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SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
5.8.4.3 Flux stabilizer
Flux stabilizer is a first order high-pass filter for the
estimated flux producing current Id. The output of the filter
is correcting term dU added to the output voltage reference.
Code
ID
Description
Notes
P1.8.7.6
1797
Flux stabiliser Gain “Flux stab gain”
Flux stabilizer gain is 0 at the zero speed and is increased linearly with
the frequency to value defined by the Flux Stab Gain which is reached at
the 1 Hz.
The gain is scaled by 1000 and the actual gain of the filter is obtained from
P1.8.7.7
1551
Flux stabilizer TC “Fluxstab TC”
Flux Stabilizer TC defines the corner frequency of the high-pass filter.
The time constant of the filter is calculated from:
5.8.4.4 Voltage stabilizer
The voltage stabilizer is similar to the torque stabilizer
controlling the change in DC-link voltage at frequencies
above 3 Hz. It is a first order high-pass filter for the
measured DC-link voltage Udc. The output of the filter is a
frequency correction term df added to the output frequency
reference. Gain is adjusted relative to the estimated torque.
As the torque increases from 10% to 50 % of the motor
nominal torque, the controller gain decreases from the
voltage stabiliser Gain down to zero. The gain and the
corner frequency of the filter are controlled by the following
parameters:
Code
ID
Description
Notes
P1.8.7.9
1552
Voltage stabilizer TC “VoltageStab TC”
This parameter defines the corner frequency of the high-pass filter.
The time constant of the filter is calculated as
= 1ms
ms
VoltageStabTC
1000 – VoltageStabTC
VoltageStabTC
1000 – VoltageStabTC
T
c
= T
s
P1.8.7.8
1738
Voltage stabilizer Gain “VoltStabGain”
Voltage Stabilizer Gain is a function of a torque. If the torque is below 15%, the gain is
the value defined by the Voltage Stabilizer Gain. If the torque is above 50% the gain is
0. Between 15-50% the gain decreases linearly with the torque from Voltage Stabilizer
Gain to 0. In other words,
G = G VoltStabGain, if T< 15%
G = 0 if T>15%
35%
(
50% – T
(
%
)
),
if 15%
≤ T < 50%
G = VoltStabGain
The final gain is obtained by considering the value of Voltage stabiliser TC and the
scaling in which 256 means the gain 1. So, the final and the actual gain of the filter is
obtained from
The gain and the corner frequency of the filter is controlled
by the following parameters.
G = G VoltStabGain, if T< 15%
G = 0if T< 15%
35%
(
50% – T
(
%
)
),
if 15%
≤ T < 50%
G = VoltStabGain
G
= FluxStabGain * f , if f < 1 Hz
G= FluxStabGain * f , if f ≥ 1 Hz
G
f
=
= FluxStabGain
1000
1000
G
T
C
= T
S
− 1 )
= 1ms (
65536 − 2 * FluxStab TC
2 * FluxStab TC
65536
2 * FluxStab TC
For example , if Flux stabilizer TC = 64 , it follows that T
C
= 511MS and
ω
C
= 1.96 rad/s.