Environmental Engineering Reference
In-Depth Information
CC.S2.3.3
For
WFPSs Connected
to the
System
at a voltage of
132 kV
and
above the minimum connected impedance applicable to the whole
WFPS
as a single unit will be specified in the
Connection
Agreement
or other agreement. The
TSO's
requirements for the
impedance will reflect the needs of the
Transmission System
from the fault level and stability points of view. For
WFPSs
Connected
to the
System
at a voltage of 33 kV the short-circuit
ratio measured at the
Connection Point
shall not be less than 0.5.
CC.S2.3.4
Given wind speeds equal to, or faster than, the manufacturer's cut-
in point, and equal to, or slower than, the manufacturer's cut-out
point, for operation of the
Wind Turbine Generators
in the
WFPS
, both as specified within the
Connection Agreement
for
the particular site, a
WFPS
must be capable of continuously sup-
plying
Output
in accordance with the power curve as specified/set
out in the
Connection Agreement
within the
System Frequency
range 49.5-50.5 Hz. Within the
Frequency
range 49.5-50.5 Hz
there must be no reduction in
Output
whilst
Frequency
is falling.
Any decrease in
Output
to a level below the
Output
to be deliv-
ered in accordance with the power curve as specified/set out in
the
Connection Agreement
or other agreement occurring in the
Frequency
range 49.5-47.5 Hz must not be more than pro rata
with any decrease below nominal
Frequency
.
CC.S2.3.5
The
Output
measured at each
Wind Turbine Generator
term-
inal should not be affected by voltage changes in the normal
operating range specified in
CC
.5.4.
CC.S2.3.6
(a)
In the event of a step change in voltage each
WFPS
shall
remain
Connected
to the
Transmission System
as specified
in the following diagram and the remainder of this
CC
.S2.3.6.
U/Un
Fault Ride Through Capability of WFPSs
90%
15%
0
150
625
Voltage vs Times profile at WFPS Connection Point
3000
ms
CC.S2.3.5 Figure 1
Shows the time based requirement for a
Wind Farm Power
Station
to remain
Connected
to the
Transmission System
during periods of reduced voltage on that
System
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