Load Curve
The Load on the power station is not constant, but varying
time to time. The curve obtained by plotting Time in hours (Day, month or year)
on X-AXIS AND Load (KW or MW) on Y-axis is known as daily load curve. From the
daily load curves of a particular month, the monthly load curve can be obtained
by calculating the average values of power at a particular hour on each day.
The yearly/annual load curve can be obtained by considering all monthly load
curves of a particular year.
The load curve for Sunday or holiday is different from load
curves of other days of the week. Also the load curve for summer and winter
will be differ. The curve for rural and urban area will also differ. The typical
daily load curve is show in fig from the load curve we can know the following
information.
- The variation in load during different hours of a day.
- The area under load curve represents the total number of units generated (in KWH) in a day.
- The maximum and minimum load in a day.
- The
area under load curve (in KWH) divided by number of hours (24 hours) give the
average load on the power station.
- The
area under load curve divided by area of rectangle in which it is contained
gives load factor.
Load duration cure:
This curve also gives the variations of load. But in this
curve all the load are arranged in descending order of magnitudes i.e. greatest
load on the left and least loads on the extreme right. This curve gives the
number of hours for which a particular load is on the power station. The area
under this curve also gives the number of units generated. a) Show load curve. In
load curve the maximum demand (load) is 25 MW from 6p.m to 8p.m (i.e. 2 hours).
This maximum load is potted in the left side of b) and all the remaining loads
are arranged in descending order which gives load duration curve.
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