Calorific Value Reconstruction in Grid Levels 2 and 3

Biomethane belongs in the grid!

With the integration of renewable gases, the decentralized feed-in of biomethane and hydrogen and thus different gas qualities into the gas grid will increase. With inGRID - the interactive feed-in map for renewable gases - we have made it transparent where biomethane can be fed into the gas grid most efficiently.

With the increasingly decentralized feed-in of renewable gases, it is also becoming more and more important to be able to track exactly how high the calorific value of the transported gas is at certain transfer and withdrawal points.

AGGM and the gas network operators are setting the course for the integration of renewable gases and will put systems for calorific value tracking into operation on January 1, 2024. These systems will make it possible to determine the exact calorific value for each extraction point in the gas network. In accordance with the provisions of the Gas System Charges Ordinance, these calorific values will also be used to determine the amount of energy in end customer bills from 1 January 2024. Based on the applicable technical rules of ÖVGW guideline G O 110, tapping points will be grouped into calorific value districts. In future, the actual calorific values and the calorific value districts will also be published on the AGGM website.

AGGM has been calculating calorific values for distribution system operators at grid level 1 in the Austrian gas grid since January 1, 2023. Together with two distribution system operators, AGGM has now also implemented a calorific value determination system for network levels 2 and 3 of these network operators.

Both projects essentially consisted of the following milestones:

Implementation of a complete GIS network model down to the individual household connections with corresponding derivation of a simulation model. Development of proposals for optimizing the network model.
Coordination of the data exchange
Establishment of data monitoring of the input data
Adaptation of the established level 1 simulation process to the boundary conditions of network levels 2 and 3, including the creation of separate IT modules for each customer
Development of an automated plausibility check for results data
Implementation, application and testing of the mean value method in accordance with ÖVGW guideline G O 110 for network components with multiple feeds

The implemented process steps, which can also be rolled out to other distribution grids, can be shown schematically as follows:

Both customer projects were quite challenging in terms of technology and, in particular, the time frame. Together with the project partners, a great deal of development work was invested to ensure that the high-quality data was available as the result of an automated simulation process in time for January 1, 2024.

AGGM Austrian Gas Grid
Management AG
Peak Vienna
Floridsdorfer Hauptstraße 1
1210 Vienna, Austria

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