基于扩展状态观测器的过热汽温控制

Extended Observer-based Superheated Steam Temperature Control

以火电厂过热蒸汽温度控制系统为背景,针对被控对象的大惯性、大迟延特性以及常规状态反馈控制不能消除稳态误差的问题,提出了带有误差积分反馈的观测器-状态反馈控制方案。针对被控对象阶次认知的不确定性,分别设计了不同阶次的状态观测器对系统的状态进行重构,进而构成状态反馈控制。仿真结果表明:过热汽温控制系统采用带有误差积分反馈的观测器-状态反馈控制策略时,具有较好的控制品质,且当观测器的阶次大于被控对象阶次时,控制效果要好于观测器的阶次小于被控对象阶次时;而观测器的阶次等于被控对象阶次时,控制效果是最好的。

In view of the fact that the superheated steam temperature control system in thermal power plant has characteristics of large inertia and large time-delay and the conventional state feedback control can＇ t eliminate the steady state error, state feedback control strategy with integral error feedback was proposed. Taking into account the cognitive uncertainty about the order of the object, state observers with different orders were designed to reconstruct the state of the system, which was used for state feedback control. The simulation studies show that： better control quality can be obtained when observer with error integral feedback-state feedback control strategy is applied to superheated steam temperature control system. And when the order of the observer is greater than the controlled object＇ s, the control effect is better than that when observer order is less than the controlled object＇ s ; what＇ s more, when the observer order is equal to the controlled object＇ s, the control effect is the best.