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Munich, Germany

Straub F.,Thuga Ag | Usemann J.,BDEW E.V. | Wetzel B.,Verband Kommunaler Unternehmen E.V.
GWF, Gas - Erdgas | Year: 2010

Within the framework of GABi Gas, the distribution system operators have to administer grid accounts. Grid accounts are the way within the scope of the entire balancing from a network to maintain a compact overview of the balance. The very quick introduction of GABI Gas starting the first of October 2008 together with the extensive demand of the supply ofdata of the grid accounts led to a difficult challenge for the grid operators. During the winter 2009/2010 the substantial high positive power control in gas has been the subject for BDEW and VKU to initiate the project grid accounts analysis. Irrespective of which SLP method (synthetic/analytical ⋯) all gas grid operators in Germany were asked their allocation data of the first 16 months in GABi gas regime to provide analysis. In addition to a standard analysis (SAQ - allocation quality SLP), in which possibly all grid operators should participate, a thoroughly detailed analysis (SIA -intensive analysis SLP) was offered for specially chosen grid areas. During the investigation three essential points of activity were found, in which improvements were seen. This pertains to the customer value calculation and customer value care, the examination of the temperature dependence with the characteristics of the profiles as well as the quality prediction temperature for calculating the allocation. Overall the project confirmed that the recommended SLP calculation procedure and the existing load profiles of the Technical University of Munich with the offered spread in the temperature characteristics are good for the depiction of the gas consumption in Germany. It has been found that a high data quality is of crucial importance in the context of the overall process of the allocation for the quality of the grid account. As a control, it is advisable to make the calculation and mapping of the grid account in the EDM system of the grid operators and keep track of the state of the grid accounts continuously and promptly for failure analysis.

A reliable outlook on the future condition of the networks is of particular importance in times of regulation. To this end it is on the one hand crucial to know about future earnings. On the other hand it is also necessary to reliably predict the physical development of the supply network. Measures which allow a sustainable and stable network state and a long-term manageable cost structure can be taken in time only on the basis of the comparison of both predictions. This is especially true when a high need for replacement is to be expected. By means of a strategic target network planning, based on GIS inventory data and historical fault data, the future network development can be realistically predicted and optimised. The target network planning provides the optimal dimensioning of the network and the renewal planning provides the optimal time of replacement. The combination of both data identifies the future development of the cost structure. Scenario calculations make it possible to quantify the effects of changing basic conditions.

The provision of fire-fighting water is, with the exception of Rheinland-Pfalz, an independent and binding self-governing task of the municipalities on hazard control, which however is often transferred to the water distribution companies. Due to this situation, the questions are consistently what are the related extra costs of the fire-fighting water and how can they be calculated. The present article describes a suitable method for determining the costs for supplying firefighting water. It is based on the analysis of 30 drinking water distribution systems of different sizes and structural characteristics. The evaluation of the results shows that the system related structural constraints and individual company decisions regarding security of supply levels have a strongly influence on the extra costs for fire-fighting water.

Of all the forms of renewable energy, bio-energy is the most suitable for the implementation of CHP and heat-supply concepts at regional and municipal level. The existing natural gas infrastructure can be used for conveyance of conditioned biogas, permitting high energy-effi ciency via a range of utilization routes. The federal government is therefore targeting a biogas grid-injection rate of 60 billion kWh/a by 2020. More than fi fty grid-injection stations employing various technical concepts, and primarily using regenerable-waste substrate, are currently in operation in Germany. Thüga Energie's Kisslegg-Rahmhaus plant is up to now the only German installation using the membrane process. The feed biogas is obtained from biogenic waste, from which around 25 million kWh/a of treated bio-natural gas is generated.

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