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

6 Introductionthe problem will become when increasing the wind production share to 50 %. Furtheranalyses are therefore needed in order to gain insight into the potential impacts on priceformations, production patterns, system economy and environmental issues.A high wind production is not always exclusively the factor causing critically low prices.Factors such as heat demand, hour of the day, varying transmission capacities etc. canplay a part as well. In order to better understand which significant factors affect theprobability of the formation of critically low prices, a further statistical study will benecessary.A rather price-inelastic consumption of heat and electricity imposes a great challenge toa successful integration of large amounts of fluctuating wind power in the Danish energysystem. Aside from power storage (which currently is at a relatively immature technologicalstage), there are three basic solutions to this challenge. One is to improve the externaltransmission. The second is to promote a more flexible and elastic consumption. Athird solution is to reduce the amount of constrained power generation from CHP unitsvia a more flexible production. When discussing short term feasibility, heat pumps seemas an obvious technology (Energinet.dk 2009) that can both increase the electricity consumptionas well as replace CHP production. Another potential instrument (currentlybeing at a more theoretical stage) is called turbine bypass. The concept of turbine bypassis to lead the steam around the high-pressure turbine on central power plants with CHP,and use it directly for heat production, thus transforming the plant into a heat producer.However, the potential of these instruments is still unknown, and need to be analyzed.In a liberalized electricity market like the Danish almost every choice is based on economicconsiderations, and various economic and technical aspects have to be paid attentionto before introducing drastic changes to the energy system. Since “A Visionary DanishEnergy Policy” (2007) many potential solutions for an optimal integration of 50 %wind power have been suggested. However, the economic consequences of increased windcapacity are to some extend still unknown. A mathematical optimization model is thereforeneeded for gaining the necessary insight into the economic impacts of the increasedwind power, as well as the potential effects of applying instruments for a more flexibleproduction and consumption of heat and electricity.1.2. ObjectivesBased on the described future challenges entailed by the integration of 50 % wind powerin the Danish energy system, as well as the potential solutions to resist these, thisproject aims at fulfilling the following three main objectives, of which the latter is consideredthe primary objective.1. Identification of the main characteristics of the West Danish power- and heatsystem including a statistical analysis of the factors causing critically low priceswith focus on the effect of wind power.2. The development of a mathematical model of an energy system with characteristicssimilar to the West Danish heat and power system for optimization of the totalsystem costs.

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