CHAPTER 2 – POWER ELECTRONICS AND CABINET FEATURES 36
2.3.3 AFE - Active front end
The active front end of the drive consists of an
active rectifier for four-quadrant operation. The
AFE features the same electrical design as the INU
of the drive.
The AFE rectifies the AC voltage of the main power
supply and connects its output to the minus, neu-
tral point, and plus side of the DC link.
The AFE maintains the DC-link voltage at the
required level and provides the desired input
power factor at the point of common coupling
(PCC). The input power factor is adjusted by the
AFE to near unity.
2-6 AFE - Active front end
1
2
3
4
Phase module 1
Phase module 2
Phase module 3
Extracted phase module
IFU
AFE DC link
INU
EMC filter
Utility
Energy flow in driving mode
Energy flow in braking mode
Customer
PCC
M
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