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

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

Building the Mathematical Model 55It is in this connection relevant to remind that the scope was to build a model with someof the same characteristics as the Danish energy system, which can be used to help clarifyhow increased wind penetration will affect the system, as well as how different toolsfor increased production flexibility might reduce some of the documented problems – notto create a perfect approximation of the West Danish heat- and power system. However,a great part of the system characteristics, when it comes to dimensioning the productioncapacities as well as the profiles for wind production and the heat- and electricity demands,are either heavily inspired by, or have directly been taken from, data of theWestern energy system.5.3.1. Power system simplificationsOne of the key problems of building an optimization model is to find the right balancebetween, on the one side, creating a simple and efficient model that still meets the objectiveof the model and, on the other side, building a compute-heavy, high detailed modelwith great similarities to a real system. Finding the right balance often takes an experiencedmodel programmer, but can also be achieved by starting out with a simple constellationand then, step by step, adding more elements until the final result – althoughthis can be a rather time-consuming process. Figure 5.5 shows the final geographicalsystem.MAIN REGIONEXCHANGE REGION(Hydro)Central CHP-areas (x 7)Decentralized CHP-area (x 1)Extraction units (CHP/coal)Condensing units (El/coal)Backpressure units (CHP/gas)REGIONS (el. transmission)AREAS (CHP distribution)El. peak load facilities (El/oil)Boilers (Heat/gas)Heat pumps (Heat/el.)*Transmission (lossless)Distribution (lossless)* Not a part of reference scenarioFigure 5.5, An illustrative, graphical overview of the fictional heat and power system used forapproximation of the impacts from increasing wind power as well as inclusion of heat pumps andbypass.Transmission regions and distribution areasAs seen above the geographical system has been limited to consist of just two regionswith the exchange region approximated as mainly the Norwegian hydro system. Bydoing this, intention is to imitate the storage mechanism of today’s wind-hydro interplay

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