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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 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, AGA8DC92, GERG2008 as well as additional custom equations. Furthermore, the gas model contains a number of options for computing the friction factor in the pressure drop equation such as Hofer, Zanke, Nikuradze and Colebrook-White equation.
In addition, gas networks can be simulated with gas quality, composition & temperature tracking.
The simulation models for electricity networks are based on steady state alternating currents (AC). Electric 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 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 at gas fired power plants, power-to-gas facilities, electric driven gas compressor stations and LNG terminals. The resulting system of equations are solved simultaneously for each simulation time step.
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.
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SAInt can be used to answer the following types of questions:
SAInt allows the user to model different energy systems in a single integrated simulation environment and graphical user interface.
The combined modeling of natural gas and electricity networks is the most unique feature of SAInt.
The equations describing the natural gas and electricity systems 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 time step.
The coupling between both vectors includes:
The current version of SAInt models real large-scale natural gas and electricity networks, independently or in a coupled way.
It includes two gas network modeling approaches:
and two electric network modeling approaches:
The gas and electricity network models can be combined to run the following simulation models: