Real-time state of charge estimation in thermal storage vessels applied to a smart polygeneration grid

摘要: Abstract In thermal grids and district heating, storage devices play an important role to manage energy demand. Additionally, in smart polygeneration grids, are essential achieve high flexibility demand management at relatively low cost. this scenario, accurate evaluation of state charge vessels based on available measurements is critical. The aim paper develop compare three different models for estimation stratified water tanks (discrete temperature measurements) the related application experimental grid with a real-time tool. first model empirical calculation considering power difference between generation consumption, afterwards correction measured temperatures. second mathematical approach pre-defined shape fitted data. latter 1-D physical using multi-nodal method forced basis were compared test performed laboratory by Thermochemical Power Group (TPG). As result comparative analysis, was selected applications complex due its good compromise accuracy computational effort. Several tests carried out demonstrate performance economic benefit utilization vessel. plant, constituted two prime movers (a 100 kW microturbine 20 kW internal combustion engine) tank, able For reason, special attention devoted variable cost comparisons. novelty work lies development tool coupled simplified modelling approach. This requisite including hundreds or thousands devices. it that such cases required could be difficult obtain. results, produced innovative flexible rig, positive impact as well effective quite simple dispatching Another novel aspect regards assessment both specific 3-h extended conditions typical possible real application.