Siemens SINAMICS S120 System Manual page 92

Commissioning
7.5 Commissioning example of an infeed with dynamic grid support for a power grid
Parameter Value
DC link control
p3410 0
p3415[0] 10,00 %
1)
p3415[1] 10,00 %
1)
p3510 e.g. p0210 * 1.5
p3511
1)
Grid transformer
p5460
1)
p5480 e.g. 1 (normal operation)
p5481[0] e.g. 2 s
p5481[1] e.g. 1 s
1)
p5483 e.g. 1
92
Comment
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.
Identification is not possible for extremely low grid fault levels.
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.
Identification is not possible for extremely low grid fault levels.
Infeed DC link voltage setpoint
for 400 V 3 AC devices: 600 V DC
Normally, the setpoint should not be selected to be lower than 1.5x the grid
voltage, 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.
CI: Infeed DC link voltage supplementary setpoint
Using the connector for the supplementary setpoint, the DC link voltage setpoint
can be changed; for example, this is required for photovoltaic applications for
the higher-level MPP control.
VSM2 input grid voltage voltage divider
Sets a voltage divider for the Voltage Sensing Module 2 (VSM2).
Using a measuring transformer, the 100 V input of the VSM can also be used to
measure voltages in a medium voltage grid.
For a 20 kV primary voltage and connection at -X521 (100 V input) and a
measuring transformer with a step-down factor of 200:1, a value of 20000 %
can be set, for example.
Transformer magnetization mode
Also see the following chapter about transformer magnetization.
Transformer magnetization ramp-up time/bounce time/timeout: Voltage ramp-up
time
Ramp-up time to magnetize the grid transformer
Transformer magnetization ramp-up time/bounce time/timeout: Circuit breaker
bounce time
If the time set is less than the actual bounce time, extremely high currents can
occur on pulse enable and cause damage to the circuit breaker.
Note: A permanent feedback signal from the switch is not a sure sign that the
switching process has been completed!
Note: If problems occur when connecting to the grid (e.g. overcurrent, overvolt-
age, power failure F6200), then you should increase the bounce time.
BI: Transformer magnetizing signal source for circuit breaker activation
(sets the signal source for activating the circuit breaker after voltage ramp-up)
Enables the function for closing the circuit breaker when transformer magnetiza-
tion and synchronization are selected
System Manual, 04/2015, A5E03347436A
Grid infeed