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

The impacts of wind power on price formation and production patterns 45Of the more interesting details in the figures below, is the difference in the utilization ofthe capacities when prices drop. From export situation (1) and (2) is seen that, in caseswhere wind (and likely cold too) causes the electrical spillover, making the export-optioneven much needed, the capacity to Sweden is averagely 47 % and 34 % of rated capacity(normally being averagely 67 %). This means, that the congestion management on capacitiesto Sweden (averagely) is an accomplice factor. Additionally, export-capacities toNorway (70 %) and Germany (70 %) are averagely lower when West-DK has a large export-need,than when the very same countries whishes to export (96 and 87 %, respectively).It is uncertain whether the reduced capacities during these periods of great export-needin West-DK, are to be blamed for on the Danish TSO or the TSOs of the neighboringsystems.Share of import‐export situations during critically low spot prices in West‐DK1) 35.5 % (of time) 2) 35.5 % 3) 4.5 % 4)5.4%35 €34 €29 €4 €-699 MW-709 MW-807 MW813 MWCAP 73 %-321 MWCAP 72 %-242 MWCAP 82 %262 MWCAP 96 %-365 MWCAP 47 %CAP 34 %CAP 71 %CAP 61 %31 €30 €7 €12 €4 €3 € 7 € 6 €340 MWCAP 87 %-288 MWCAP 70 %610 MWCAP 85 %-510 MWCAP 97 %10 €15 €7 €13 €Figure 4.19, The four most common export situations when prices are critically low, showing that,in the observed 5-year period, most of the time, low prices are caused by the internal systems ofWest-DK or/and Northern Germany because of high wind penetration (see 1 and 2). But it alsoshows that sometimes, these prices are formed north of West-DK (melting water in the fall) (datasource: Energinet.dk).4.7. SummaryIn this chapter the impact of wind power on the West-DK power system have been analyzed.It has been shown that although the electricity consumption is more or less constantthroughout the year, the district heat-consumption falls during summer and risesduring winter, and both the electricity and the heat consumption varies within the 24hours of the day – like a camel with one hump in the morning and one around ‘dinnertime’. It has also been shown, that the productions of the electricity does not always fitthe fluctuations of the demand, which is one of the reasons for critical low price hours.Other reasons for electrical overflow and critical low price hours are increased windpenetration, waning electricity demand, cold nights, rain, reduced interconnection capacityand constant central electricity production. We have seen, that most of the periods oflow price hours are caused by internal factors such as increased wind, to which the centralunits does not seem to respond. The reason for this might be found in the difficulties

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