Siemens SINAMICS S120 System Manual page 75

7.4 Commissioning example for an infeed with voltage and frequency control for an island grid.
Parameter Value
p1810.4 Yes
1)
p1811 e.g. 5 %
1)
DC link control
p3410 0
p3415[0] 10,00 %
p3415[1] 10,00 %
p3510 e.g. p0210 * 1.5
p3560 e.g. 50 %
p3603 e.g. 0 %
p3615 e.g. 50 %
Generator operation
p5401[0] e.g. INFEED.r2090.1
Grid infeed
System Manual, 04/2015, A5E03347436A
Comment
Inhibit wobbulation (sweep) amplitude (access level 4)
Depending on the filter being used: For standard Active Interface Modules: Yes
Using this bit, the wobbulation function is controlled for regular current-controlled
operation (no grid droop operation). The "Yes" setting is recommended when
using standard Active Interface Modules.
In grid droop operation, the wobbulation function is controlled using p5456. In the
default setting of p5456 wobbulation is activated (i.e. "Inhibit wobbulation ampli-
tude": No).
Pulse frequency wobbulation amplitude (access level 4)
With a setting value of 5 %, regarding the pulse-frequency distortion powers,
typical requirements placed on island grids are complied with.
Infeed identification method – identification (ID) off
Infeed excitation current L identification – run 1
Amplitude of the measured currents for identifying the DC link capacitance
For grids with low fault level (short-circuit rating), we recommend reducing the
measuring current to 10 % (possibly down to 7 %) in order to ensure stable grid
operation during the identification routine. See also: Notes for commissioning
systems for operation on grids with low short-circuit power (fault level) and varia-
ble grid parameters (Page 138).
Infeed excitation current L identification – run 2
Amplitude of the measured currents for identifying the DC link capacitance
For grids with low fault level (short-circuit rating), we recommend reducing the
measuring current to 10 % (possibly down to 7 %) in order to ensure stable grid
operation during the identification routine.
Run 2 is prevented by setting the same value as in p3415[0].
Infeed DC link voltage setpoint
for 690 V 3 AC devices: 1035 V DC
Normally, the setpoint should not be selected to be lower than 1.5x the grid volt-
age, as the control range for the current control would otherwise be limited too
much, and current harmonics would occur.
Upwards, the setpoint is limited by the maximum boost (step-up) factor p3508.
Infeed Vdc controller proportional gain
Note: Setting for soft networks (low short-circuit power)
Infeed current pre-control factor D component
can be increased by up to 50% for load surges in the event of a poor dynamic
response of the controller.
Note: Setting for soft networks (low short-circuit power)
Infeed current controller P gain
Note: Setting for soft networks (low short-circuit power)
BI: Grid droop control activation – grid control activated via PROFIdrive PZD1, bit
1
For p5401[0] = 1, the Active Line Module switches from current-controlled opera-
tion to operation as voltage source (grid droop operation). The current is then no
longer impressed, but is obtained from the connected load and the grid frequency
and grid voltage characteristics.
Commissioning
75