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
