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As the share of renewable generation increases in electric grids, the traditionally heat driven operation of combined heat and power plants (CHPs) reaches its limits. Thermal storage is required for a flexible operation of CHPs. This work proposes three novel methods to use a heating grid as thermal storage by exploiting its thermal dynamics. These include the first approach proving global optimality, a novel linear formulation of grid dynamics and an easily real world applicable approach.

Electrical engineering --- Fernwärme --- thermische Speicher --- variablenabhängige Verzögerung --- optimale Einsatzplanung --- gemischtganzzahlige Optimierung --- district heating --- thermal storage --- variable dependent time delay --- optimal unit commitment --- mixed integer programming