27
P
Pm
f
start
f
stop
f
(Hz)
Gradient
P
Pm
f
recovery
f
start
f
stop
f
(Hz)
Gradient
6-1-a
6-1-b
Figure 6-1 Power vs. frequency characteristic
6.2 Reactive Power Control
According to BDEW:
With active power output, it must be possible to operate the generating plant in
any operating point with at least a reactive power output corresponding to a
active factor at the network connection point of
cos φ = 0.95 underexcited to 0.95 overexcited
Values deviating from the above must be agreed upon by contract. In the
consumer reference arrow system (see Annex B.4), that means operation in
quadrant II (under-excited) or III (overexcited).With active power output, either a
fixed target value for reactive power provision or a target value variably
adjustable by remote control (or other control technologies) will be specified by
the network operator in the transfer station. The setting value is either
a) a fixed
active factor cosφ or
b) a active factor cosφ(P) or
c) a fixed reactive power in MVar or
d) a reactive power/voltage characteristic Q(U).
6.2.1
Fixed Active Factor cosφ
User can set reactive current from Cap 0.80 to Ind 0.80 (inverter would stop
reactive power control if output power is below 10% rated power).
