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

ea.energianalyse.dk

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

Model results 97Another main difference between the model and West-DK, allowing higher wind productionin the modeled system than in reality, is the average level of export in the hourswith critically low prices, which is about twice as high in the model as in West-DK. Incase this difference is due to lower external transmission capacities, one might argue,that this problem has been taken into account in the model, given that the interconnectionof the model was fixed with the capacity of 1200 MW (for a realistic approximation),corresponding to the sum of the average announced capacities towards Norway andSweden (being 1000 and 650, respectively under normal conditions). Moreover, neglectingGermany as export-option should theoretically create bad enough export conditionsto approximate reality. Nonetheless, the model still has a higher export rate. Although areason for this could be that a part of the low prices are created externally, makingWest-DK an importer for a few hours (see yellow area), it was proven in section 4.6 thatthe vast majority of critically low prices were generated internally. Therefore, the ratherlow export-level observed in West-DK (Figure 6.22), seems to be caused by bad conditionsfor external transmission.Instead of discussing expansions of the external capacity, or how to improve utilization,(for instance through more effective congestion management), which normally is discussed,focus in this project is on feasible ways of reducing the heat-forced electricityfrom the central extraction units and the decentralized backpressure units – in the figureindicated by the red and green areas. In the following section the impacts of extractionunits with optional bypass-mode on the production patterns will be reviewed.Power generation in bypass scenarioIn this section the optimized results of electricity generation in the full-scale bypass scenariowill be reviewed. As in the earlier section, the shown result are from the first weekof January and November (Figure 6.23 and Figure 6.24 respectively), both subjected tothe windy profile (first week of 2025 wind capacity-profile). As mentioned in the previoussections, the results of the full-scale bypass scenario are given as rough optimizations,which in the case of “on-off” switching of bypass mode, may have influenced the level ofdetail in the model. Reserve capacity restrictions are assumed uncompromised by thefull-scale bypass solution, c.f. equation (5.28) in the model description (chapter 5), asunits are regarded as committed when operating in bypass mode (for further elaborationsee heat production-patterns later in section 6.3.2).

More magazines by this user
Similar magazines