PEGASE

Final review about PEGASE project results

PEGASE project objectives followed the statement that while considerable progress has been made on the development of common formats for the exchange of power system data, there was no common format for the exchange of models. Indeed, a common format to exchange models would ensure that all Transmission System Operators (TSOs) have a common understanding of how a particular device or control system operates and would be able to simulate accurately the effects their neighbors’ system could have on their own.

As part of this project, the Scilab/Xcos platform has been extended so it can deal with larger networks and support increased modeling flexibility. Because the equations are visible on Scilab software, we provide the capability to build reference models in a very open framework and compare the results with those obtained from other commercial simulation packages.

Using the Scilab/Xcos environment, PEGASE project has also explored how a model of an entire power system could be assembled. The key was to use the Modelica modeling language interfaced with Xcos to define implicit equations and to use Xcos for the block diagrams with information added for solving differential algebraic equations including the treatment of discontinuities.

It is often very tiresome and source of error to write equations to calculate the first and second derivatives of the mathematical expressions describing the power system. Managing the power system model through the Scilab/Xcos environment has made possible the automated derivation of these equations and their integration in simulation tools.

A Power System elementary components palette has also been built for the project with an Xcos block associated to each Modelica model. Once the palette is loaded, the construction of electrical system diagrams is possible by drawing connections between the corresponding blocks in Xcos. Those results are only available for project partners at first.