26-05-2012, 02:08 PM
Load Frequency Control of Single Area Power Systems having Multi-Source Power Generation
Load Frequency Control of Single Area.pdf (Size: 941.74 KB / Downloads: 185)
Power System Model
A single area power system with hydro,
thermal and gas power generation sources is
considered for the study.
Load Frequency Control is applied only to
thermal and gas power generating units
Hydro is allowed to operate at its scheduled
generation level with only speed governor
control.
Load Frequency Control
A proportional-integral (PI) load frequency control is
applied to thermal and gas power generating units.
• Common LFC for both thermal and gas power generating
units.
• Individual LFC for thermal and gas power generating units.
The LFC performance for above two schemes is
studied with following performance indices.
• ISE, ITAE and (ISE+ITAE)
Simulation Studies
Single area power system is simulated for 1%
step load disturbances for the following cases
• For different nominal loading conditions by
adjusting thermal power generation
• For different nominal loading conditions by
adjusting gas power generation
Observations
It is observed that ISE is more effective in reducing
the first peak of the transient response and ITAE is
more suitable in reducing long duration transients.
The combination (ISE+ITAE) of both is giving better
transient response with less oscillatory.
Individual LFC provides better response that common
LFC.
Performance of the system deteriorates as thermal
power generation decreases.