摘要
化学反应釜温度控制系统具有时变性、非线性、滞后性等特点,数学模型和参数难以精确得到,严重影响了温度控制的快速性和鲁棒性。为解决这些问题,设计了一种智能模糊自适应PID(Intelligent Fuzzy Adaptive PID,IFA-PID)控制算法,当误差较大时采用模糊控制,误差较小时采用微分独立模糊自适应PID(Fuzzy Adaptive PID,FA-PID)控制,通过切换函数实现两种控制方式的平滑切换,实现了2种控制方法的有机结合和优势互补。利用MATLAB的Simulink仿真工具箱建立模型,并做了传统PID、FA-PID以及IFA-PID在模型匹配及失配情况下的仿真对比实验。仿真结果表明,IFA-PID在超调量、调节时间等性能指标上都优于其他两种控制算法,具有更好的适应性和稳定性,能提高系统的品质特性和控制精度。该算法能够有效地克服模型失配和系统参数变化等情况,特别适合时变滞后非线性系统的控制。
The temperature control system of polymerization reactor has characteristics of time-varying, nonlinearity and lag, and it is difficultto create the mathematical model and get the parameters precisely, which seriously affects the rapidity and robustness or temperature control system. An intelligent fuzzy adaptive PID （IFA-PID） control algorithm is proposed in order to solve the problems. The fuzzy control is used when the error is large and the fuzzy adaptive PID （FA-PID） control with independent differentiation is used when the error is small. Furthermore, a smooth handoff is achieved by switching function between the two control modes, thus the complement of the advantages and organic combination has been realized. Then the simulation model is created in Simulink toolbox of Matlab for simulation comparison experiment of traditional PID control, FA-PID control and IFA-PID control under model matching and model mismatch. Simulation results show IFA-PID is better than the other two algorithms in overshoot, settling time and other performance index, in addition, it has better adaptability and stability, and it can improve the quality characteristics and control precision of system. The presented algorithm can effectively overcome the model mismatch and narameters variation, which is very suitable for the control of nonlinear system with time-varying delay.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2013年第2期121-124,共4页
Computers and Applied Chemistry
基金
安徽省高校自然科学基金项目(No.KJ20112310)
合肥师范学院自然科学基金项目(No.2011kj06)
关键词
化学反应釜
温度控制
模糊控制
模糊自适应PID控制
平滑切换
polymerization reactor, temperature control, fuzzy control, fuzzy adaptive PID control, smooth switch
