The article presents the possibility of replacing the gross calorific value measurements for the individual exit points with simulation result verified by the measurements of reference gas. The results of simulation are used for transport and balancing settlement purposes and optimization of market based system services used for ensuring integrity of system.The paper describes the work related to the research of the methodology on the artificial network in order to check the functioning of the model. Subsequently it presents the results obtained after the implementation of this methodology in the Polish gas transmission system.


As a result of regulations arising from the development of a competitive market for natural gas, the gas divisions of large enterprises were made. The existing large gas companies operating on the individual countries markets were divided into companies related to technical infrastructure and companies dealing with natural gas trading. The infrastructure operators are now called respectively the transmission system, distribution system and storage system operators. The principles of their functioning and relationships with traders are regulated by the European Union rules and the national ones.

The developing liberalized gas market results in a rapid increase in the gas trading competition. Due to the uses of gas as an energy carrier the companies involved in gas trading are interested in providing a certain amount of energy, not the volume of gas. It causes the situation that the distribution and transmission system operators are inclined to execute the gas transmission contracts accounted in energy units.

Natural gas is a raw material for the chemical industry as well as an energy carrier. Gas is transmitted from the source to the customer installation by the pipeline network. Despite the same name "natural gas", its composition and resulting from it the physical and chemical parameters are different and depend on source types they are extracted from. Until recently, the transmission and distribution systems were associated with individual source of very similar gas quality parameters. The system supplied from Siberian or Caucasian sources practically had no connections with the system supplied form the North Sea source. The significantly different gas quality system had the special installation (blending station), in which the components proportions were under the operators control. Currently as a result of the intensive development of the liberalized European gas market and transmission infrastructure, the operators face many challenges associated with increasing requirements concerning the execution and settlement of natural gas transmission services.

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