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ACTIVE FRONT END ACTIVE FRONT END Equipment Equipment
Technical Presentation Technical Presentation
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ACTIVE FRONT END RECTIFIER ACTIVE FRONT END RECTIFIER ADVANTAGES
ADVANTAGES
A new rectifier, provided with anIGBT inverter, is rapidly
gainingthe interest of the market forthe following reasons:
Unit power factor: AF canprovide a c!rrent with a verylow
harmonic distortion "T#$ isred!ced to %& when normallyis
'()%*& in case of aconventional rectifier+
The A- c!rrent is in phase withvoltage: the same as
p!reresistive load AF does note.change reactive power withthe line,
/!t e.cl!sively activepower
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ACTIVE FRONT END RECTIFIER ACTIVE FRONT END RECTIFIER ADVANTAGES
ADVANTAGES
Bidirectional power e.change/etween A- mains and $- B!s/ar: AF
is perfectly reversi/le and so it can recover the energyto the
mains saving it
A- c!rrent sin!soidal waveform: very clean energy
-onstant and high $- B!s /ar
voltage: no infl!ences /y themains voltage fl!ct!ations
Theinverter can control the motorsat mains voltage witho!t
thenormal 0*)0(& of derating
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AF rectifier cost is today higher than the cost of a Graet1
Bridge controlled rectifier at0' p!lses
B!t AF !s!ally allows toeliminate power factorcorrection systems
and#armonic Filters
In the standard e.ec!tions with0' p!lses Graet1 /ridge thepower
factor is lower "aro!nd*,2+3 !s!ally this o/liges to!se additional
power factorcorrection systems
4ractically if we consider the costof the total electrical
plantthe cost of AF sol!tion isappro.imately near to thecost of a
more conventional0' 4!lse Graet1 rectifiersol!tion
AFE COST COMPARISON AFE COST COMPARISON
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ACTIVE FRONT END Rectifier scheme ACTIVE FRONT END Rectifier
scheme
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AFE & OPD inverter in a cabinet solution1.200 kW 690V equi
!ent
mod!lar design air cooling 4ower mod!le : IGBT power circ!it
low ind!ctance connection
456 mod!lation"0,(k#1 : (k#1+
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ACTIVE FRONT ENDfeatures and customer benefits at a glance
Regenerative feedback(4-quadrant operation)
Sinusoidal line currents lowharmonics
AFEfeatures
No commutation faults whenthe power fails in
regenerativeoperation
ine suppl! voltage fluctuationsare compensated
"#tremel! high drive d!namicperformance
$ower factor as requiredbetween %&' '& cap*ind
Operationalreliability hi!h
a"ailability#o$er capitalin"estment
costs
#o$eroperatin!
costs
No comple# circuit+ low probabilit! of faults
Regenerative braking into the line suppl!
Not influenced b! otherloads
,ables+ filters+transformer (standard) ower power costs
"#tremel! low dela! time ,apacitor batter!for energ! storage
eak networks+ lineSuppl! interruptions
No downtimes
.or line suppl! withsignificant voltagefluctuation
/rive can bedimensioned smaller No downtimes
No compensation.ewer componentsReduced reactivepower
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OPD AFE STRONG POINTS
6od!lar approch -ompact design asy to assem/le 74$ reg!lation
kit with
the same controlf!nctions
Imm!nity Ins!lation
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SOLUTIONS FORWATER
& WIND TURBINES
-haracteristics: direct drive, asynchrono!s generatorand $FI
sol!tion with8witho!t encoder power factor control and c!rrent
T#$/elow %&
9tandard $I- ( ;* high static precision, dynamic speed
andtor
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"O#$% O' FO( WA%E( %$() 'E"
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"O#$% O' FO( W 'D %$() 'E"
