© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 1 Online simulation of gas distribution networks Peter Aymanns, Stadtwerke Düsseldorf Netz GmbH, Düsseldorf Andreas Stolte, Dirk Wilms, Wolfgang Dörner, PSI AG, Aschaffenburg 9 th SIMONE Congress, October 15-17, 2008, Dubrownik, Croatia

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 2 Contents Introduction Network control at Düsseldorf Cityworks Why online network calculations? System integration Example scenarios Summary

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 3 Network control at Düsseldorf Cityworks Drinking water network 7 pressure zones 1,740 km total length, 73,700 buildings connected 55,369,000 m³/year sales, 212,760 m³/day max. District heating network 3 network sections 183 km total length, 4,950 delivery stations 1.6 GWh sales

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 4 Network control at Düsseldorf Cityworks Electrical power network High, medium and low voltage 9418 km system length, approx. 83,500 buildings connected 4.4 TWh/year sendout; 750 MW peak load Street lightning About 62,000 electric and 17,000 gas lights

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 5 Network control at Düsseldorf Cityworks Gas network High-pressure: 20 bar, 4 bar, medium-pressure 900 mbar, low-pressure 42 mbar 1,456 km total length, approx. 54,100 buildings connected, 121,000 meters 7.0 TWh/year sendout (domestic and commercial), 39.4 GWh/d max. day 4.0 – 5.0 TWh/year power plant gas 9 transfer stations, about 270 gas metering and pressure regulating stations Gas family: Enriched low-BTU gas Pressure regulation, no variation of linepack or storage

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 6 Network control at Düsseldorf Cityworks Combined control center From 2000 merger of the control rooms 2004 to 2005, control centre staff from different sectors were trained together (Simone was used as a training simulator) ‏ Since 2006 staff of the various sectors work interactively

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 7 Combined energies control room of Stadtwerke Düsseldorf

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 8 Why online network calculations? Decision-making tool in the evaluation of complex network operations Planned or unplanned closing of network sections Planned or unplanned closing or partial closing of gas metering and pressure regulating stations Pressure adjustment in the networks Monitoring of load flow

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 9 Why online network calculations? Aims in operational management Review of the supply situation for proposed closures Establish the control variables for controlling Evaluate the impacts of changes in the network switching status Provide information about abnormal conditions in current operations

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 10 Why online network calculations? Why integrated calculation Uniformity for all devisions Reduction of various software applications No interfaces to transfer the dynamic operational data No double data maintenance work Intuitive handling of the calculation within uniform user interface Simple integration of calculation results into operational decisions Available and applicable at all times

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 11 System integration

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 12 Any Data is put in only once Data import from third-party systems Integrated total system, i.e. Highly efficient, faultless data engineering Extreme dynamics Consistent operation and visualization System integration Complete integration Static Data-Models for SCADA, Simulation, Optimization, etc. Shared real-time Database Integrative static Data-Model SCADA-Functions Simulation Optimization etc. Geografic plans Schematic plans Station figures Trend charts Specific figures Lists generator Import from GIS, SAP IS-U MMI OperatingProcess Data

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 13 Any Data is put in only once Data import from third-party systems Integrated total system, i.e. Highly efficient, faultless data engineering Extreme dynamics Consistent operation and visualization System integration Complete integration Static Data-Models for SCADA, Simulation, Optimization, etc. Shared real-time Database Integrative static Data-Model SCADA-Functions Simulation Optimization etc. Geografic plans Schematic plans Station figures Trend charts Specific figures Lists generator Import from GIS, SAP IS-U MMI OperatingProcess Data

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 14 Any Data is put in only once Data import from third-party systems Integrated total system, i.e. Highly efficient, faultless data engineering Extreme dynamics Consistent operation and visualization System integration Complete integration Static Data-Models for SCADA, Simulation, Optimization, etc. Shared real-time Database Integrative static Data-Model SCADA-Functions Simulation Optimization etc. Geografic plans Schematic plans Station figures Trend charts Specific figures Lists generator Import from GIS, SAP IS-U MMI OperatingProcess Data

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 15 Any Data is put in only once Data import from third-party systems Integrated total system, i.e. Highly efficient, faultless data engineering Extreme dynamics Consistent operation and visualization System integration Complete integration Static Data-Models for SCADA, Simulation, Optimization, etc. Shared real-time Database Integrative static Data-Model SCADA-Functions Simulation Optimization etc. Geografic plans Schematic plans Station figures Trend charts Specific figures Lists generator Import from GIS, SAP IS-U MMI OperatingProcess Data

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 16 Any Data is put in only once Data import from third-party systems Integrated total system, i.e. Highly efficient, faultless data engineering Extreme dynamics Consistent operation and visualization System integration Complete integration Static Data-Models for SCADA, Simulation, Optimization, etc. Shared real-time Database Integrative static Data-Model SCADA-Functions Simulation Optimization etc. Geografic plans Schematic plans Station figures Trend charts Specific figures Lists generator Import from GIS, SAP IS-U MMI OperatingProcess Data

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 17 System integration Common data handling All data stored in control system database - topology - technical data - figures Import of GIS data - cyclic incremental into control system database - objects keep their identity - pipes and network equipment - generation of geographic oriented figures Import of consumption data - cyclic incremental into control system database - annual consumptions from billing system

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 18 System integration Applications State estimation - adaption of the load model - calibration tool - determines current flow conditions in the network - information on locations without measurement is available

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 19 System integration Applications State estimation - adaption of the load model - calibration tool - determines current flow conditions in the network - information on locations without measurement is available Look ahead simulation - check network behaviour before a operation is carried out - determines network status for future load and switching szenarios - load forecasts and nominations are considered - improvement of operation mode

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 20 System integration Visualisation Indication - display of measured and/or calculated values - indication of discrepancies - indication of alarms Coloured network diagrams - flow - pressure - velocity - lots of others (diameter, subnet, age...) Flow arrows Bubble help for object informations Curves

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 21 Example scenarios Checking the supply status before taking the GDR station C78 out of service.

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 22 Initial flow status Example scenario: station C78 taken out of service

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 23 Flows - C78 out of service Example scenario: station C78 taken out of service reverse flow zero flow to C78

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 24 Pressures - C78 out of service Example scenario: station C78 taken out of service

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 25 Initial pressures Example scenario: station C78 taken out of service

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 26 Lp pressures - C78 out of service Example scenario: station C78 taken out of service

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 27 Example scenarios Determining the effects of closing hp valve SBN 778 SBN 778

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 28 Initial flow status Example scenario: closing hp valve SBN 778 SBN 778 B 6 B 8 B 7

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 29 Flows - SBN 778 closed Example scenario: closing hp valve SBN 778 SBN 778 B 6 B 8 B 7

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 30 Initial Feeding Example scenario: closing hp valve SBN 778 Feeding - SBN 778 closed

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 31 Velocities - SBN 778 closed Example scenario: closing hp valve SBN 778 SBN 778 Increased velocity B 6 B 7

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 32 24/7 Netze GmbH, Mannheim - quasi steady state district heating calculations - instationary / transient gas network calculations Stadtwerke Düsseldorf Netz GmbH, Düsseldorf - steady state gas network calculations - quasi steady state drinking water network calculations - quasi steady state district heating calculations Stadtwerke Duisburg Netzgesellschaft mbH, Duisburg - steady state gas network calculations - steady state drinking water network calculations NRM Netzdienste Rhein-Main GmbH, Frankfurt - instationary / transient gas network calculations HEAG Südhessische Energie AG, Darmstadt - steady state gas network calculations SWM Infrastruktur GmbH, München - instationary / transient gas network calculations E.ON Avacon Netz GmbH, Braunschweig - instationary / transient gas network calculations Stadtwerke Aachen AG, Aachen - steady state gas network calculations - steady state drinking water network calculations - quasi steady state district heating calculations References

© PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 33 Assists operators of distribution networks State estimation calculates actual flow situation Look ahead simulation to test operations in advance Modular software design Different computing cores available Uniform data model Use of GIS data and consumption data Uniform user interface Easy to use simulation functions Powerful visualisation Summary Integrated online network calculations