过热气温的多内模自适应内模控制的研究

针对电厂过热汽温被控对象具有大惯性、大滞后特性且对象参数随负荷变化较大等因
素，提出了一种基于多模型的自适应内模控制策略。通过在不同工况辨识得到其多模型，设计出相应的内模控制器，根据运行工况选择相应的控制器，从而实现全工况运行的自适应；同时以火电厂过热汽温被控对象为参考模型设计自适应控制律，使控制器内部模型的参数逐步逼近被控对象的参数直至相等。仿真结果表明，该控制策略比常规的内模控制具有更好的控制品质。
关键词：自适应；多内模；内模控制；过热汽温
abstract: According to the performance of superheated steam temperature, the adaptive internal model control (IMC) method based on multiple models is suggested. The multiple models are obtained by the weighted-sum. Their corresponding internal controllers are designed. By choosing an appropriate controller according to the operating conditions, the self- adaptive control of the total operating conditions is realized.And this paper takes the main steam temperature controlled process as the reference model to get the rule of adaptive control in order to make the parameters of nominal model approach the parameters of the controlled object and gradually equal it.. The simulation results show that the method is effective.
Key words: Adaptive；Multiple Models; Internal Model Control; Superheated Steam Temperature