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本文研究在已知过程的传递函数为Gp(s)=Kpe~■/τs+1的形式后,用衰减频率特性法,利用调整PID数字控制器中的I与D的比值,使系统有合适的主导极点,在阶跃扰动作用下,系统响应不但呈现确定的衰减比,且又使单位负荷变化下的误差和为最小,来寻求PID数字控制器的最佳整定数据。利用这一方法,导出了过程参数,采样周期与PID数字控制器等诸参数之间的关系,计算并绘制了供现场整定用的致据,图表,经仿真研究,结果是满意的。
In this paper, after the transfer function of the known process is in the form of Gp (s) = Kpe ~ ■ / τs + 1, the system is suitable by using the method of decaying frequency and adjusting the ratio of I to D in the PID digital controller Under the action of step disturbance, the system response not only shows a certain attenuation ratio, but also minimizes the error under the unit load change to seek the best setting data of PID digital controller. Using this method, the relationship between process parameters, sampling period and PID digital controller and other parameters is deduced, and the data and graphs used for field setting are calculated and plotted. The results are satisfactory.