Improper tuning of PID parameters of the control system will also cause the control system to produce varying degrees of oscillation. If the proportional gain of the single-loop PID regulator is too large, the integral time is too short, the differential time and the differential gain are too large, it may cause the system to oscillate and cause the actuator to oscillate. For multi-loop control systems, in addition to the above reasons, there is also a problem of mutual influence between loops, resonance problems due to improper parameter tuning. In view of the existing problems, the PID parameters can be re-adjusted to make the control loop have a certain stability margin without affecting the production and meeting the requirements of process control.
