Electric grid and heat planning scenarios with centralised and distributedsources of conventional, CHP and wind generation

This paper defines two electric grids for the area of Jutland in Denmark, n amely the existing grid versus a "nature protection grid", in which all 400 kV AC overhead lines are replaced by 150 kV lines. According to official D anish policies for laying underground cables, such a replacement makes it e conomically feasible on a long-term basis to replace all overhead lines wit h underground cables. The two grids are then tested against different energ y demand and supply systems in a load-flow analysis. It is found that the " nature protection grid" is well suited for the implementation of sustainabl e energy systems exploiting both CHP and renewable energy sources such as w ind power if certain strategies for the technical regulation of decentralis ed CHP units are used. (C) 2000 Elsevier Science Ltd. All rights reserved.