基于QFT的火电厂主汽温控制系统的设计与仿真

Design and Simulation of Fresh Steam Temperature Control System in Power Plant Based on QFT

火电厂主汽温控制系统具有大惯性、大延迟和时变等特性,采用常规控制方法的主汽温控系统难以获得满意的控制效果。定量反馈理论是目前鲁棒控制领域中具有较强工程应用价值的一种设计方法。首先将火电厂主汽温控制系统对象简化成为具有三参数变动的不确定模型,应用QFT的基本原理,设计了边界稳定的鲁棒控制器,保证了稳态精度5%和过渡过程时间小于1秒。仿真结果表明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。

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, QFT （quantitative feedback theory） is a very practical design technique in the field of robust control. The fresh steam temperature control system in power plant was simplified into a model with three changing parameters, QFT basic principle was introduced, robust controller with stable boundary was designed, steady state accuracy 5% and response time less than 1 second were ensured. The simulation result indicates that it is featured by strong robustness and self-adaptability, and can readily accommodate itself to the object＇s parameter variations.