Replacement Cost and Capital Cost  


Hello everyone,thanks bunch for many ways in explaining the challanges some of us new users are encountering in Homer.

Please, I did a work on Microgrid planning with GAMS, I have like 7 generators in this community.I specified another two generators,the capacities,capital cost and operation and maintenace cost in terms of $/KW(the system will have to decide to buy/add any of these gens if need be or if it runs out of capacity). Now,for the 20years planning horizon,my model found a feasible solution with the existing generators and did not add new gens. I am being asked to validate my results in Homer,I did same,specifying the replacemt cost of each of those 7 generators in Homer with "the capital cost" in GAMS. My result is wierd,Homer is replacing a generator even when it has not exhausted the useful life of the other already existing generators. If I force a very high replacement cost(higher than the capital cost specified in GAMS),Homer finds a feasible solution without replacing any generator. I feel there is something that I am mixing up or really need to be clarified on the operation of HOMER. Please,in GAMS it decides what hour,year and capacity to add if the available is not enough to meet the demand;how do atleast have a close replication of my GAms model in Homer,Should I define a search space with two gens (as in GAMS ) in Homer with capital cost and operation and maintenace cost and put high replacement cost in the old gens.

Please I am really on a hot seat about undertsanding and explaining why my results are different giving same fuel curves in both softwares.

Are there other ways I could have implemented the work in Homer to obtain a similar results as in GAMs



Posted : June 8, 2018 3:19 pm

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