.OpenIWPI.UsersGuide.GettingStarted .OpenIWPI.UsersGuide.GettingStartedThe OpenIWPI was developed to be a
tool helping engineers to simulate, at the same time, phasor-based
and EMT-like circuits that are connected to each other. The main
idea is to be able to interface detailed components, using EMT-like
representations, with power system grids, which are usually modeled
in their phasor-domain positive-sequece equivalents. The library
can be helpful when studying interconnection impacts of
power-electronic devices in power grids.
The interface uses electrical connectors from the Open-Instance
Power System Library - OpenIPSL and from the Modelica
Standard Library - MSL. Therefore, the library is
ideal for interconnecting phasor-based representations built using
the OpenIPSL with EMT-like models that are built using
the electrical library within the MSL. Note that the
user will need to have both libraries (OpenIPSL and
MSL) loaded before loading the OpenIWPI
library.
All models in a Modelica library require initial guess values
that should come from a solution of the steady state of the overall
model. This initial guess for power system is called power flow.
However, there is no power flow solver associated to the library as
of the present time. When building a use case, initialization of
OpenIPSL variables must be performed with a power flow
software. Please review the initialization requirements for
OpenIPSL models in its User's Guide. The EMT-like
portion of the system would be better initialized de-energized, and
connectic as well as starting its operation at a positive time
instant.
The time domain simulations are prepared to work with
Modelica-compliant tools. Users of the
OpenIWPI are free to choose their
tool of choice. However, note that the development of
OpenIWPI has been carried out using
Dymola,
and it might be possible to face issues when using other Modelica Tools that we have not
fully tested.