2 - Schneider Electric CZ, s.r.o.
2 - Schneider Electric CZ, s.r.o.
2 - Schneider Electric CZ, s.r.o.
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Presentation<br />
Variable speed drives<br />
Active Front End (AFE)<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
10<br />
Active Front End (AFE)<br />
Resistor Less Technology<br />
The Active Front End is an option for frequency inverters to return energy to<br />
the line supply. It provides 4-quadrant operation and thus is ideal for all<br />
applications with a generator operating mode.<br />
Special design allows possibility to connect several AFE units in parallel.<br />
This enables:<br />
a higher supply / regenerative power<br />
> > the use of smaller units adapted to the drives in order to reduce the spare parts<br />
> > an increased reliability due to redundancy<br />
Single drive<br />
Common DC bus<br />
Redundancy with AFB in parallel<br />
in common DC bus<br />
3 a Mains supply<br />
50/60Hz<br />
3 a Mains supply<br />
50/60Hz<br />
3 a Mains supply<br />
50/60Hz<br />
LFM<br />
AFE<br />
LFC AIC ATV 71<br />
AFE: Active Front End - LFM: line Filter Module<br />
LFC: Line Filter Choke - AIC: Active Infeed Converter<br />
AFE<br />
LFM<br />
LFC<br />
AIC<br />
ATV 71<br />
3 M<br />
DC Bus<br />
AFE: Active Front End - LFM: line Filter Module<br />
LFC: Line Filter Choke - AIC: Active Infeed Converter<br />
AFE<br />
LFM<br />
LFM<br />
LFM<br />
LFC<br />
AFE<br />
LFC<br />
AFE<br />
LFC<br />
AIC<br />
AIC<br />
AIC<br />
DC Bus<br />
M<br />
ATV 71<br />
1<br />
ATV 71<br />
2<br />
ATV 71<br />
1<br />
ATV 71<br />
2<br />
ATV 71<br />
3<br />
AFE: Active Front End - LFM: line Filter Module<br />
LFC: Line Filter Choke - AIC: Active Infeed Converter<br />
Harmonic Mitigation to increase power quality<br />
State-of-the-art components, a new control concept, as well as a topquality<br />
filter module all serve to reduce the total current distortion factor<br />
THD(i).<br />
Special design allows possibility to connect several AFE units in parallel.<br />
This enables<br />
THD(i) of less than 4%<br />
Power factor of cos Phi 1 independent of the load and the energy direction<br />
> > Line voltage drops of up to 40% without disturbing operation<br />
Up to 60% Energy Savings<br />
> > Energy regeneration to the supplying mains<br />
Improved efficiency and reliability due to innovative control system<br />
> > No damping resistors with heavy losses required and thus it is especially robust<br />
in respect of heavily distorted mains voltages<br />
> > Reduction of transformer losses, wiring and switching devices<br />
M<br />
M<br />
M<br />
M<br />
M<br />
Improved Dynamics & Energy savings<br />
6/6
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