Terms; Operation Principle; Line-Side Converter - ABB ACS800 Series Hardware Manual

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Terms

Line-side converter: A converter that is connected to the supply network and is
capable of transferring energy from the network to the DC link or from the DC link to
the network.
Motor-side converter: A converter that is connected to the motor and controls the
motor operation.
Four-quadrant operation: Operation of a machine as a motor or generator in
quadrants I, II, III and IV as shown below. In quadrants I and III, the machine
operates as a motor, whereas in quadrants II and IV as a generator (regenerative
braking).

Operation principle

The line-side and motor-side converters consist of six insulated gate bipolar
transistors with free wheeling diodes.
The converters have their own control programs. The parameters of both programs
can be viewed and changed using one control panel. The control panel can be
switched between the converters as described in chapter

Line-side converter

The IGBT supply module rectifies three phase AC current to direct current for the
intermediate DC link of the drive. The intermediate DC link is further supplying the
motor-side converter that runs the motor. The line filter suppresses the AC voltage
and current harmonics.
The IGBT supply module is a four-quadrant switching-mode converter, i.e. the power
flow through the converter is reversible. By default, the converter controls the DC link
voltage to the peak value of the line-to-line voltage. The DC voltage reference can be
set also higher by a parameter. The control of the IGBT power semiconductors is
based on the Direct Torque Control (DTC) method also used in the motor control of
the drive. Two line currents and the DC link voltage are measured and used for the
control.
Operation principle and hardware description
Torque
II I
III
IV
Speed
Start-up and use.