且控制效果明显优于常规串级控制系统。

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