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电站SCR脱硝系统被控对象具有大惯性、大迟延特性,且对象参数随负荷变化很大,传统PID不仅控制效果差,更难以在变工况状态下进行有效的控制。为此,针对某电厂600MW机组的脱硝系统,在3个典型负荷工况下进行了喷氨量扰动试验,对每个典型工况设计了具有预估控制功能的二自由度模型驱动PID(MD-TDOF-PID)控制器作为局部控制器,并通过多模型自适应控制策略,实现大范围负荷工况下氮氧化物(NOx)含量的控制。从系统仿真结果来看,无论是稳态还是变负荷工况,所提出的控制方案对SCR出口NOx都可进行有效控制。
The SCR controlled denitrification system in power station has the characteristics of large inertia and large delay, and the parameters of the object vary greatly with the load. The traditional PID not only has poor control effect but also is more difficult to control effectively under changing working conditions. Therefore, aiming at the denitrification system of a 600 MW unit in a power plant, the ammonia injection disturbance test was carried out under three typical load conditions. For each typical working condition, a two-degree-of-freedom model-driven PID -TDOF-PID) controller as a local controller, and through a multi-model adaptive control strategy to achieve nitrogen oxide (NOx) control over a wide range of load conditions. From the system simulation results, whether the steady-state or variable load conditions, the proposed control scheme for SCR NOx emissions can be effectively controlled.