Siemens SINAMICS S120 System Manual page 116

Commissioning
7.7 Commissioning the grid droop control
Additional parameter settings for synchronizing an island grid to an external grid
The following table provides an overview of the most important adjustable parameters with
typical values and notes for an application involving synchronizing an island grid to an
external grid.
This overview should provide help when commissioning the system. It does not replace the
information in the previous chapters or the parameter descriptions and function charts in the
List Manual.
Depending on the application, in individual cases, it may be necessary to change
parameters, which are not listed in the tables.
Table 7- 15 Parameter settings for "INFEED" drive unit
Parameter Value
p5486[1] e.g. 690 V
p6420[1]
1)
p6421[1] e.g. 100 %
p5487[2] e.g. INFEED.r5461[1]
116
Comment
Transformer rated primary voltage, island grid transformer
The rated voltage of the external grid is specified in p5486[1], with which the
island grid is to be occasionally connected to with switch (9). An island grid trans-
former (8) is provided between the island grid and external grid so that the island
grid can be synchronized.
It should be noted that when converting the voltage data from the external grid to
the connection point of the Active Line Module, the infeed transformer must also
be taken into account.
Setting the rated primary voltage of the grid transformer, to whose secondary an
island grid with Active Line Module in grid droop operation (p5401) is connected.
Typically, the primary of this transformer is connected to the power grid or another
island grid via a circuit breaker. Setting the primary voltage and setting the device
supply voltage (p0210) define the ratio of the island grid transformer.
Transformer phase shift, island grid transformer
Setting the overall phase shift between the island grid transformer and the infeed
transformer. There is no automatic identification routine available for this phase
shift.
When converting the external voltages to the connection point of the Active Line
Module (see r5488[3, 4]) it should be noted that the sum of the phase shifts of all
intermediate transformers is effective.
Note: With the circuit breaker is closed at the infeed transformer and at the island
grid transformer, a correct setting of p6420[1] and p6421[1] can be identified by
the fact that the characteristics with respect to time of voltages r3468[0, 1] and
r5488[3, 4] approximately coincide for low load conditions.
Transformer gain adaptation, island grid transformer
1)
Setting the overall correction factor for the fine calibration of the voltage conver-
sion ratio between the external grid and the connection point of the Active Line
Module. There is no automatic identification routine available for this correction
factor.
CI: Transformer primary voltage signal source - island grid transformer u12
Signal source for the measured conductor-conductor voltage at the grid discon-
nector (9) for internal conversion to the connection point of the Active Line Mod-
ule.
The converted voltage value transformed into space vector coordinates is indicat-
ed in r5488[3, 4].
The conversion takes into account the ratio between p5486[1] and p0210 as well
as phase shift p6420[1] and correction factor p6421[1].
System Manual, 04/2015, A5E03347436A
Grid infeed