一种改进的动态设定值PID控制算法

An Improved Dynamic Setpoint PID Control Algorithm

PID控制器是一种调节控制器,具有良好的稳定性和可靠性,是工业控制的主要技术之一。它根据系统的误差,利用比例、积分、微分计算出控制量。传统PID控制算法的微分项抗干扰能力较弱,经常出现输出值和反馈值突变的现象,对动态控制环境适应不足,尤其在多设定值时无法满足控制要求。为了减少设定值改变时微分项引起的输出值和反馈值的震荡,在增量式和微分先行式算法的基础上,对PID控制算法做出进一步改进,并与传统PID控制方法进行比较。理论值及测试结果均显示改进的PID控制算法在改变设定值附近的输出和反馈震荡减小,全变分模型比较的结果表明改进的PID算法输出值曲线最平滑,此种方法能够提高动态设定值控制系统的稳定性和精准性。

PID control is a kind of regulating controller with good stability and reliability.It is one of the main technologies of industrial control.According to the error of the system,it uses proportion,integral and derivative to calculate the control quantity.The differential term of the traditional PID control algorithm has weak anti-interference ability,frequent sudden changes in the output value and feedback value,and insufficient adaptation to the dynamic control mode environment,especially when there are many set values,which cannot meet the control requirements.In order to reduce the oscillation of output value and feedback value caused by differential term when setpoint changes,on the basis of incremental PID and previous difference PID algorithm,the PID algorithm is further improved and compared with the traditional PID control method.Both the theoretical value and the test results show that the oscillations of output value and feedback value of the improved PID algorithm are reduced when the setpoint is changed.The comparison result of total variation models shows that the output curve of the improved PID algorithm is the smoothest,and this method can improve the stability of dynamic setpoint control system.