System for Real Time Managing the Natural Gas Transport Network
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Sorin Neacșu and Cristian Eparu
Petroleum - Gas University of Ploiești, Romania
Volume 2013 (2013), Article ID 609334, Journal of Eastern Europe Research in Business and Economics, 9 pages, DOI: 10.5171/2013.609334
Received date : 23 April 2013; Accepted date : 8 July 2013; Published date : 29 October 2013
Academic editor: Necula Sabina-Cristiana
Cite this Article as: Sorin Neacșu and Cristian Eparu (2013), "System for Real Time Managing the Natural Gas Transport Network," Journal of Eastern Europe Research in Business and Economics, Vol. 2013 (2013), Article ID 609334, DOI: 10.5171/2013.609334
Copyright © 2013. Sorin Neacșu and Cristian Eparu. Distributed under Creative Commons CC-BY 3.0
Keywords: gas, transport, program, platform
The operation of a natural gas transportation system requires real-time information collected from the entry / exit points and from the technological nodes, and this can be achieved by using SCADA type systems. The interpretation of such information, essential in the process of decision making, is processed by software which performs rapid balance calculations on the transportation network providing a near real-time representation of both the transported gas flow and the main transportation parameters.
According to Neacșu and Eparu (2012), for the data on the basis of which decisions are made to be accurate, the numerical simulator that processes these data should be based on a properly calibrated model of the transportation network and, if possible, it should have certifications attesting the accuracy of the results. In Europe, the most often used numerical simulator of natural gas transportation is SIMONE.
Using this type of infrastructure consisting of SCADA + numerical simulator, Eparu et al., (2011) showed that the dispatcher can simulate any manoeuvre that is to be performed later on, or he/she can plan the transportation schedule for the forthcoming day based on the current day balance values, and also on the customer requirements collected in the nominations.
For larger transportation systems, like the one in Romania that covers over 13.000 km with more than 1.000 exit points and 130 entry points, Neacșu and Eparu (2012) emphasized that the planning of the schedule for the following day becomes difficult because of the large amount of data that must be handled in a short period of time. To overcome such difficulties, it is necessary to design an IT platform useful for the dispatcher to plan the following day schedule or to simulate various manoeuvres.
In this paper we shall present the concept of such a computing platform, a platform that is currently being developed at Transgaz SA, the company in charge with the national gas transportation system in Romania.
The Use of Simone for Simulations on a Gas Transport Network
The Simone simulator is the main engine performing both real-time interpretations of the data collected by the SCADA system as well as simulations. Simone is a numerical simulator that allows the calculation of gas flows and other related quantities using the network transportation graph. Simulations can be performed on line, using data from SCADA, or off line when aimed to plan the transportation programme or to find solutions for various situations.
Figure 1 shows the result of a specific simulation performed on the gas transportation system. The pressure fluctuation within the gas network is highlighted in this image by means of a colour code, as underlined by Neacșu and Eparu (2012).
Checking the charging of the exit points based on consumer profiles
According to ANRE (2013), ENTSOG (2010), ERGEG (2010), exit flows within the transmission system shall be assessed on the basis of daily nominations of the gas volumes required by customers. These flows are checked by taking into consideration the consumer profiles for each exit point to see the degree of request. Without these checks, there is a risk for the customers to use the gas quantities taken in daily as a short term loan since payments are made on a monthly basis.
Fig 3: Consumption profile
Profiles for an exit point feature a variable component depending on temperature, as illustrated in Figure 3, a calibration depending on the day of the week and a daily variable consumption factor, forecasted on the basis of previous day’s consumption values that outline the consumer behaviour proper to each customer, as depicted in Figure 4.
within a gas year
Presenting the Concept of the Operating Platform Within the Transportation System
Figure 6 depicts the structure of the operating platform and the information flow. The main aim of this platform is both to facilitate the work of the dispatchers when planning the forthcoming day’s schedule, and also to provide the dispatcher with a reliable and fast device that enables the simulation of commands in cases of emergency. Hence, the dispatcher can quickly overview the outcomes of the commands and is thus able to make the best decisions.
After prescribing new values, the operator can command a simulation and can overview the resulting values. He/she will repeat this procedure until the desired results are achieved. By this time the platform has completed the list of operating manoeuvres required for the forthcoming day. These can be programmed within SCADA the following day. A sample list is shown in Figure 8.
Besides facilitating the work of the dispatcher, the platform will be equipped with learning software designed to perform operating procedures and solve critical situations.
Based on this informatics platform, standard operating procedures for handling emergency situations can be performed. The dispatcher will always receive competent care for each manoeuvre.
The computing platform presented in this paper, along with the SCADA system, is being currently implemented at Transgaz SA, the company that manages the natural gas transportation system in Romania.
In order for this platform to be completed, it was necessary to design the basic elements. Thus, several applications have been developed: a computer model for the transportation network designed for the Simone simulator, a software module designed for calculating the capacity specific to all exit points along the National Transportation System and a software module designed for calculating the consumption profiles at the National Transportation System’s exit points, and also the generating of gas-flow forecasts observed in different directions.
An integration module for SCADA, as well as a module designed to automatically perform simulations are currently in progress. Eventually, all these modules will be integrated in the computing platform. Due to the particularities of the data used for the simulations we opted for a specific database.
ENTSOG, (2010), ‘ENTSOG Web Survey on Capacity Products and Allocation Methods Analysis Report,’ CAP010-10,http://www.gie.eu.com/memberarea/purtext_entsog_congestion.asp?wa=plus_congestion
ERGEG, (2010), ‘Capacity Allocation on European Gas Transmission Networks. Pilot Framework Guideline,’ Ref: E10-GWG-66-03, http://www.energy-regulators.eu/portal/page/portal/EER_HOME/EER_ACTIVITIES/ Input_to_Framework_Guidelines/Gas/Capacity%20Allocation%20Management/Overview/E10-GWG-66-03.pdf
Eparu, C., Neacşu, S., Albulescu, M. and Rădulescu, R. (2011), ‘Considerații privind simularea dinamicii fluxurilor de gaze naturale în sistemele de transport,’ Termotehnica Revue, XV (1), 17-24
Neacșu, S. and Eparu, C. (2012), ‘Presentation of some aspects related to the use of SIMONE in modelling the gas transport network in Romania,’ 11th SIMONE Congress, 13–15 June 2012, Bratislava, Slovakia, 05
Simone 5.7, http://www.simone.eu/simone-company-about.asp