Operation Principle And Hardware Description; Contents Of This Chapter; Operation Principle - ABB ACS880-207LC Hardware Manual

Operation principle and hardware description 15

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Operation principle and hardware
description

Contents of this chapter

This chapter describes the operation basics and the hardware of the IGBT supply unit
(ACS880-207LC).

Operation principle

IGBT supply unit rectifies three-phase AC current to direct current for the intermediate
DC link of the drive. The intermediate DC link supplies the inverters that run the motors.
There can be one inverter unit only (single drives) or several inverter units (multidrives)
connected to the intermediate circuit.
The LCL filter is an essential part of the IGBT supply unit. The supply module does not
work without the filter. It suppresses the AC voltage distortion and current harmonics.
The high AC inductance smooths the line voltage waveform distorted by the
high-frequency switching of the converter. Capacitive component of the filter effectively
filters the high-frequency (over 1 kHz) harmonics.
A grid converter is an IGBT supply unit equipped with optimal grid control functionality.
The grid converter can be used to produce an island AC grid. It is also possible to use
grid converters in parallel with generators to support the operation of a distributed
power system. The grid converter produces sinusoidal three-phase AC voltages from
the DC link voltage of the system. AC voltage magnitude and frequency can be defined
by the user. A grid converter can be used in eg. marine applications where ordinary
power grid connection is not available. For further details, see Optimal grid control
of ACS880 IGBT supply control program supplement (3AXD50000164745 [English]).
Optimal grid control functionality is in use only when the license key N8053 has been
activated on the memory unit. This has been done at the factory for a unit with the
option +N8053. You can see the license information with the Drive Composer PC tool