Siemens SINAMICS G130 Engineering Manual page 67

The fundamental power factor cosφ
The relation between the active power P and the fundamental apparent power S
power factor cosφ " and is defined as follows:
1
The fundamental power factor cosφ
impedance or the Relative Short-Circuit power (RSC) at the PCC (Point of Common Coupling) and on the drive load.
The following table shows the typical values of the fundamental power factor cosφ
Infeeds described in this engineering manual as a function of the relative short-circuit power RSC. The value for self-
commutated Infeeds (S120 Active Infeed and S150) can be parameterized in the firmware. The factory setting is "1".
Fundamental power factor cosφ
SINAMICS G130, G150, S120 Basic Infeed and S120 Smart Infeed
Relative short-circuit power RSC
> 50 (strong line supply)
15 ... 50 (medium line supply)
< 15 (weak line supply)
Fundamental power factor cosφ
SINAMICS G150 with option L01
Relative short-circuit power RSC
No significant dependency on RSC
Fundamental power factor cosφ
SINAMICS S120 Active Infeed and S150 with factory setting of cosφ
Relative short-circuit power RSC
No significant dependency on RSC
Typical values of the fundamental power factor cosφ
The total power factor λ
The relation between the active power P and the total apparent power S is referred to as the "total power factor λ"
and is defined as follows.
The total power factor λ of the different SINAMICS converters and Infeeds is dependent on the line impedance or the
Relative Short-Circuit Power (RSC) at the PCC (Point of Common Coupling) and on the drive load.
Since the total power factor λ includes the distortive (reactive) power D generated by harmonic currents as well as
the fundamental reactive power Q
currents with harmonic content.
The following table shows the typical values of the total power factor λ for the SINAMICS converters and Infeeds
described in this engineering manual as a function of the relative short-circuit power RSC.
The value for self-commutated Infeeds depends on the fundamental power factor cosφ
firmware for which the factory setting is "1".
Fundamental Principles and System Description
1
P
j
= =
cos
1
S
P
1
of the different SINAMICS converters and Infeeds is dependent on the line
1
for line-commutated SINAMICS converters and Infeeds
1
for line-commutated SINAMICS converters with LHF compact
1
for self-commutated SINAMICS converters and Infeeds
1
for SINAMICS converters and Infeeds
1
P P
l
= =
S
+ +
2 2
P Q D
1
, it is always smaller than the fundamental power factor cosφ
1
I
P
= -
1 act
+ +
2 2 2 2
Q I I
- -
1 1 act 1 react
100 % load
≈ 0.975
≈ 0.970
≈ 0.960
100 % load
≈ 0.99 capacitive
to "1"
1
100 % load
≈ 1.00
I
= -
1 act
2
+ +
2 2
I I
- -
1 act 1 react
SINAMICS Engineering Manual – November 2015
Engineering Information
is referred to as the "fundamental
1
.
for the SINAMICS converters and
1
.
= ¥
h
å
2
I
h
=
h 2
in the case of line
1
parameterized in the
1
Ó Siemens AG
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