Protective Elements
Functional Principle of the LVRT
From the grid operators point of view, a
LVRT
profile defines a voltage profile which a distributed energy resource,
that is connected to the grid, should be able to ride through in case of a low voltage event (voltage dip). The
distributed energy resource is only allowed to disconnect from the grid if the voltage at the point of common
coupling drops below the
LVRT
borderline. In other words, a LVRT protection function is a time-dependent voltage
supervision according to a predefined voltage profile. The time-dependent voltage supervision will be started, as
soon as the voltage at the point of common coupling falls below the start voltage level. The
LVRT
will be stopped,
as soon as the voltage rises above the recover voltage level.
998 MCDGV4 DOK-HB-MCDGV4-2E
Voltage [%]
Short Circuit Duration [s]
Source: eBWK Bd. 60 (2008) Nr. 4
Authors: Dipl.-Ing. Thomas Smolka, Dr.-Ing. Karl-Heinz Weck, Zertifizierungstelle der FGH e.V., Mannheim, sowie Dipl.-Ing. (FH) Matthias Bartsch,
Enercon GmbH, Aurich.
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