PID Controller Application:
PID Controller is a controller which is based on a particular fixed structure controller family, the so-called PID controller family.This note examines a specific control structure that is almost used in a universal level for industrial control.
These controllers have proven to be extremely beneficial and robust in the control of many important applications. Here PID stands for:
- P - Proportional
- I - Integral
- D – Derivative
Four Modes of Controllers:
- Proportional (P)
- Proportional plus Reset (PI)
- Proportional plus Rate (PD)
- Proportional plus Reset plus Rate (PID)
Characteristics:
- We can reduce the rise time by using a proportional controller (KP) boot, this process is not available for eliminating the steady state error.
- The steady-state error can be eliminated for a constant or step input in the integral control (Ki) but, transient response of this process may slower
- For increasing the stability of the system we use derivative control (Kd) also, it is used to reduce the overshoot, and improves the transient response.
- When we change any variable from the above given controls, it can effect on the working of other two.
- In PID controller we combine the values of P, I, D (P+I+D).
- All the necessary dynamics are available on this controller like:
- Suitable action in the control error area to eliminate oscillations (P mode).
- Increase in control signal to load error towards zero (I mode)
- Fast reaction to change of the controller input (D mode).
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