火电厂主汽温控制系统的免疫PID串级控制

Immune PID Cascade Control of Fresh Steam Temperature Control System in Fossil-fired Power Plant

火电厂主汽温控制系统具有大惯性、大延迟和时变等特性,采用常规PID串级控制方法的主汽温系统难以获得满意的控制效果。生物免疫系统是一种在大量干扰和不确定性环境中都具有很强鲁棒性和自适应性的系统。借鉴生物免疫反馈响应过程的调节规律,提出将免疫PID串级控制策略应用到火电厂主汽温控制中,针对某超临界600MW锅炉高温过热器在4个典型工况点的仿真研究表明,该策略的控制效果优于常规的PID串级控制,它能适应对象参数的变化,具有较强的鲁棒性和自适应能力。图5表2参8。

Since fresh steam temperature control systems of fossil power plants are characterized by large inertia, long time lag and variation with time, satisfying control effect can not be achieved with traditional control methods of fresh steam temperature systems which use the normal PID cascade control methods. Biology immune systems are characterized by their strong robustness and self-adaptability even when encountering strong disturbances and uncertain conditions. Prompted by the regulation law of immunity feedback response in biology, immune PID cascade control is being suggested for controlling fresh steam temperature in fossil-fired power plants. Simulation studies of high temperature superheaters under 4 typical operating conditions of a certain supercritical 600 MW power boiler show that the control effect by this strategy is superior to that of normal PID cascade control. It is featured by strong robustness and self-adaptability, and can readily accommodate itself to the object's parameter variations.