Function Modules; Overview - Siemens SINAMICS S120 System Manual

Function modules

The function modules, which are required to feed power into an island grid or micro grid – or
to fulfill the grid code requirements of a power grid – are described in this chapter.
5.1

Overview

Power and island grids have different requirements relating to the open-loop and closed-loop
control for grid infeeds. The firmware includes function modules that can be selected
depending on the particular control task. The parameters contained in the function modules
can only be seen after first activating the function module; information about the parameters
is provided in the List Manual.
● Grid transformer function module
The "Grid transformer" function module is used to magnetize, synchronize and to connect
a grid transformer to a power or island grid. In addition, using this function module in
conjunction with the "Grid droop control" function module, a black start can be realized for
an island grid. This can then be subsequently synchronized to a power grid.
The "Grid transformer" function module does not require a license.
The function module includes the following subfunctions:
– Grid-friendly transformer magnetization
– Identification of the transformer data
– Transformer model to take into account the transformer for the grid control and
– Negative sequence system current control to compensate for grid dissymmetries
– DC component control to avoid DC components in the AC current, therefore avoiding
– Support of additional VSM10 modules to measure the voltage for transformer
– Line filter and transformer monitoring
– Additional grid PLL and synchronizing functions
– Extended current limits
This function module is activated in the STARTER operating software.
A detailed description of the activation is provided in Chapter "Commissioning the grid
transformer (Page 102)".
Grid infeed
System Manual, 04/2015, A5E03347436A
dynamic grid support
transformer saturation
magnetization and synchronizing an island grid
5
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