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从数学上建立了预测控制与PID控制的广义联系,并结合某火电厂300MW锅炉机组,针对烟气氧含量控制回路,在不改变原有控制系统框架的基础上,采用基于GPC的PID控制方法,很好地解决了在锅炉负荷和氧含量设定值同时变化的情况下系统的动态响应不理想的问题。通过MATLAB仿真,验证了该控制系统具有较好的控制品质,适合具有一定延迟的复杂控制系统。
A generalized connection between predictive control and PID control is established mathematically. Combining with a 300MW boiler unit of a thermal power plant, aiming at control loop of oxygen content in flue gas without changing the framework of the original control system, a GPC-based PID control method , Which solves the problem that the dynamic response of the system is unsatisfactory under the condition that the boiler load and the set value of the oxygen content simultaneously change. Through MATLAB simulation, it is verified that the control system has better control quality and is suitable for a complex control system with a certain delay.