摘要
针对过程控制系统中部分温度回路由于大滞后引起的振荡不易收敛问题,提出一种单边死区HDB-PID控制算法。在偏差进入死区时停止PID输出的累加趋势,减弱被控参数向超调方向的发展;当偏差过零时输出立即反向,提前开始纠正超调,以减小过度过程振荡幅度并加速衰减。利用惯性加纯滞后数学模型模拟温度对象,基于PLC可编程控制器和组态软件编制了仿真程序,结果表明,单边死区HDB-PID控制算法能够有效改善大滞后控制过程的超调和振荡问题,收敛速度明显加快,控制效果优于相同参数的常规PID控制算法。该算法实现简单,调试方便,易于在原装置PLC或DCS系统中实施,在过程控制生产实践中具有良好的推广价值。
In view of the oscillation and the difficulty to convergence problems caused by large time-delay in some temperature loops of process control system, a new HDB-PID control algorithm is proposed. When the deviation enters the dead band, the increase of PID output is stopped, and the development of the controlled parameters to overshoot direction is weakened. When the deviation is over zero, the output is immediately reversed to correct the overshoot and shorten time of transient process. Using the inertia plus time-delay mathematical model to simulate the temperature object, the simulation program is compiled with the PLC and the configuration software. The simulation results show that the HDB-PID control algorithm can effectively resolve the problem of overshoot and oscillation in the large delay control process. The control effect is better than the conventional PID control algorithm with the same parameters. The algorithm is simple and easy to be implemented in PLC or DCS system, and has good popularization value in process control production practice.
出处
《计算机与应用化学》
CAS
2015年第12期1462-1464,共3页
Computers and Applied Chemistry
基金
国家自然科学基金资助项目(换热网络优化改进及最优控制的理论及方法研究
项目批准号:21276103)
关键词
PID
死区
仿真
滞后
PID
dead band
simulation
time-delay
