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

34 The impacts of wind power on price formation and production patternsPower4000,0[MWh/h] 3500,03000,02500,02000,01500,01000,0500,00,0Hourly average of el. production vs. el. demand01:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:0000:00Hours of the day [h]400035003000 El. demand2500Decentralize2000 d production1500 Central1000 production500 Windpowerproduction06005004003002001000CLOSE UP: Average daily variationof windpower [MWh/h]1 3 5 7 9 11 13 15 17 19 21 23Hours of the day [h]Figure 4.4, Left, is the hourly average of production and consumption showing that the differencesin production and consumption, previously seen on a monthly basis, seems to be distributed to allhours. Right graph is a close-up of the wind profile, showing that also wind varies throughout anaverage day (Data source: Energinet.dk).In terms of co-generation, we saw in section 3.3.1 how backpressure units have a fixedheat-electricity ratio given by the cm value, and that extraction units have a variablepower-heat ratio. In this project, the assumption is that backpressure units generallyconstitute the decentralized production, as extraction units constitute the central production.In order to confirm this, Figure 4.5 and Figure 4.6 show two plots of the averageheat production divided by the electricity production in the particular hour – this on anhourly and monthly basis, respectively (both standardized). As expected, the power-heatratio of the decentralized productions is locked (with an estimated cm value of 67 %, giving1.5 units of heat per unit electricity unit), while this relation for central el. productionvaries during an average day as well as throughout the year (with a factor of 0.43units of heat in summer season 16 to 0.81 during winter, per generated unit electricity).This way, production data supports the fact that decentralized backpressure units, asmentioned earlier, are better at delivering heat than electricity, due to lower cm values –the opposite being the case for the central units. The calculated power-heat ratio seenabove makes decentralized power production a good indicator for heat demand.16With summer season defined as May to October.

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