Power system operations and control: Difference between revisions

Revision as of 05:58, 30 May 2022

Revision as of 06:02, 30 May 2022

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| series="cost"

| title=Dispatch curve

| yZero= | xAxis=Demand (MW) | yAxis=Cost ($/MWh) | yMax= | yGrid=y | width=500 | legend=-

| vAnnotationsValues={"text": "Predicted demand", "x": 150}

| hAnnotationsValues={"text": "System lambda", "y": 60}

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| right

}}

The decisions ("[[economic dispatch]]") are based on the '''dispatch curve''', where the X-axis constitutes the system power, intervals for the generation units are placed on this axis in the ''[[merit order]]'' with the interval length corresponding to the maximum power of the unit, Y-axis values represent the marginal cost of a [[MWh]] of electricity. For cost-based decisions, the units are ordered per increasing incrementalmarginal cost (per-MWh), costignoring the startup costs). The graph on the right describes an extremely simplified system, with three committed generator units:<ref name=psu/>
* (A) can deliver up to 120 MW at the cost of $30 per MWh (from 0 to 120 MW of system power),;
* (B) can deliver up to 80 MW at $60/MWh (from 120 to 200 MW of system power),;
* (C) is capable of 50 MW at $120/MWh (from 200 to 250 MW of system power).<ref name=psu/>

== Minutes-ahead operation ==