Line Harmonics Filter (Lhf) With Separate Housing (6Sl3000-0J - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information
The oscillating circuit on the line side consists of the Line Harmonics Filter and the supply inductance. It inevitably
results from the electrical filter design and basically also absorbes harmonics present in the supply. This behaviour is,
however, highly undesirable because the Line Harmonics Filter, as a component associated to the converter, should
only absorbe harmonics on the converter side and not those on the line side. As the oscillating circuit on the line side
is unavoidable, it is dimensioned in such a way that the line-side filter effect is as low as possible. This behaviour is
achieved by dimensioning the line-side oscillating circuit differently from the converter-side oscillating circuit and
coordinating the resonant frequency of the line-side circuit with the 3
existant in three-phase supply systems and thus the filter is almost completely without load at its resonant frequency.
th th
The 5 and 7 harmonics are absorbed on the line side, but on a much smaller scale than on the converter side. The
blue, dashed curve in the diagram on the previous page shows the line-side filter characteristics, which is a measure
how much the harmonics present in the supply, are absorbed. For the harmonics relevant in supply systems with 6-
pulse rectifier circuits with the harmonic numbers of h = 5, 7, 11, 13, 17, 19, ...... the blue curve is considerably lower
than the black curve so that the filter, as desired, almost entirely absorbes the converter-side harmonics but only a
small amount of the line-side harmonics present in the supply. Therefore, the LHF primarily filters the converter and
not the supply. An overload of the Line Harmonics Filter caused by the harmonics in the supply is not possible as
long as the harmonic content of the supply is lower than the limit values according to EN 61000-2-4, Class 3, which
allows a Total Harmonic Distortion factor in the voltage of THD(V) < 10 % in relatively harsh industrial environments.
Details can be found in the section "Harmonic effects on the supply system", under the subsection "Standards and
pemissible harmonics".
Converter efficiency with Line Harmonics Filters
Line Harmonics Filters produce losses which impair the efficiency of the converter. When Line Harmonics Filters LHF
and LHF compact are used on SINAMICS G130 / G150 converters, the converter efficiency typically drops by about
1 % from 98 % to 97 %. The steep reduction in the harmonics as compared to 6-pulse converters without Line
Harmonics Filter therefore goes hand in hand with a relatively minor drop in efficiency.
In order to reduce the harmonics on the supply, SINAMICS S150 converters with a pulsed Active Infeed can basically
be used as an alternative to Sinamics G130 / G150 with Line Harmonics Filters LHF and LHF compact. While the
harmonics at the line side are slightly more reduced with the S150, however, these converters are also less efficient
at typically 96 %, so that this alternative solution cannot be recommended from the energy point of view.
The boundary conditions which must be considered for use of the two variants of Line Harmonics Filters are
described in detail below:
·
Line Harmonics Filter (LHF) with separate housing (6SL3000-0J_ _ _-_AA0).
·
Line Harmonics Filter compact (LHF compact) as option L01 for SINAMICS G150 cabinet units.
1.5.2.2 Line Harmonics Filter (LHF) with separate housing (6SL3000-0J_ _ _-_AA0)
Line Harmonics Filters (LHF) are stand-alone filters in a separate housing with degree of protection IP21 which can
be operated in combination with SINAMICS G130 Chassis units and SINAMICS G150 converter cabinet units and
which are installed between the low-voltage distribution panel in the plant and the SINAMICS converter.
Preconditions for using these Line Harmonics Filters (LHF) are:
·
A line-side fuse protection for the LHF
·
A main contactor or a circuit breaker on the converter side
·
A converter-side line reactor with a relative short-circuit voltage of 2 %
Point of Common
Coupling PCC External
line-side
fuse protection
PCC
Additional components required in conjunction with stand-alone Line Harmonics Filters (LHF)
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG
Line
Main
Harmonics
contactor
Filter
LHF
rd
harmonic. This harmonic is virtually non-
Converter with
6-pulse rectifier
G130 / G150
Line
~
reactor
~
v = 2%
k