摘要
过热汽温系统是典型的大时延、大惯性对象,尤其当机组负荷变化时,参数表现出明显的时变特性,大大降低了传统PID串级控制的品质。基于此点,提出先进的多模型切换的过热汽温预测函数控制策略。使用带有Smith预估补偿思想的一阶时滞对象预测函数控制算法,来有效克服对象的大时延、大惯性;并通过建立若干典型工况的固定模型,在线计算其模型匹配度确定控制权重,从而得到控制器的输出的方法,能适应参数的时变。与PID串级控制和单一模型控制的仿真结果对比,证实了本控制策略的有效性。
The superheated steam temperature system is a typical element with large time lag and outstanding inertial behavior. Especially in case of load changes, the parameters show obvious time-dependence property, which markedly reduces the quality of the traditional PID cascade control. An advanced muhi-model switching control strategy using predictive functions is therefore being presented. Control algorithm as conceived by Smith with predictive functions for compensating first order delay is used to effectively overcome the large time lag and big inertia of the study object. The output of the controller is made to be attempered to the time changing property of the parameters by setting up several fixed models for the typical operating conditions and their control weightiness determined by online calculating their degree of mutual matching. The effectiveness of this control strategy is being confirmed by a comparison with simulation results of PID cascade control and single model control. Figs 3, table 1 and refs 8.
出处
《动力工程》
EI
CSCD
北大核心
2005年第4期537-540,共4页
Power Engineering
基金
华北电力大学(北京)青年博士学位基金项目资助
关键词
自动控制技术
预测函数控制
多模型
过热汽温
automatic control technology
predictive functional control
muhi-model
superheated steam temperature.
