- 2079 Asoj · 2 marks
Why integral controller is needed
Short answer
Integral control eliminates steady-state error by accumulating error over time, driving output until error becomes zero. Unlike proportional-only control which needs non-zero error for non-zero output, the integrator holds the exact output to cancel constant disturbances. Drawbacks include slower response, potential overshoot, and need for anti-windup during actuator saturation.
Why is an Integral controller needed in a control system?
An integral controller is needed to remove the steady-state error. A P-only controller needs a non-zero error to produce a non-zero output, so a constant disturbance (for example a hill in cruise control) leaves a permanent offset between set-point and output.
The integral term accumulates the error over time, so the control output keeps changing until the error becomes exactly zero. At steady state the integrator holds the exact output needed to cancel the disturbance, so the output equals the set-point. The price is slower response and possible overshoot, and the integral must be limited (anti-wind-up) when the actuator saturates.
✓ Answer checked by Claude Opus 5.5 (high effort)
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