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Which electrical network produces a phase lag at one frequency region and a phase lead at another frequency region?

Which electrical network produces a phase lag at one frequency region and a phase lead at another frequency region? Correct Answer Lead Lag network

Phase lag-lead compensation:

1) For an unstable uncompensated system, lead compensation provides fast response but does not provide enough phase margin whereas lag compensation stabilize the system but does not provide enough bandwidth. So we need multiple compensators in cascade.

2) Lag-Lead compensator is an electrical network which produces phase lag at one frequency region and phase lead at other frequency region. It is a combination of both the lag and the lead compensators.

Advantage:

1) Due to the presence of phase lag-lead network the speed of the system increases because it shifts gain crossover frequency to a higher value.

2) Due to the presence of phase lag-lead network accuracy is improved.

 

Key Points

Compensation

 

Lag

It produces a sinusoidal output having the phase lag when a sinusoidal input is applied.

A system which has one zero and one dominating pole ( the pole which is closer to origin that all other poles are known as dominating pole)

Lead

It produces a sinusoidal output having phase lead when a sinusoidal input is applied.

A system which has one pole and one dominating zero (the zero which is closer to the origin than all over zeros is known as dominating zero.)

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