Economic Load Dispatch (Solved Problem 1), Power Systems, Electrical Engineering, GATE Video Lecture

hello welcome to economic dispatch
section one presented by dr. Peter Ochs
in general there are many types of
generator sums are expensive sums are
cheap therefore we need to perform
economic dispatch to plan for each
generator how much real power it should
produce to obtain the least total
production cost suppose there are two
generators supplying power at the same
bus these two generators are in
operation for this our generator G 1 is
cheaper this cost function is 1200 baht
per megawatt hour whereas generate 32 is
more expensive its cost function yes mm
battle maker what our Lord demon is 100
megawatt if it is possible we would like
to use generate 31 to produce and supply
all real power 100 megawatt and let
generate 30 to not produce at all
however there are generation limit
constraints generation output must be
higher than 20 megawatt and less than
100 megawatt therefore generally 32 must
produce at least 20 megawatt and
generator g1 should produce the rest of
power requirement 80 megawatt total cost
is one hundred thirty six thousand five
if we change load demand to be 150
megawatt even g1 is cheaper it could
produce only one hundred megawatt
let's eat you produce the less power
required 50 megawatt this cost total
production cost two hundred twenty
thousand bucks now examine another
problem these two generators supply
power for Lord Iman two hundred megawatt
at the same bus g1 cost function is one
thousand baht per megawatt hour whereas
deaths of Jeju yes 1500 baht per
megawatt hour
try to dispatch this problem and
calculate total production cost g1 is
cheaper but it could produce only 150
megawatt whereas t2 must produce at
least 50 megawatt this result in total
production cost two hundred and twenty
five thousand five can you expect what
happened
if Lord clams up to 220 megawatt let's
think about it
one two three the answer is g2 will
produce the addition of load 20 megawatt
since t1 has already reached his upper
limit
now we put one more for strength
transmission i constrained power flow in
cosmic life must not more than 15
megawatt even though t1 is cheaper but
it could not produce more than 50
megawatt because of lighting me t2 must
produce there is power 100 mega watt to
supply the Lord 150 megawatt let's
examine another problem there are two
generators which supply real power at
different buses clinking with a
transmission line which is limited 100
megawatt Lord 200 megawatt at birth to
try to perform economic dispatch and
calculate total cost
g1 is cheaper 1,000 but we'll make a
walk out but it should produce only 100
mega watt to satisfy my limit t2 should
produce 100 mega watt the total
production cost is two hundred and fifty
thousand by listing further what should
we do if we have local load at bus one
120 make Awad one two three
the answer is p1 is 150 megawatt p2 is
170 mecha watt do you know the reason
why I'm sure that you can fry the answer
by yourself we perform economic dispatch
with the objective function minimize
total production cost while satisfying
power balance constrained at any time
power supply must equal to load demand
in case of two generators P 1 plus P 2
should equal 2 Lord demand and power
from each generator must be within the
generation limit lower limit and upper
limit and transmission line constrain
should be taken into consideration
do you have any questions someone may
think why we must perform economic
dispatch to accomplish objective minimum
total production cost
let's sing together a few seconds one
two three
the answer is the sheeple power plants
in case of the same type of power plant
would be more efficient it means that
they used less input to produce the same
amount of output less fear a less
environmental impact in addition high
production costs will reflect people in
electricity bill the next question what
should we do if it could not satisfy all
constraints one two three
there are many possible solutions
rescheduling power plans starting more
power plans or shutting down some power
plants or Lord cattleman etc what will
happen is power plants produce higher
than their upper limits listening
together one two three their efficiency
will reduce dramatically resulting in
much more fuel consumption and
consequently reflecting in higher cost
and higher pollution emission the last
question are there other constraints yes
there are many RL constraints such as
environmental constraints fear
constraints ramp up and gram dhal
constraints etc this content is a simple
economic dispatch introduction to basic
concept thank you for your attention
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