OneLiner simulation of CIRs in Islands Without Traditional Generators

The converter-interfaced resources (CIR) model in OneLiner V15 is designed to simulate these devices in grid-following operation only. The program assumes that the CIRs are shut down when they are no longer in a network with one or more conventional generators.

We discovered recently that the program sometimes allows a CIR to inject non-zero fault currents even when it is located in a part of the network that has no active traditional generator. An example of such a situation is when a CIR is isolated from the main grid by a branch outage and/or a bus split, and a fault is simulated on a bus within the island.

This error had been fixed in OneLiner V15.5 Build 20639 or later (The program build number is displayed in the OneLiner Help | About dialog box). Users should contact ASPEN support <support@aspeninc.com> to request a software update with the latest bug fixes