Download - © PSI AG, Stadtwerke Düsseldorf GmbH 2008 SimoneCongress 2008, sheet 1 Online simulation of gas distribution networks Peter Aymanns, Stadtwerke Düsseldorf.

© PSI AG, Stadtwerke Düsseldorf GmbH 2008

SimoneCongress 2008, sheet 1

Online simulation of gas distribution networks

Peter Aymanns, Stadtwerke Düsseldorf Netz GmbH, DüsseldorfAndreas Stolte, Dirk Wilms, Wolfgang Dörner, PSI AG, Aschaffenburg

9th SIMONE Congress, October 15-17, 2008, Dubrownik, Croatia



Contents

Introduction

Network control at Düsseldorf Cityworks

Why online network calculations?

System integration

Example scenarios

Summary




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




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




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 meteringand pressure regulating stations

Gas family: Enriched low-BTU gas

Pressure regulation, no variationof linepack or storage




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


SimoneCongress 2008, sheet 7 Combined energies control room of Stadtwerke Düsseldorf




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




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




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



System integration



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-Modelsfor SCADA, Simulation,

Optimization,etc.

Sharedreal-timeDatabase

Integrativestatic

Data-Model

SCADA-Functions

SimulationOptimization

etc.

Geografic plans

Schematic plans

Station figures

Trend charts

Specific figures

Lists

generator

Import from GIS,SAP IS-U MMI Operating Process Data






System integration



Optimization,etc.


Integrativestatic

Data-Model

SCADA-Functions


etc.

Geografic plans

Schematic plans

Station figures

Trend charts

Specific figures

Lists

generator







System integration



Optimization,etc.


Integrativestatic

Data-Model

SCADA-Functions


etc.

Geografic plans

Schematic plans

Station figures

Trend charts

Specific figures

Lists

generator







System integration



Optimization,etc.


Integrativestatic

Data-Model

SCADA-Functions


etc.

Geografic plans

Schematic plans

Station figures

Trend charts

Specific figures

Lists

generator







System integration



Optimization,etc.


Integrativestatic

Data-Model

SCADA-Functions


etc.

Geografic plans

Schematic plans

Station figures

Trend charts

Specific figures

Lists

generator




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



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



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



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



Example scenarios

Checking the supply status before taking

the GDR station C78 out of service.



Initial flow status

Example scenario: station C78 taken out of service



Flows - C78 out of service


reverse flowzero flow to C78



Pressures - C78 out of service




Initial pressures




Lp pressures - C78 out of service




Example scenarios

Determining the effects of

closing hp valve SBN 778

SBN 778



Initial flow status

Example scenario: closing hp valve SBN 778

SBN 778

B 6

B 8

B 7



Flows - SBN 778 closed


SBN 778

B 6

B 8

B 7



Initial Feeding


Feeding - SBN 778 closed



Velocities - SBN 778 closed


SBN 778

Increased velocity

B 6

B 7



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



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