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PID fine tuning
. All set parameters of the PID control are related, they need to be adjusted to the
appropriate values. Therefore, the procedure achieving the minimum steady-state is
shown as following:
(1) Increase or decrease the proportion (P) gain until stability and maintain it in the
smallest controlled change.
(2) The additional integral (I) will reduce the system stability which is similar to the
time-fold increase of the gain. This time should be adjusted so the highest
proportional gain can be used without affecting the system stability. Nevertheless, the
increase in time will also reduce the system response.
(3) Adjust the differential time to reduce startup overshoot if necessary. The
acceleration / deceleration time of inverter can also be used for this purpose.
. Fine-tuning of PID control parameter is shown as following:
(1) Reduce overshoot
If overshoot occurs, reduce the derivative time (D) and
prolong the integral time (I)。
(2) Stablize the control status
To rapidly stabilize the control, reduce the integral
time (I) and prolong the defferential time (D) when the
overshoot occurs.
(3) Reduce long-period oscillation
If long periodical oscillation occurs, the periodical
oscillation can be effectively improved by adjusting
the integral time (I).
(4) Reduce short-period oscillation
If periodical oscillation is short, improve the periodical
oscillation by adjusting the differential time (D) and
proportional (P) gain at the same time.
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