ECONOMIC OF GENERATION
The curve showing the variation of load on the power station with respect to time
Ø The curve drawn between the variations of load on the power station with reference to time is known as load curve.
Ø There are three types, Daily load curve, Monthly load curve, Yearly load curve .
Daily load curve–Load variations during the whole day
Monthly load curve–Load curve obtained from the daily load curve
Yearly load curve-Load curve obtained from the monthly load curve
Ø The curve drawn between the variations of load with reference to various time period of day is known as daily load curve.
Ø It is obtained from daily load curve.
Ø Average value of the power at a month for a different time periods are calculated and plotted in the graph which is known as monthly load curve.
Ø It is obtained from monthly load curve which is used to find annual load factor.
The unvarying load which occurs almost the whole day on the station
The various peak demands so load of the station
When the elements of a load curve are arranged in the order of descending magnitudes.
The load duration curve gives the data in a more presentable form
Ø The area under the load duration curve is equal to that of the corresponding load curve
Ø The load duration curve can be extended to include any period of time