1-12
Functional Description
7000-TD002A-EN-P – September 2007
Current Control
The function of the current control block (Figure 1.7) is to determine
the firing angles for the converters
Alpha Rectifer
(327) and
Alpha
Inverter
(328). The inputs are the torque (
InvTorque CurCmd
) and
flux producing (
Inv Flux CurCmd
) components of the dc link current
command from the speed control and flux control blocks respectively,
and the measured dc link current
Idc Feedback
(322).
The square root of the sum of the squares of
Inv Flux CurCmd
and
InvTorque CurCmd
determines the dc link current reference
Idc
Reference
(321). This is subtracted from the measured dc current
feedback is subtracted to determine
Idc Error
(323). This is
processed by the current regulator to produce
Vdc Error
(332). To
effectively control the dc link current an estimate of the motor side
dc link voltage is done to calculate
Vdc Feedfwd
(333) which is
added to
Vdc Error
to produce the reference voltage for the line side
converter
Vdc Reference
(326). The line converter firing angle is the
inverse cosine of
Vdc Reference
. The machine converter firing angle
is determined by taking the inverse tangent of the ratio of
Inv Flux
CurCmd
to the
InvTorque CurCmd
. The quadrant of operation is
adjusted based on the signs of the current commands.
Содержание PowerFlex 7000
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