基于串级PID的过热汽温多模型切换控制

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。

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

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.