SAInt Software

SAInt (Scenario Analysis Interface for Energy Systems) is a software application for planning, analysing and operating independent or interconnected natural gas and electric power system networks simultaneously and in a single simulation framework.

SAInt can be used as a standalone gas network simulator, as a standalone power system simulator, as a gas and power system co-simulator or as a combined single time frame gas and power system simulator.

SAInt enables the user to model and analyse gas and electricity networks in a single Graphical User Interface (GUI) and a single simulation environment, therefore, avoiding time consuming and inaccurate iterative data exchanges between two structurally separated simulation environments.

SAInt can be interfaced to external applications, such as Matlab, MS Excel, MS Visual Studio or other existing Energy Systems Management tools to automate modelling and simulation processes or to establish a co-simulation platform using SAInt's standalone gas or power system solvers.

SAInt has been successfully validated against industry standard software applications and real time network data.


Areas of Application

  1. Planning and operational studies of independent or coupled gas and electric networks.
  2. Monte Carlo simulations of independent or coupled gas and electric networks.
  3. "What if?" scenario analysis to study the impact on security of supply.
  4. Survival time and restoration simulation of critical scenarios to study the impact on resiliency.
  5. Analysis of the effectiveness of strategies and policies to mitigate the impact of disruptions.
  6. Line-pack management of coupled gas and electric networks.
  7. Scheduling of LNG vessel arrivals to LNG regasification terminals.
  8. Modeling the flexibility a gas system can provide to a power system.
  9. Analysis of the coordination between gas and power transmission system operators (TSOs).

Questions SAInt can answer

  1. What are the impacts of natural gas network constraints on power system operations?
  2. What is the value of coordinating electricity and natural gas network operations?
  3. What are the impacts of power to gas on electricity and gas network operations?
  4. What are the impacts of an extreme weather event or of a gas network (or electricity network) contingency on the reliable operation of both critical energy infrastructures?
  5. What are the impacts of new federal or state policies on the operation of both systems?

Gas Network Simulation

The gas network simulation models in SAInt are based on the one-dimensional continuity, momentum, energy, and state equations, derived from the laws of conservation of mass, momentum and energy and the real gas law. The gas compressibility is taken into account through an equation for the compressibility factor. The available equations for computing the gas compressibility include Papay,  AGA, AGA8DC92GERG2008 as well as additional custom equations. Furthermore, the gas model contains a number of options for computing the friction factor for pipelines such as the Hofer, Zanke, Nikuradze and Colebrook-White equation. In addition, gas networks can be simulated with gas quality, composition and temperature tracking.

The following standalone gas network simulation models are available:

  1. Steady State Gas Network Simulation with Gas Quality, Composition and Temperature Tracking
  2. Quasi-Dynamic Gas Network Simulation with Gas Quality, Composition and Temperature Tracking
  3. Dynamic Gas Network Simulation with Gas Quality, Composition and Temperature Tracking 

Electric Network Simulation

The simulation models for electricity networks are based on steady state alternating currents (AC). Transmission lines and transformers are modeled by a unified pi-circuit model, while generation units and loads are modeled at buses. Time transitional constraints of generation units, such as start-up and shut down times as well as maximum ramp rates are considered.

The following standalone electricity network simulation models are available:

  1. Steady State AC-Power Flow Simulation with distributed Slack Bus Model
  2. Steady State AC-Optimal Power Flow Simulation
  3. Quasi-Dynamic AC-Power Flow Simulation with distributed Slack Bus Model
  4. Quasi-Dynamic AC-Optimal Power Flow Simulation

Combined Simulation

The combined simulation of gas and electricity networks is one of the unique model features of SAInt. In a combined simulation, the equations describing the gas and electricity system are linked through a number of coupling equations reflecting the physical interlink between the two energy vectors. The resulting system of equations are solved simultaneously for each simulation time step. The coupling between both vectors includes:

  • the gas offtake from gas networks to generate electricity in gas fired power plants connected to electricity networks,
  • the power offtake from electric networks to generate hydrogen and/or synthetic natural gas in power to gas facilities and the injection of the generated gas into gas pipeline networks as well as the blending and tracking of changes in gas composition and gas qualities downstream.
  • the power offtake from electric networks to operate electric driven gas compressor stations and underground gas storage facilities
  • the power offtake from electric networks to operate storage tanks and low and high pressure pumps in LNG regasification terminals.

One of the most powerful features of the combined simulation model is its ability to define conditional control changes, which may include state information of both energy vectors. For instance, the startup and shutdown of a gas fired power plant in the electric network, which depend on the available gas pressure and linepack in the gas network, can be modelled realistically by conditional expressions.

The following combined gas and electricity network simulation models are available:

  1. Combined Steady Gas and Steady AC-Power Flow Simulation
  2. Combined Steady Gas and Steady AC-Optimal Power Flow Simulation
  3. Combined Dynamic Gas and Quasi-Dynamic AC-Power Flow Simulation
  4. Combined Dynamic Gas and Quasi-Dynamic AC-Optimal Power Flow Simulation

SAInt Publications

  1. K. A. Pambour, "Modelling, simulation and analysis of security of supply scenarios in integrated gas and electricity transmission networks," PhD dissertation, University of Groningen, 2018.
  2. K. A. Pambour, R. T. Sopgwi, B.-M. Hodge and C. Brancucci, "The value of day-ahead coordination of power and natural gas network operations," in Energies, vol. 11, no. 7, pp. 1628, 2018.
  3. K. A. Pambour, B. Cakir Erdener, R. Bolado-Lavin, and G. P. Dijkema, "SAInt - A novel quasi-dynamic Model for assessing Security of Supply in coupled Gas and Electricity Transmission Networks," in Applied Energy, vol. 203, pp. 829 - 857, 2017.
  4. K. A. Pambour, B. Cakir Erdener, R. Bolado-Lavin, and G. P. Dijkema, "Development of a simulation framework for analyzing security of supply in integrated gas and electric power systems," in Applied Sciences, vol. 7, no. 1, pp. 47, 2017.
  5. K. A. Pambour, R. Bolado-Lavin, and G. P. Dijkema, "An integrated transient Model for simulating the Operation of Natural Gas Transport Systems," in Journal of Natural Gas Science and Engineering, vol. 28, pp. 672 - 690, 2016.
  6. K. A. Pambour, B. Cakir Erdener, R. Bolado-Lavin, and G. P. J. Dijkema, "An integrated Simulation Tool for analyzing the Operation and Interdependency of Gas and Electric Power Systems," in Pipeline Simulation Interest Group (PSIG) Conference 2016.
  7. K. A. Pambour, R. Bolado-Lavin, and G. P. Dijkema, "SAInt - A similation Tool for analyzing the consequences of Natural Gas Supply Disruptions,"  in Pipeline Technology Conference (PTC) 2016.
  8. B. Cakir Erdener, K. A. Pambour and R. Bolado-Lavin, "Interdependencies between Natural Gas and Power - Development of a Strategy for Modelling Interdependencies", European Union - JRC Science Hub, 2015.
  9. B. Cakir Erdener, K. A. Pambour and R. Bolado-Lavin, "Interdependencies between Natural Gas and Power - Scenario Analysis and Recommendations to Member States", European Union - JRC Science Hub, 2015.

SAInt Demo


Release History

01. July 2019

SAInt Software 2.0

  • Newly designed graphical user interface including:
    • New Ribbon bar has replaced menu strip and tool strip in previous version
    • New Application Menu for managing sessions and for loading recent files
    • New Docking and Floating functionality for windows gives the user more flexibility to customize windows layout
    • New Project Explorer for managing project files
    • New Model Explorer with detailed hierarchical view of all loaded objects and filtering capability
    • New Map window for plotting networks in different views and in multiple maps
    • New Workspace window for viewing defined functions and variables
    • New Tables with features for grouping, filtering and searching for strings in columns and for displaying aggregated values for numerical columns. Exporting table content to CSV, MS Excel, HTML and PDF have also been added
    • New Property Window with hierarchical view of collections
    • New Log Window with filtering capability
  • New network editing capability added which allows user to add, remove and disconnect elements as well as join disconnected nodes
  • Content of network files has been reduced and label, vertices and polygon data are saved in separate files *.lbl, *.vtc and *.plg, respectively
  • All label, vertices and polygon files can be exported and included
  • Intervalls of Color Legends in Map window can be customized by the user as well as the displayed unit
  • Objects can have multiple labels and multiple background labels can be added to each network
  • Selection in map can be filtered by different object types through checkbox legend
  • Gas quality and temperature tracking added for steady state and dynamic gas network simulation as well as for coupled gas-electric simulation (upgrade license needed, trial licenses available)
  • Gas qualities and components can be imported from a text file, exported to a *.qual file and included as a *.qual file.
  • AGA8DC92, GERG2008 equations for computing gas compressibility factor added
  • Multiple functions added for API calls from unmanaged programming languages (Python, C etc.)

01. January 2019

SAInt Software 1.2.1.2

  • Export of selected subnetworks to a network file enabled
  • Properties added to net objects for comparing results from previous run through profile assignment
  • command line options for SAInt-Batch extended by following options:
    • -ignet filename-> specifies the filepath to the network import file for creating a new gas network file. Gas network file will be saved in the same directory as the import file and the filename of the network is the same at the import filename with the exception of the file extension.
    • -ienet filename -> specifies the filepath to the network import file for creating a new gas network file. Electric network file will be saved in the same directory as the import file and the filename of the network is the same at the import filename with the exception of the file extension.
    • -pgnet filename -> specifies the filepath to the parameter import file for updating the input parameters of the gas network model currently loaded with command option -gnet. Make sure gas network file is loaded before importing parameter.
    • -penet filename -> specifies the filepath to the parameter import file for updating the input parameters of the electric network model currently loaded with command option -enet. Make sure electric network file is loaded before importing parameter.
    • -ngsce ScenarioName ScenarioType StartTime EndTime TimeStep -> Create new gas scenario for loaded gas network model
    • -nesce ScenarioName ScenarioType StartTime EndTime TimeStep -> Create new electric scenario for loaded electric network model
    • -igsce filename ->Import scenario import file to loaded gas scenario model
    • -iesce filename ->Import scenario import file to loaded electric scenario model
    • -igprf filename ->Import profile import file to loaded gas scenario model.
    • -ieprf filename ->Import profile import file to loaded electric scenario model.
    • -gsol output description file output file ->generates time series of specified outputs in output description file and saves it into output file using the predefined file path set with batch options -gnet, -gsce.
    • -esol output description file output file ->generates time series of specified outputs in output description file and saves it into output file using the predefined file path set with batch options -enet, -esce.
  • Parameter import allows import of network parameters and not only net object parameters, thus parameters like gas properties, reference conditions etc. can be updated through parameter import

30. June 2018

SAInt Software 1.2.1.1

  • Maximum and minimum active power generation capacity (PGCMAX, PGCMIN) added as property to ENET
  • Background images can be added and positioned in map using the property editor
  • Project folder can be opened from property editor of corresponding network
  • Images (*.bmp, *.png,*.jpg etc) can be added to labels and rendered together with labelinfo. All images a saved in folder Images located in the same folder as the network file
  • Networks can be assigned a label. Network labels are rendered on a fixed location in map. Labelinfo for Network labels requires specification of ObjectType.Name.Extension
  • Bus types can be changed in GUI in network mode
  • Electric loads and loads originating from the coupling between gas and electric system (power supply to compressor station, LNG Terminal, UGS facilities etc.) can be assigned a power factor instead of defining a reactive power demand set point (QDSET), however, definition of QDSET in scenario table has priority over power factor definition
  • New properties PWRF (power factor for local electric loads) and PWRFGAS (power factor for gas system loads) added to electric bus
  • Reactive power demand set point (QDSET) and reactive power demand from the gas system (QDGAS) have been added as properties to electric buses
  • Heat rate curve, cost function, and reactive power capability curves of generation unit can be plotted using the property editor. Plots include operating points of each generator.
  • Console application SAInt-Batch for time intensive simulation is now available but requires additional licenses for accessing SAInt-API. All simulation modules available in SAInt ( SteadyGas, DynamicGas, CombinedDynamicGasQuasiDynamicACOPF Simulation etc.) can be called from a batch file or from the windows command line without using the GUI. SAInt-Batch can also be called from the SAInt command window. Results obtained from SAInt-Batch can be viewed in SAInt-GUI.

Next Software Update:

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Office Germany:
encoord GmbH
Am Waldthausenpark 9
45127 Essen
Germany

Telephone:
(+49) 201 433 950 39

Email:
info@encoord.com

Managing Director:
Dr. Kwabena Pambour

Office USA:
encoord, LLC
Greater Denver Area
Edgewater, CO 80214
United States

Telephone:
(+1) 720 418 1843

Email:
info@encoord.com

Managing Director:
Dr. Carlo Brancucci

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