基于动态矩阵控制算法的微波加热温度控制

Microwave Heating Temperature Control Based on Dynamic Matrix Control

微波加热具有加热速度快、均匀性好以及体加热等优点,已广泛应用于食品、材料、化工以及医药等领域。在实际应用中,一般采用比例-积分-微分控制(Proportional Integral Derivative control,PID)算法来控制加热过程的温度,以达到较好的加热效果。然而,基于PID算法的微波加热温控系统存在控制速度较慢、超调量较高以及稳态误差较大的问题。为此,本文提出了采用动态矩阵控制(Dynamic Matrix Control,DMC)算法,实现对微波加热过程的快速稳定控制。本文首先介绍了DMC算法的基本原理。然后以土豆为例,搭建了基于固态源的微波加热系统,并测量了系统的模型参数,讨论了优化时域、校正系数、控制系数和控制时域等参数对控制系统性能的影响。最后与PID控制算法的实际控制结果进行了比较。结果表明,与PID算法相比,本文提出的基于DMC算法的微波加热的温度控制,其超调量减小了69.8%,上升时间减小了22.2%,调整时间减小了64.9%,最大稳态误差减小了22.9%。

Microwave heating is known for high heating speed,high uniformity and bulk heating capabilities,which makes it a popular choice in various industries such as foods,materials,chemicals and pharmaceuticals.In practical applications,the Proportional Integral Derivative(PID)control algorithm is commonly used to regulate heating temperatures for optimal results.However,traditional PID-based microwave heating temperature control systems face challenges of slow control speed,high overshoot and significant steady-state error.To address these issues,the Dynamic Matrix Control(DMC)algorithm is used to achieve fast and stable control of microwave heating process.The fundamental principle of the DMC algorithm is introduced.A microwave heating system based on solid-state source is constructed with potatoes as the test subject.The model parameters of the system are measured,and the effects of various parameters such as time domain,correction factor,control factor and control time domain on system performance are analyzed.The results obtained from the DMC algorithm are compared with those of the PID control algorithm,and it demonstrates a notable reduction of 69.8%in overshoot,22.2%in rise time,64.9%in adjustment time,and 22.9%in maximum steady-state error.