Reactive power
If necessary, an E-82 E4 equipped with standard FACTS (Flexible AC Transmission System) con‐
trol can supply reactive power in order to contribute to reactive power balance and to maintaining
voltage levels in the grid. The maximum reactive power range is available at an output as low as
10 % of the nominal active power. The maximum reactive power range varies, depending on the
WEC configuration.
FT configuration
By default, the E-82 E4 comes equipped with FACTS technology that meets the stringent require‐
ments of specific grid codes. It is able to ride through grid faults (undervoltage, overvoltage, auto‐
matic reclosing, etc.) of up to 5 seconds (FT = FACTS + FRT [Fault Ride Through]) and to remain
connected to the grid during these faults.
If the voltage measured at the reference point exceeds a defined limit value, the ENERCON wind
energy converter changes from normal operation to a specific fault operating mode.
Once the fault has been cleared, the wind energy converter returns to normal operation and feeds
the available power into the grid. If the voltage does not return to the operating range admissible
for normal operation within an adjustable time frame (5 seconds max.), the wind energy converter
is disconnected from the grid.
While the system is riding through a grid fault, various fault modes using different grid feed strat‐
egies are available, including feeding in additional reactive current in the event of a fault. The con‐
trol strategies include different options for setting fault types.
Selection of a suitable control strategy depends on specific grid code and project requirements that
must be confirmed by the particular grid operator.
FTQ configuration
The FTQ configuration (FT plus Q+ option) comprises all features of the FT configuration. In addi‐
tion, it has an extended reactive power range.
FTQS configuration
The FTQS configuration comprises all features of the FTQ configuration and has been expanded
to include the STATCOM (Static Synchronous Compensator) option. The STATCOM option ena‐
bles the wind energy converter to output and absorb reactive power regardless of whether it gener‐
ates and feeds active power into the grid. It is thus able to actively support the power grid at any
time, similar to a power plant.
Grid Management System
D0376616-2 / DA 7 of 21
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