This test case consists in three different grid-forming converters (one with a droop control, one with a dispatchable virtual oscillator control and one with a matching control) connected to a load. At t = 0.5 s the line connecting the 250 MVA (droop) and the 1000 MVA (matching) converters is opened. At t = 1.5 s, a short-circuit occurs in the middle of one of the lines connecting the 250 MVA (droop) and the 500 MVA (dVOC) converters. It is cleared after 150ms. This test case and the grid-forming converters controls come from the Horizon 2020 European project MIGRATE, and more precisely from its Deliverables 3.2 and 3.3 that can be found on the project website : https://www.h2020-migrate.eu/downloads.html.
The two following figures show the expected evolution of the frequency and the current for each converter during the simulation.
One can remark that after the events, the frequencies of the three converters are equal and close to their value before the events, thanks to the power-sharing allowed by the outer loop controls (droop, matching and dVOC).
One can also remark that during the fault, the currents of the three converters are limited at a value lower than 1.2 pu thanks to the virtual impedance. More details can be found in the MIGRATE project deliverables.
.Dynawo.Examples.GridForming.GridForming
