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The Reference for TRANSIENTS In POWER SYSTEMS |
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EMTP-RV Computational Engine |
EMTP-RV is the end result of the "EMTP
Restructuring project" undertaken by the DCG in 1998 for
modernizing the EMTP96 software. EMTP-RV is the enhanced
computational engine and EMTPWorks its new graphical user
interface (GUI). The package is a sophisticated computer program
for the simulation of electromagnetic, electromechanical and
control systems transients in multiphase electric power systems.
It features a wide variety of modeling capabilities encompassing
electromagnetic and electromechanical oscillations ranging in
duration from microseconds to seconds. Examples of its use include
switching and lightning surge analysis, insulation coordination,
shaft torsional oscillations, ferroresonance and power electronics
applications in power systems.
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Features: |
- Written from scratch using mostly Fortran-95 in
Microsoft Visual Studio environment
- Object-oriented based programming methods
- Designed for very fast computation with fully
dynamic and case-tailored memory usage
- New sparse matrix based formulation of network
equations capable of handling very large cases,
eliminating topological limitations and providing a
plugin model interface
- Significantly improved solution method for nonlinear
models: provides very fast convergence, no topological
restriction
- Open architecture coding that allows users customization
and userside implementation of sophisticated models
- Major improvements in the simulation of control systems
New approach with built-in
models and encapsulation
Better ordering techniques
Optional iterative solver for precisions and
user-defined modeling options
- New steady-state solution with harmonics
- New three-phase load-flow
- Automatic initialization from steady-state solution
- New capability for solving detailed semiconductor
models
- Simultaneous switching options for power electronics
applications
- Code structure designed to be expandable to
specialized toolboxes
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| A transient stability
case study |
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| User defined load model
form |
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Series capacitor subnetwork |
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Series capacitor subnetwork Example of signals drawn by
Scopeview |
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Architecture |
EMTP-RV computational engine is driven by EMTPWorks.
The bulk data transmission from EMTPWorks to EMTP-RV is
performed using a Netlist file. EMTP-RV reads the Netlist
file, decodes the simulated network topology, finds all
required device models and computation functions, builds
the system matrix and performs the simulation. The
simulation results are saved into binary and ASCII files.
The main binary file is used for showing simulation
waveforms from a stand-alone waveform visualization
application named ScopeView. Some of such output files are
HTML files and can be viewed only through the Internet
Explorer Program.
EMTPWorks can also start a data translator function which
is designed to convert old EMTP96 (previous version of
EMTP) data files into a translated file format which can
be decoded and simulated by EMTP-RV. The Data Translator
is used only as a temporary transition option and has a
limited compatibility with old data cases. There is no
direct mapping between the old EMTP-V3 models and the new
EMTP-RV models and there is no schematic generated by the
translator. |
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Simulation Options |
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EMTP-RV accepts several simulation options which
are performed for arbitrary network configurations. All
options are applicable to all devices within documented
rules of device behavior. These are: |
- Frequency scans
- Steady-state solutions: linear harmonic
steady-state solution, non-linear harmonic steady-state
solution and three-phase power flow
- Time domain solutions: fixed time-step
trapezoidal with/without backward Euler method,
automatic initialization from steady-state, startup from
manual initial conditions and special option for power
electronics instantaneous switching conditions within a
time-step
- Statistical/systematic analysis
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