1. General; Afe Control; Island (Static Power Supply) - Vacon NXP ARFIFF03 Applications Manual

8 · VACON®

1. General

This application is not kept backwards compatible. See chapter Compatibility issues before you
update the application. The Grid Converter application is used to make AC grids with a possibility to
operate in parallel with other power sources. The Grid Converter application has 3 different operation
modes:
- Standard AFE mode.
- Island mode.
- Micro Grid mode.
1.1

AFE Control

AFE function keeps constant DC voltage. AFE mode tr ansfer s power between DC and AC. AFE cannot
cr eate gr id by itself, it needs to be connected to existing gr id.
G1
1.2

Island (Static Power Supply)

Island mode generates constant voltage and frequency. In island mode DC Voltage is not controlled.
Island mode cannot operate in parallel with other power sources in AC side, because the drive will
not balance reactive or active power with other power sources.
DC voltage level needs to be considered to have correct voltage on AC side in different load
situations, considering voltage losses in LCL filter and in transformer.
NOTE! Recommended to have transformer delta winding on drive side always.
MCB Control
Q2
U2
Filter
U1
Figure 1.
D7
MCB Control
U3
Filter
Figure 2.
Local contacts: http://drives.danfoss.com/danfoss- drives/local- contacts/
arfiff03 Grid Converter
UDC
~
=
T1
U4
U5
D Y
Q1
T2
U4 = Transf. GC Side
U5 = Transf. Grid Side
S1