1. Load curves - Types of Load Curve
2. Load duration curve

**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.

**Base Load:**

The unvarying load which occurs almost the whole day on the station

**Peak Load:**

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

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Power System Operation and Control : Introduction : Economic of Generation |

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