双口内模在主汽温系统中的仿真应用

The simulation applications of dual-port IMC in main steam temperature system

电厂中,过热器出口蒸汽温度需要严格控制,蒸汽温度过高或过低都将对安全生产带来不利的影响,通常温度必须限定在±5℃的范围内。过热蒸汽温度控制的主要任务为保护过热器,维持其出口蒸汽温度在允许的范围内使管壁温度不超过允许的工作温度。主蒸汽温系统的控制对象具有的大时滞的特性,使得串级控制难以达到满意的效果,而且参数难以调节。本文在内模控制的基础上拓展,将双口内模控制应用到主汽温控制系统中并通过Simulink分别在内模控制器无限幅和有限幅的情况下进行仿真,其仿真结果与串级控制、IMC控制系统进行比较。仿真结果表明双口内模控制在限幅的前提下,具有较好与内模控制效果。

The outlet temperature of the steam superheater must be strictly controlled in Power Plant.The steam temperature is too high or too low will bring adverse effect on safety production, it must be limited in the range of：t：5 ℃. The main task of the superheated steam temperature control is to protect superheater and to maintain the tube temperature within the permissible range does not exceed the allowable operating temperature. Main Steam Temperature Control System object has a large delay characteristics, making Cascade control is difficult to achieve satisfactory results and is difficult to adjust parameters. Base on the internal model control, the dual-port internal model control is applied to the main steam temperature control system in this paper and through the Simulink model controller, respectively, of infinite and finite amplitude under the condition of simulation. The simulation results with cascade control, IMC control system for comparison. Simulation results show that the dual-port internal model control has good control effect when the output of the controller is limit.