4.1 Transfomer-Less vs Transformer-Based UPS 080224

8/3/2019 4.1 Transfomer-Less vs Transformer-Based UPS 080224

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Newave SA, Switzerland [email protected] - www.newaveups.com28/02/2006 ML3-49 1

Newave TransformerlessNewave Transformerless

Double Conversion TopologyDouble Conversion Topologyvversusersus

DoubleDouble Conversion TopologyConversion Topology


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Newave SA [email protected] - www.newaveups.com28/02/2006 ML3-49 2

TRADITIONAL TOPOLOGY


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Large physical size

Physically heavy:120kVA (6pulse) from 700 to 1200 kg

120kVA (12pulse) from 1200 to 1800 kg

Large footprint120kVA (6pulse) from 0.64 to 1.1 m2

120kVA (12pulse) from 1.30 to 2.2 m2

More space required to extract

additional hot air due to

additional losses

Size and weight increases withthe addition of input filters

ca.1000 mm

120 kVA (6pulse)

V = 1.44 m3

Footprint = 0.80 m2 800

mm

1800mm

800mm

ca.2000 mm

120 kVA (with 12pulse)

1800mm

V = 2.88 m3

Footprint = 1.6 m2

DOUBLE CONVERSION TOPOLOGYTHE FACTS: TRANSFORMER BASED


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Double Conversion with output transformer Internal battery up to a maximum of 30 kVA only

Only a fixed number of batteries allowed

Batteries subjected to high ripple during charging

DOUBLE CONVERSION TOPOLOGY

THE FACTS: TRANSFORMER BASED


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High input current distortion (> 30%)

Addition of input filters or 12 pulse rectifiers is expensive,

space consuming and decreases efficiency further to < 90%

Low input power factor; 0.6 to 0.86 depending on load




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Low Efficiency (< 92%) Output distortion with non-linear loads is inherently poor

and must be corrected electronically

Neutral is directly connected to the load without

protection




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Input Power On


THE FACTS : TRANSFORMER-LESS


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DC Filter Pre-charging




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Booster in Operation




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Battery Charging




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Inverter Operation




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Normal Operation




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Battery Operation




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Conceptpower DPA , THDi < 2 %Conceptpower DPA , THDi < 2 %

Small physical size

Light weight:120 kW (150 kVA) = 407 kg

Small footprint

120kW (150 kVA) = 0.58 m2


FEATURES: TRANSFORMER-LESS

730 mm

120 kW

V = 1.15 m3

Footprint = 0.58 m2

1975

mm


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Double Conversion, transformerless technology

Variation in number of blocks (40-50) allowed in order to

adjust autonomy times

Separate battery chargers provide improved rippleless

charging




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High input power factor (0.99), independent of the load applied

Fast diode input rectifier with input filter and PFC control does notcreate incompatibility problems with input supplies

Input emergency alternators do not need to be oversized

1997/06/0310:54:36

5ms/div

(5ms/div)

NORM:200kS/s

CH1=50V

DC 100:1

CH2=100V

DC 100:1

DT 5.55ms

=Filter=Smoothing:ONBW:FULL

=Offset=C H 1 : 0 . 0 VC H2 : 0 VC H 3 : 0 . 0 VC H 4 : 0 . 0 V

=RecordLength=Main:10KZoom:1K

=Trigger=Mode:AUTOType:EDGE LINEDelay: 0.0nsHoldOff: MINIMUM

Low input current distortion (< 2 % with 400V input voltage)

- no additional input filtering required




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High efficiency (> 95%) due to transformerless technology and ESIS

1997/06/0310:54:36

5ms/div

(5ms/div)

NORM:200kS/s

CH1=50V

DC 100:1

CH2=100V

DC 100:1

DT 5.55ms




=Trigger=Mode:AUTOType:EDGE LINEDelay:0.0nsHoldOff: MINIMUM

Reduced switching stress on power components higher reliability

ESIS (Energy Saving Inverter Switching) also reduces EMI effects

High efficiency means longer autonomy times as well

as cost savings




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Very low output impedance (< 1%) excellent dynamicperformance and no corrections needed for unbalanced loads

Low harmonic distortion at the output (< 2% with non-linear loads)

Output neutral is decoupled from the mains neutral during

disturbances

1997/06/0310:54:36

5ms/div

(5ms/div)

NORM:200kS/s

CH1=50V

DC 100:1

CH2=100V

DC 100:1

DT 5.55ms




=Trigger=Mode:AUTOType:EDGE LINEDelay:0.0nsHoldOff: MINIMUM




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Efficiency < 92% - additional

cooling may be necessary

Large physical size

Heavy: 120 kVA: 700-1200 kg

Large footprint 1.1 m2 +additional cabinet for 12-pulse +

battery cabinet needed

Number of battery cells is fixed

Batteries subjected to highripple voltage during charging.

Low input power factor (0.6-0.8).

Input current distortion > 30%

- additional input filter required.

Efficiency > 95% - no or little

additional cooling necessary.

Small physical size.

Light weight: 120 kVA = 407 kg.

Small footprint 0.58 m2 noadditional cabinet for 12pulse or

battery cabinet needed.

Variation of number of battery

blocks allowed.

Separate battery charger ensurescorrect rippleless charging.

High input power factor (0.99).

Input current distortion < 2%

- no additional input filters.

Traditional Topology Newave Transformerless Topology

UPS TOPOLOGY COPMARISONOVERVIEW


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Slow switching controlled rect-

ifier may cause incompatibility

with other equipment.

Emergency generator must beoversized.

High output impedance (typ.

8%) - poor dynamic response and

additional corrective circuits

required for unbalanced loads

Higher inherent Output distortion

with non-linear loads

Switching elements switch on at

full load current; increased stress

Fast switching diode rectifier

does not create incompatibility

problems with input supply

No need to oversize emergencygenerator

Low output impedance (< 1%)

- excellent dynamic response

and excellent performance with

unbalanced loads

Low output distortion on all

types of loads

Increased reliability due to

reduced switching stress

Traditional Topology Newave Transformerless Topology

UPS TOPOLOGY COPMARISONOVERVIEW


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4.1 Transfomer-Less vs Transformer-Based UPS 080224

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