10.Settings
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10.Settings
EN
10. Settings
10.1 Overview
This chapter describes how to edit the configurable settings.
●
Active and Reactive Power
● Grid change
● Insulation mode
● RS485 ID Setting
● Firmware Update
10.2 Active and Reactive Power Control
ETHERNET
NOTE
This section applies only to LVD grids. To
make adjustments described you must
have the communication module that has
ETHERNET for Web Interface access.
10.2.1 Overview
Function/Mode
Availability
Description
DE
LVD
CEI
0-21*
Effective power control
Power limit
x
x
For setting the maxi
-
mum generated active
power
Power vs. Frequency
x
x
For setting the power
gradient with respect to
the frequency
Reactive power control
Constant cos φ
x
x
For setting a fixed value
for cos φ (inductive or
capacitive)
cos φ (P)
x
x
For setting a value
of cos φ (inductive or
capacitive) depending
on the active power
ratio P/P
n
Reactive power
constants
x
For setting the reactive
power ratio Q/S
n
.
Q (U)
x
For setting the reac
-
tive power ratio Q/S
n
depending on the volt
-
age V.
Fault Ride-Through
(FRT)
x
For setting the feed-
in current in the case
of a symmetric fail
-
ure (= 3 phase) or
asymmetric failure
(= 2 phases).
*CEI 0-21 is not available yet, but certification is ongoing
There are 2 settings for active and 4 settings for reactive
power control based on the requirement from network oper
-
ator. The user can select either or both active power control
methods and/or one of the reactive power control methods.
10.2.2 Active Power Control
10.2.2.1 Power Limit
User can reduce inverter output power by set percentage of
actual or rated power.
10.2.2.2 Power vs. Frequency
According to VDE-AR-N 4105 (5.7.3.3):
At frequencies between 50,2Hz and 51,5Hz, all adjust
-
able power generation systems shall reduce (for frequency
increase) or increase (for frequency decrease) the active
power Pm generated instantaneously (at the time of
exceeding the mains frequency 50,2Hz; freezing the value
on the current level) with a gradient of 40% of Pm per
Hertz).
According to CEI 0-21 (8.5.3.2):
Within a frequency range from 50,3Hz to 51,5Hz, all adjust
-
able production plants equipped with static converters have
to be able to reduce the currently generated active power in
case of an increase of the frequency with a variable droop
of 2% to 5% with a default value of 2.4% (with corresponds
to a power gradient of 83.3%/Hz).
User can set all necessary settings to meet the require
-
ments from network operator.
P
0
Gradient 40% Pm/Hz
Pm
Fstart(50,2Hz)
Power vs. frequency curve for VDE-AR-N 4105
P
0
Fstart(50,3Hz)
Gradient 83.3% Pimax/Hz
Pimax
Power vs. frequency curve for CEI-021
Fig. 11.1.:
Power vs. frequency characteristic
10.2.3.4 Reactive Power / Voltage Characteristic Q(U)
(CEI 0-21)
After selecting “Q(U) control”, User can set Q vs. Grid volt
-
age operation curve as below.
U
Q/Sn
(%)
U1s
U2s
U1i
U2i
Qmin(48.4%)
Qmax(48.4%)
Type A
U
Q/Sn
(%)
U1s
U2s
U1i
U2i
Type B
Fig. 11.2.:
Q(U) characteristic
10.2.4 Fault Ride Through (FRT)
According to CEI 0-21, 8.5.1
To avoid undue separation from the network if voltage
dips occur, agereration system with over 6 kW total power
must be able to comply with certain functional require
-
ments, which are known as LVFRT(Low Voltage Fault Ride
Through) in international literature.
10.2.3 Reactive Power Control
With active power output, it must be possible to operate the
generating plant in any operating point with at least a reac
-
tive power output corresponding to a active factor at the
network connection point of :
cos ϕ = 0.8 underexcited to 0.8 overexcited
(VDE-AR-N 4105, CEI 0-21 cos ϕ = 0.9 underexcited to 0.9
overexcited)
Values deviating from the above must be agreed upon by
contract. 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 sta
-
tion. The setting value is either:
1. A fixed power factor cosφ (VDE-AR-N 4105 ,CEI 0-21)
2. A displacement factor/active power characteristic curve
cosφ(p) (VDE-AR-N 4105 ,CEI 0-21)
3. A fixed reactive power in Var.(CEI 0-21)
4. A reactive power/voltage characteristic Q(U). (CEI 0-21)
10.2.3.1
Fixed Power Factor cosφ (VDE-AR-N 4105, CEI
0-21)
User can set power factor from Cap 0.8 to Ind 0.8 (inverter
would stop reactive power control if output power is below
20% rated power).
10.2.3.2
cosφ(P) (VDE-AR-N 4105, CEI 0-21)
Once user enables this method, inverter will deliver reac
-
tive power according to output active power at that moment.
Figure 6-3 is an example.
Cap 0.9
Ind 0.9
P/Pn
1
cosφ
0.5
P1
P2
Upper limit
lower limit
0.2
No cos φ (P)
is allowed
10.2.3.3 Fixed Reactive Power In Var. (CEI 0-21 )
Once user enables this method, inverter will deliver reactive
power (ie. Q) according to the fixed reactive power setting.
The setting range is from Cap 48.4% to Ind 48.4%.
