Design of Lead and Lag Compensators usingFrequency Domain Techniques

Prof. Wonhee Kim

Energy System Engineering, Chung-Ang University

Steady-state Error

System Type

Damping Ratio from Phase Margin

Damping Ratio from Phase Margin

Frequency domain analysis

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Bode Diagram

Compensators and Bode diagram

Lead Compensator

Lead Compensator

Lead Compensator

Bode Design Principles (lead)

Design Guidelines

Example

Example

Bode Diagram

Step Response

Ramp Response

Ramp Response, Detail

Lag Compensators

What will lag compensation do?

Qualitative example

Bode Design Principles (lag)

Design Guidelines

Example, same set up as lead design

Example

Example: Compensated open loop

Step Response

Ramp Response

Ramp Response, detail