Question
Download Solution PDFWhich of the following in steady State Accuracy is High?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLag compensator:
The transfer function of a lag compensator is given by
Where,
- Both pole and zero lie in LHS of real plane but PC < ZC i.e. zero is farther away from origin
- Lag Compensation adds a pole at origin (or for low frequencies).
- It helps to reduce the steady-state error of the system.
- An unstable system is a system which has at least one pole at the right side of the s-plane,
- Even if we add a lag compensator to an unstable system, it will remain unstable.
Effects of phase-lag compensator:
- It improves the steady-state response
- It makes the system dynamic response slower. Reduces steady-state error
- Increases the rise time
- Decreases the bandwidth
- Reduces stability margin i.e. the system becomes less stable
Explanation:
Phase lag compensation is an integrator, as it reduces the steady-state error and increases steady state accuracy.
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