Research on Denitrification Control Method Based on Two-degree-of-freedom Smith Predictive Compensation Strategy
To solve the problem of large delay and large inertia of denitrification system of thermal power units,and the compromise of tra-ditional Smith predictive compensate control between the anti-disturbance and setpoint tracking performance,a two-degree-of-freedom Smith predic-tive compensation control strategy was introduced to design the control system for denitrification of thermal power units,realizing the decoupling of setpoint tracking performance and anti-disturbance performance.By simulation research,the results illustrate that compared with the traditional de-nitrification cascade control and the traditional Smith predictive compensation control,the proposed method can reduce the adjustment time by 36%compared with the traditional denitrification cascade control,reduce the maximum dynamic deviation after disturbance by 52%,and the adjustment speed is 3～4 times faster,with better setpoint tracking and anti-interference ability.The algorithm can be applied easily without complex program-ming,and it can be simply realized by the construction of DCS configuration module,which has great value of application and promotion.
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