General
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1
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 transfers power between DC and AC. AFE cannot
create grid by itself, it needs to be connected to existing grid.
U2
=
~
Filter
G1
U1
Q2
UDC
Figure 1.
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.
Q1
T2
Gr
id
U4
U3
U5
=
~
Filter
U4 = Transf . GC Side
U5 = Transf. Grid Side
D7
T1
Q3
Figure 2.
