基于串级PID的过热汽温多模型切换控制

Cascade PID Based Multi-model Switching Control for Superheated Steam Temperature

提出了一种易于工程实现的过热汽温先进控制策略。在常规串级PID控制的基础上,设计了多模型切换控制方案,有效避免了单一控制模式不能适应系统工况变化的问题,另外,主调PID控制器的参数通过内模原理整定,较好地保留了内模控制器的特点,能够有效克服过热汽温对象的大迟延特性。所设计的控制系统已经成功应用于某电厂300MW机组,从投运效果看,当机组负荷大范围变化时,过热汽温仍能维持在正常范围内,保证了机组的安全经济运行。

An advanced control strategy that can be realized easy in engineering is proposed. On the basis of conventional cascade PID control, the control scheme of multi-model switching which can adapt effectively the operating conditions varying is designed; moreover, the main PID controller parameters are regulated based on the principle of IMC （Internal Model Control）, which is effective to control the big-lagged process. The proposed control strategy has been successfully applied to a 300MW power unit; the running results＇show that the proposed control strategy can ensure the superheated steam temperature stay within the satisfactory range in varying load process.