Siemens SINAMICS S120 System Manual page 42

Function modules
5.3 Description of the function modules
Example of a grid code: German BDEW Guidelines
Figure 5-5
Explanation of the voltage characteristic:
①
②
③
The function "dynamic grid support" function ensures that the power inverter can maintain
grid support for at least the time required in this grid code example. Depending on the
parameter settings and the thermal preload, a grid short circuit can be supported for up to 2
s. Time-related shutdown conditions (e.g. in accordance with the diagram above after 150
ms short-circuit), which differ according to specific grid codes, must be implemented using
the grid monitoring (p5540ff), with DCC or in a higher-level controller.
Note
Automatic shutdown
The Active Line Module switches to this operating mode in the case of frequency faults
(120% of the set upper frequency threshold or 80% of the lower frequency threshold) and
shuts down to protect itself (overcurrent, overvoltage, overtemperature, etc.). In all other
cases, the Active Line Module supports the network by injecting a reactive current in
accordance with the characteristic curve..
The shutdown limits for overcurrent (F30001, F6200 to A6205 = 128), overvoltage
(Vdc_max, F30002, F30003, F6200 to A6205 = 16), overtemperature, I2t are described in
the relevant manuals.
42
Limiting characteristics for the voltage characteristic at the network connection point
In the area above the borderline 1, the infeed operation is stabile
In the area between borderline 1 and borderline 2, it must be agreed with the network
operator whether the infeed mode should be maintained or whether the infeed is to be
disconnected from the power system.
Careful disconnection from the network may take place in this area.
System Manual, 04/2015, A5E03347436A
Grid infeed