# Integration of 50 % wind power in a CHP-based ... - Ea Energianalyse

Integration of 50 % wind power in a CHP-based ... - Ea Energianalyse

72 Model resultsChapter 6.Model results6.1. Overview of the modeled resultsIn this chapter, the results of the model calculations will be reviewed and analyzed. Theresults will be addressed one by one according to subject, which means, that for eachsubject, the results of the three different system scenarios (reference, bypass and heatpump) subjected to the different wind profiles (2008, 2017 and 2025), will be reviewedand analyzed. This means overall that the results have been modeled according to a“three-times-three” sequence as illustrated by Table 6.1 below.The subjects of the analyses being: energy prices and production patterns from thermalunits. Result on the economy and the environmental effects will be reviewed in the followingchapter. In this way, the full picture of the consequences of increased wind penetrationon all the different subjects will emerge through the two chapters.Throughout the chapter the terms ‘reference scenarios’, ‘bypass scenarios’ and ‘heatpump scenarios’ will be used with reference to the reference scenario, the bypass scenarioand the heat pump scenario, all three being subjected to the three wind profiles, respectively.Wind capacity “2008” Wind capacity “2017” Wind capacity “2025”Reference scenarioBypass scenarioHeat pump scenarioTable 6.1, Illustration of the three system scenarios being subjected to the three different windcapacities, resulting in nine different result output.The time factor of the modeling and the related problemsThe modeled scenarios have been optimized over periods of one month, in general, whichas a whole covers one year (meaning that 12 periods have been optimized in this case).However, an unfortunate aspect of solving the mixed integer problem (that the Unitcommitment problem is) is that the branch and cut process sometimes continues for avery long time, still searching for the optimal solution (GAMS 2007). As a result, it issometimes necessary to put a limit to the process by setting the gap size of the solution(see appendix 11.3) at a higher level than necessarily desired. Because the scenario withoptional by-pass operation (BPO) includes an extra integer constraint b(i,t), the computationtime increased intensively, and so did the error margin. The bypass scenario has

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