Research

Abstract

Of relevance to the present situation of draining resources are offshore wind parks due to higher averages of wind speed at sea. Nevertheless, unsteadiness of wind requires an intelligent power plant management onshore which is costly because of wind fluctuation inside power grid, adversarial electric main utilisation and electrical overstress in power grid. Therefore, a combined offshore power plant consisting of wind park, cavern storage, gas reservoirs, fallow-gas power generation, and gas-fired power plants has been investigated what allows the generation of base load power largely from renewable energy sources offshore.

For instance, some results are that heating and cooling of compressed air by cyclic storing can be assumed with ΔT/Δp = 1.3°C/bar, or that from a geological point of view three combined salt domes (Borkum, Lisa and Lollo) in the north of Borkum seemed to be suitable for compressed air energy storages because they are built of Zechstein salt. Moreover, a thermodynamical model of cavern storage for compressed air has been developed to evaluate its behaviour under real performance data. Beyond that, offshore electrification of fallow-gas offshore can create new possibilities when gas with low calorific value could not be used hitherto. By integration of different parts into an offshore power plant, stability of offshore grids is increased with synchronous machines particularly with reference to HVDC connection. From an economic point of view, power initial cost of a combined offshore power plant have much lower external diseconomies than a usual base load power plant. Depending on interest loan, “true initial cost“ in the amount of nine to eleven Cent per kilowatt hour are expected. Owing to this, the Clausthal Concept is on a level with brown coal power stations and thus competitive. The next step to be taken is to put it into practice.

 

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