Table 1 Comparison of recent research of existing SMCs for LFC.

From: Multi-stage sliding mode control design with optimal state estimator for load frequency regulation in hybrid-source power systems

References

Type of SMCs

Sensors

Type of turbines

Models considered

Published work27

Proportional—integral

No

Non-reheat

No

Published work28

Proportional—integral

No

Reheat

RESs and EVs

Published work29

Double proportional—integral

Normal state observer

Non-reheat

PVs

Published work30

Proportional—derivative

No

Non-reheat

No

Published work31

Super-twisting proportional—derivative

No

Non-reheat

WTGs and ESSs

Published work32

Proportional—integral—derivative

No

Reheat

No

Published work33

Traditional

Extended observer

Reheat

WTGs

Published work34

Higher-order

Normal state observer

Non-reheat

No

Proposed work

Multi-stage

Optimal state observer

Reheat, hydro, gas

WTGs, PVs, BESSs, and FESSs