CG Drives & Automation 01-7318-01r1 General description 13
2.1.3 AFR
AFR consists of Emotron power electronic module (AFE)
connected to grid through LCL filter as shown in Figure 4.
The main objective of the Emotron AFR is to rectify the
supply AC voltage into the DC voltage to be fed to or
regenerated from the VSIs (motor inverter). It also keeps the
harmonic content of the current exchanged with grid at low
level, maintaining the THD(I) below 5%. AFR offers
standard AFE functionality such as:
-Active power control.
- Reactive power control.
- Low harmonic operation.
Fig. 4 AFR
2.1.4 AFG
AFG is an AFE variant that offers full/advance grid code
functionality. This variant (AFG) is dedicated for generation
applications where generated energy (through DC-link) is
fed into the utility grid. AFG consists of Emotron power
electronic module (AFE) including voltage measurement
board and brake chopper switch (optional) connected to
grid through LCL filter as shown in Figure 5. Main objective
of AFG is to feed in generated power from DC-link to
utility grid fulfilling the grid code requirements. AFG offers
standard AFE functionality along with full grid support
features such as:
• Grid voltage and frequency (U, F) protection.
• Reactive power (Q) control.
• Anti-islanding protection.
• Grid fault ride through (FRT) capability.
Fig. 5 AFG
AFE
VSI
AFR= AFE + LCL filter
NOTE:
Supply voltage measurement board is mandatory
requirement for fulfilling the basic and advanced grid
code functionality. AFG has internal supply voltage
measurement board (SVMB) connected to K2.
I
LCL
AFE
AFG
U
dc+
U
dc
U
dc-
R
line
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