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

Model results 8380,0070,0060,0050,0040,0030,0020,0010,000,00BPO impacts on electricity pricesEl. price,January[€/MWh]El. price,April[€/MWh]El. price,November[€/MWh]Share ofcritical lowel. prices[%]Bypass (full‐scale)ReferencePrices[€/MWh]SCENARIOSWindyNot windymonth:BPO ref BPO refEL Jan 8.29 3.05 17.00 17.20Apr 9.63 4.90 17.43 17.52Nov 9.61 5.25 18.75 18.75mean 9.18 4.40 17.73 17.82HEAT Jan 19.26 29.14 18.42 18.76Apr 9.13 27.62 18.59 18.52Nov 9.96 27.46 17.60 17.60mean 12.78 28.07 18.20 18.29Figure 6.10, A comparison of the average electricity pricesin two systems exposed to the windy profile – one, withfull-scale BPO, and one being the reference system, showingthat the BPO scenario results in higher electricityprices, as well as a lower probability of electrical overflow.Table 6.6, Shows in numbers the same as in thefigure to the left, plus the drop of the heat price– particularly being the case for April and November.A price drop that is further enhancedby the BPO-caused overproduction of heat, asjust described.Turbine bypass applied to a single extraction unitWhen it comes to the modeling of the bypass on a single extraction unit, it has been possibleto model the entire year without compromising the level of feasibility too much. Inthis scenario, however, only the heat price will be of interest since one unit alone withoptional BPO will not have significant influence on the electricity price.In Figure 6.11 is a plot of the heat-price duration in one distribution area with optionalBPO for the particular extraction unit, exposed to the wind profiles of the 2008, 2017and 2025 scenarios, respectively. As above, the dotted lines indicates the heat price ofthe reference scenario and the massive ones the BPO-scenario. When comparing theheat prices in the two scenarios, it seems as if the heat prices in the system with appliedbypass is relatively untouched by the rather extreme wind profiles of 2017 and 2025,whereas the heat prices in the reference scenario increases when going towards the 2017and 2025 wind scenario – especially when it comes to the higher prices. One of the mainreasons why the price does not increase considerably during the steps of increased windpower, is exactly the PBO option. Normally, as seen in the three reference scenarios, theamount of forced electricity increases as the wind power increases, and thereby shortensthe upper “price block” to the right (see Figure 6.11), or to put in another way: extendsthe amount of low price hours. With the BPO option applied, the amount of forced electricityis reduced and thus, the average price is held constant despite increased wind penetration.As in the full-scale bypass scenario the single unit bypass scenario generates zero-heatprices which, as mentioned above, are caused by the model choosing to overproduce heatin bypass-mode rather than co-generating (in backpressure mode). Because of the spill ofheat, the model registers the marginal MWh of heat as free and returns a zero shadowprice, thus neglecting the interest of the facility owner.

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