Using heat pump energy storages in the power grid

Using heat pump energy storages in the power grid,10.1109/CCA.2011.6044504,T. S. Pedersen,P. Andersen,K. M. Nielsen,H. L. Starmose,P. D. Pedersen

Using heat pump energy storages in the power grid  
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The extensive growth of installed wind energy plants lead to increasing balancing problems in the power grid due to the nature of wind fields and diurnal variations in consumption. One way to overcome these problems is to move consumption to times where wind power otherwise cause overproduction and large fluctuations in prices. The paper presents a method which takes advantage of heat capacity in single-family houses using heat pumps which are anticipated to be installed in large numbers in Denmark in next decade. This type of heating gives a large time constant and it is shown possible to move consumption without compromising the comfort of house residents. In the paper an optimization exploiting forecasts of weather and energy prices combined with prediction models of house dynamics is presented. The results show that with the presented method it will be possible to move a substantial amount of energy from one time to another. I. INTRODUCTION In recent years problems with balancing electricity supply and demand in the grid has emerged in Denmark. The problem is mainly due to the large and fluctuating power production from wind turbines. This problem will grow in the near future due to an increased number of wind turbines. In Denmark at present wind power meets 20 % of the electricity demand, however this covers variation from a minimum of 2-3 % to peaks more than 100 % of the instantaneous power demand. In (1) it is estimated that the wind energy percentage will rise to 67 % in 2030.
Conference: IEEE Conference on Control Applications - CCA , pp. 1106-1111, 2011
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