摘要
针对汽包水位控制系统具有强干扰、非线性和时变等特性,提出一种线性自抗扰技术的控制方案。同时,提出用误差和控制量的变化量构成目标函数,依据实际系统对两者的要求,选择目标函数的加权因子,寻找优化问题最优解,从而将线性自抗扰控制器参数的整定问题变成优化问题。仿真结果表明:与传统PID控制相比,线性自抗扰控制在汽包水位控制系统中具有更好的控制效果,且系统具有更强的抗干扰能力;以实际系统中的控制量变化速率为约束条件,建立目标函数,整定控制器参数,由此设计的控制器更符合实际系统中控制量变化率在一定范围内的要求,控制器更具有实际意义。
According to the characteristics of drum water level system,such as strong disturbance,nonlinear and time varying,a linear auto disturbance rejection control（LADRC）technique was proposed.Moreover,the objective function which is composed of the error and the rate of the controlled variable change was presented.According to the requirement of the actual system,the weighted factor of the objective function was selected,and the optimal solution was searched.Thus,the parameters of the linear auto disturbance rejection controller can be regulated,and parameter adjustion became an optimization problem.The simulation results show that,compared with the conventional PID controller,the linear auto disturbance rejection controller has better control effect in drum level control system,and it makes the system have stronger anti disturbance ability.The controller satisfies the requirement that the change rate in actual control system is limited.The design of the controller has a practical meaning.
出处
《热力发电》
CAS
北大核心
2016年第7期110-114,共5页
Thermal Power Generation
关键词
汽包
水位
控制系统
线性自抗扰
目标函数
强干扰
约束条件
drum
water level
control system
linear auto disturbance rejection
objective function
strong disturbance
constraint condition
