基于模糊控制的热力除氧器控制

Thermal Oxygen Remover Control Based on Fuzzy Control System

热力除氧器是火电机组给水加热系统的重要设备.水位和压力是除氧器控制的主要调节参数,对二者的快速、精确控制,对于提升除氧器的除氧效果意义重大.传统的PID控制依赖于被控对象的数学模型且未考虑参数的耦合,由于除氧器是非线性、不确定性系统,数学模型难以描述,其控制品质较差.提出了通过模糊控制结合模糊前馈补偿的热力除氧器控制方案,即采用模糊控制,不依赖于数学模型,且充分考虑了参数耦合问题,利用模糊前馈补偿实现解耦.仿真结果表明,该控制方法的控制品质较为理想.

Thermal oxygen remover is a significant equipment of the water supply system in the fossil power plant.Its liquid level and pressure are major regulation parameters.It is important to precisely control the two parameters for the effect of removing oxygen.The traditional PID depends on the model of the controlled object without considering their parameters coupling.Its control quality is not good because thermal oxygen remover is a nonlinear and uncertain system.The intelligent control methods are adopted which do not depend on the model and consider the parameter coupling enough well.Moreover,the fuzzy feedforward compensation is used to decoupling.The simulation results prove that the control quality of the proposed control method is satisfying.