Parameterizable Bandstop Filters For Active Infeed Controls In Chassis Format - Siemens SINAMICS S120 Function Manual

Infeed
3.1 Active Infeed
Example: Setting the harmonics controller
The 5th and 7th harmonics harmonics are to be compensated.
Table 3-4
Index
[0]
[1]
The phase currents in parameter p0069[0 ... 2] (U, V, W) can be checked using the trace function of the
commissioning tool.
3.1.7

Parameterizable bandstop filters for Active Infeed Controls in chassis format

Overview
Parameterizable band-stop filters that can be used to dampen system resonance are available
for the current control loop. The main application for these band-stop filters is in weak line
supplies in which the resonance point of the line filter can drop to one quarter of the controller
frequency. Resonance effects in oscillating line supplies can be suppressed with the aid of
these band-stop filters.
Function description
The band-stop filters are managed in the "Supplementary closed-loop control" function module.
Activating the function module
1. Select the infeed unit in the project navigator and open the "Properties" shortcut menu.
The "Object properties" dialog then opens.
2. Click the "Function modules" tab.
3. Activate the "Additional closed-loop controls" function module in the function modules
selection with a mouse click.
Parameter r0108.03 indicates whether the function module has been activated.
Parameterizing the function
Because the same filter algorithms are involved, the settings of the band-stop filters are always
comparable with the settings of the current setpoint filters (see Section "Current setpoint filter
(Page 100)").
To prevent resonance effects for nets with low short-circuit power (small RSC), a band-stop
filter (with defined notch depth) for approx. 0.25-fold controller frequency (see p0115) is chosen
typically. Appropriate values for the attenuation are preset for the numerator and the
denominator. Only the natural frequencies for the numerator and the denominator may need to
be adapted.
40
Example parameters for the harmonics controller
p3624
5
7
p3625
100 %
100 %
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions