基于IMC的锅炉汽包水位控制系统仿真研究  

Internal model control based simulation of boiler drum water level control system

作　　者：张哲[1] 左为恒[1] 左培新 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]重庆大学电气工程学院,重庆400030

出　　处：《热力发电》2013年第8期59-62,68,共5页Thermal Power Generation

摘　　要：分析了锅炉汽包水位变化的特点和内模控制(IMC)的特点,提出了基于IMC的汽包水位三冲量串级控制系统。该控制系统将蒸汽流量作为前馈信号,内环采用PID控制器,以克服给水流量、给水压力对汽包水位控制的干扰;外环采用IMC控制器,以克服蒸汽流量的干扰,并维持汽包水位恒定。将基于IMC汽包水位控制系统仿真结果与PID-PID汽包水位控制系统进行了对比,结果表明基于IMC汽包水位控制策略较PID-PID汽包水位控制策略响应更快速,稳态性能更好,具有良好的鲁棒性和抗干扰能力,同时验证了基于IMC的汽包水位三冲量串级控制系统的有效性。On the basis of analyzing the features of boiler drum water level variation and the internal model control(IMC),an IMC-based three-impulse cascade control system for water level in boiler drum was proposed.This system regards steam flow rate as the feed-forward signal.In order to overcome the interference of water pressure and flow,the PID controller was adopted in the inner loop.The IMC was adopted in the outer loop to overcome the interference of steam flow rate and keep the water level constant.Results simulated by the IMC-based boiler drum water level control system were compared with that by the PID-PID boiler drum water level control system.The results indicated that,the IMC control system can response more rapidly,and had better steady state performance,stronger robustness and higher anti-interference ability.Furthermore,the effectiveness of the IMC-based three-impulse cascade control system for boiler drum water level control was verified.

关 键 词：锅炉汽包水位 三冲量 内模控制 串级前馈 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]