What is the difference between traditional economic dispatch and economic dispatch with valve point effect or loading?
'Traditional' dispatch makes a simplification assuming that power plant efficiency increases quadratically, piece-wise linearly or even linearly with the output. However, in real life valves control the steam entering the turbine through separate nozzle groups. Each nozzle group achieves best efficiency when operating (presumably) at full output. So, when increasing the output, valves are opened in sequence in order to achieve highest possible efficiency for given output. The end result is a rippled efficiency curve. For illustration, see e.g. Decker & Brooks, 'Valve Point Loading of Turbines', Electrical Engineering Vol. 77 , Iss. 6, pp. 481-484, 1958.
Dear Juha Kiviluoma, Many thanks for your detailed answer. Actually, my background is not engineering. Could you please suggest me a specific problem that needs to be addressed in the economic dispatch using evolutionary methods. I am looking for a topic which is not very technical on the power systems side. My background is computing.
Unit commitment and economic dispatch (UCED) optimization has been extensively studied (also evolutionary algorithms) and therefore it's good to start by reading some review papers on the topic.
That said, to my understanding evolutionary algorithms can be good in finding neighborhoods with potentially good local minimas, when the solution space topology is highly complex. UCED problems using MIP can be such and therefore evolutionary algorithms may sometimes be appropriate. However, it may be good to switch to more conventional algorithms once potential neighborhoods have been identified, since they should be faster in drilling down towards the optimal.
Another potential application area within UCED is multi-objective optimization. One could minimize in addition to cost also the impacts of harmful emissions, which can be controversial to monetize. A possible open-source tool for multi-objective problems has been co-developed by a colleague at my institute - a link below.
http://www.ibpsa-nordic.org/tools.php
Dear Juha Kiviluoma, many thanks for your guidlines and the link, I will certainly read it and will learn to work on it. I will always acknowledge your help and support.
Dear Juha Kiviluoma , can you explain to the power losses equation in the grid system (it is ion the word file below).
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