Chapter: Power System Operation and Control - Introduction

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Economic of Generation

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

ECONOMIC OF GENERATION

 

1. Load curves

 

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 .

 


 

Types of 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

 

Daily 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.

 

Monthly 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.

 

Yearly 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


 

2. Load duration curve:

 

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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