Methodology of building a water heater aggregated model for evaluating energy flexibility for domestic hot water
Résumé
Domestic hot water (DHW), due to their connection to the thermal energy storage, can act as an effective tool to gain the flexibility-oriented power system services such as primary frequency control, voltage balancing or power call from the grid. Its flexibility brings balance and stability to the electrical system. Thus, it is important to have an aggregated model, which represents a large number of domestic hot water systems instead of repeating a unit model of only one system. The contribution of this paper consist in developing a methodology to construct an aggregated model representing domestic hot water demand, which is equivalent to a large amount of water heater units. The objective is to assess the energy flexibility. The water heater using an electric resistance element is investigated in order to test the methodology. First, a multi-layer stratified temperature model is built and is simulated. Secondly, the mentioned methodology to provide an aggregated model is developed. Then, the results obtained are presented and show the relevance of the aggregated model behavior for a large amount of hot water heater. These results provide a first building block for the development of an energy consumption flexibility model.
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