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Question

The increment cost curves of three generators are shown, the demand on the system is 240 MW.
For economic load dispatch the generators schedule is





A
P1=20 MW,P2=70 MW,P3=150 MW
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B
P1=20 MW,P2=150 MW,P3=70 MW
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C
P1=50 MW,P2=50 MW,P3=90 MW
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D
P1=20 MW,P2=90 MW,P3=130 MW
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Solution

The correct option is A P1=20 MW,P2=70 MW,P3=150 MW
G1 is high cost generator, so it will supply minimum power,
P2+P3=220 MW, P1=20 MW
From the curve,(IC210)=0.1(P250)
IC2=0.1×P2+5
For economic dispatch
IC2=IC3
0.1×P2+5=12
P2=70 MW
P3=150 MW

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