采用PI加棒控制时直流双环调速系统的起动超调

THE STARTING OVERSHOOT OF A TWO CLOSED-LOOP DC MOTOR SPEED CONTROL SYSTEM WITH PI PLUS BANG-BANG CONTROLLER

本文讨论了将传统的直流双环调速系统中速度控制器改为PI加棒棒控制器时的起超调问题.该控制器的基本原理为:当给定信号和转速反馈信号之差的绝对值小于某一指定的门限值η时,控制器采用PI调节方式,否则控制器就输出最大的允许值并使PI调节器的积分部份置零.文内还给出了门限值η的选择原则,超调和峰值时间的计算方法.计算机仿真和实验表明这种方法大大地减少了起动超调,而调整时间基本不变.

Given great inspiration from the referrence[1], this paper discusses the starting over- shoot of speed controller with PI plus bang-bang action for a two closed-loop DC motor speed control system. The principle of the controller is as follows : When the magnitude of error between the reference signal and the speed feedback signal is smaller than some pre- scribed value η, the controller emplays the PI-action, otherwise the controller produces the maximum allowable control signal with the integrator reset. Moreover a rule of thumb of the selection of η is given and the analysis of the starting overshoot of the system is pre- sented. The simulation and experiment results show that the starting overshoot of the sys- tem is much smaller than those of the system only with limited PI controller.