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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。
Aiming at the problem that the partial temperature loop in the process control system is not easily converged due to the large lag, an unilateral dead-zone HDB-PID control algorithm is proposed. When the deviation into the dead zone to stop the accumulation of PID output trend, reducing the controlled parameter to the overshoot direction of development; when the deviation of zero output immediately reverse, early start correcting overshoot to reduce the excessive process of oscillation amplitude and accelerate the attenuation . The simulation object is simulated by using the inertia and the pure lag math model and the simulation program based on the PLC and the configuration software. The results show that the HDB-PID control algorithm can effectively improve the overshoot and oscillation of the large hysteresis control process , The convergence speed is obviously accelerated, and the control effect is better than the conventional PID control algorithm with the same parameters. The algorithm is simple to implement, easy to debug, easy to implement in the original PLC or DCS system and has good promotion value in the process control production practice.