sm150 advantage vs competitor a - gongkongftp.gongkong.com/uploadfile/datum/2008-6...slides: 3...

Slides: 1

Siemens product performance features

Competitor productprofile

Components

Control technique and robust design

Power, transport units

Service friendliness

B.Rasch A&D LD IB mail to: [email protected]

SINAMICS SM150

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Components




Product overview

Voltage: 3.3 kV

Power: 12.5 – 35 MVA (20S)

Motor: SM or IM motor

Operation: 4 Q (Active Front End)

Output frequency: 0 ... 90 Hz( for SM)

Topology: 3-level voltage-source DC link inverter

Technology: IGCT (Integrated Gate Commutated Thyristor)

Cooling: Water

Closed-loop control: TRANSVEKTOR® closed-loop control

Options: Common DC bus for power equalization for 2 or 3 motors, reactive power compensation using AFE,closed-loop technology control, excitation supply

Typical features: High-end performance, high dynamic response andregenerative feedback, low and high speeds, low stressing on the line supply – “line friendly”

SINAMICS SM150

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Components




Product features

low stressing on the supply, e.g. cosphi = 1adjustable line supply power factor (capacitive)extremely high motor dynamic responselow torque ripplehigh efficiencyoperation that results in low motor stressing

Typical applications:Metal: Rolling-mill main drives

Mining: Mine hoists, conveyor belts

Others: Test stands, reactive power compensation

SINAMICS SM150

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Components




Voltage-source DC link inverter (VSI):IGCT technology , 3-level inverter,

line-side AFE or 12/24-pulse diode rectifier, closed loop DTC control

Cooling type:Water cooling with de-ionized water

Configurations:Up to 3x in parallel, DC bus, optional braking chopper.

Product profile (1) of competitor

Competitor - Product overview

Slides: 5



Components




Power range: 3-11MVA (1 min.) up to 31MVA (1min.)

Supply voltage: 3.0 to 3.3kV

Overload capability: 150% (1min)

Efficiency: ≥ 98% at rated load

Power factor: Line supply: 0,95 with DFE /1,0 with AFEMotor: Induction motor typically >0,84;

synchonous motor 1,0 max.

Max. output frequency: 75HzField-weakening range: max.1:5

Degree of protection: IP32

Cable connection: From the top or from the bottom

Motor: Induction and synchronous motor, the same or different size/type, as single-motor or multi-motor drive, also permanent-magnet SM.

Dimensions: 4800 x 1000 x 2185 (LxDxH) basic unit with closed-loop control without cooling system

Product profile (2) of competitor

Competitor - Product overview

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Components




The best solution for every power range

SIEMENS strategy:HV-IGBT module for low power ratings, IGCT for high power ratings.

HV-IGBT module IGCT, GCT IEGT PPI

1 – 5 MVA SIEMENS

Conducting losses Higher LowerSwitching frequency 300 – 500 Hz 500 Hz, DTCSnubber circuit None di/dt, clampShort-circuit proof Yes NoProtection for themechanical system

Short-circuit proof IGBTs

Local arcingdi/dt reactor

5 – 12 MVA SIEMENS

Conducting losses Lower Average HigherSwitching frequency 200 Hz PWM

500 Hz DTC500 Hz 500 Hz

Snubber circuit di/dt, clamp Leak. induct.,clamp NoneShort-circuit proof No No YesProtection for themechanical system

di/dt reactor Leakage inductance, mechanical system

Short-cir. proof IGBTsmechanical system

competitordisadvantage

competitor too high switching frequency

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Components




SINAMICS SM150:Transvector control with ROTOS

(Reduced Optimized Task Oriented Switching)

Competitor :DTC

(Direct Torque Control)

Einzelharmonische im Strom

0

1

2

3

4

5

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37

THD: 5,5%

-4000

-3000

-2000

-1000

0

1000

2000

3000

4000

0,0000 0,0100 0,0200 0,0300 0,0400 0,0500 0,0600 0,0700 0,0800 0,0900 0,1000

Zeit [ms]

Spannung [V]Strom [A]

• Predictable harmonics• Lower IGCT switching frequency

200 Hz (high efficiency, high individual power ratings)

• Operation with low motor stressing• Extremely good current waveform

• Unpredictable harmonics• Higher IGCT switching frequency

350 Hz (losses, lower individual power rating)

• Supplementary losses in the motor• Lower quality of the current waveform

Better in efficiency and current characteristicSINAMICS SM150

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Components




G

SIEMENS uses provenConverter Design

+- MP

3 x3 x

+- MP

3 x3 x

+- MP

3 x3 x

+- MP

3 x3 x

+- MP

3 x3 x

+- MP

3 x3 x

Reference:Maanshan Hot Strip Mill in operation since year 2004

IndependentConverters

Higher transformerimpedance (12%)

only 80ms breaking time

is required

Low short circuits can be keptunder control!

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Components




This is not a proven concept

Design Doubts/Risks:DC Link short circuit can cause extensive damage since 7 units of powerinverters (with high energy stored in the dc capacitors) are connected to the common dc bus. It is unlikely that such a configuration will withstanda dc fault without destructive damage.

Risk of voltage and power oscillation on the common dc linkbecause of large dimensions and longer length of dc link.

The series connection of transformers at primary side is sensitive to unsymmetric cuurent distribution. Saturation effects

< 60 ms breaking time is

required

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Components




Higher power rating per basic unitSINAMICS SM150: Competitor:

Short time overload power:12.5 MVA

Reason:Our ROTOS control technique allows a higher power utilization of the IGCT elements.

Consequences:Higher reliability and smaller size in the range12.5 MVA and 35 MVA overload power.

Transport units (LxDxH):Power unit, 3-phase unit:2.3 x 1.5 x 2.5 m

Short time overload power:11 MVA (same IGCT)

Reason:The TDC operates with a higher switching frequency and results in higher semiconductor losses.

Consequences:Lower reliability andlarger size in the range11 MVA and 31 MVA overload power.

Transport units (LxDxH):Complete drive inverter with cooling system, e.g.: 5.5 x 1.0 x 2.2 m

SINAMICS SM150

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Components




IGCT Based Voltage Source ConverterSINAMICS SM150

High Reliability Self-HealingDC Link Capacitors

In the SINAMICS medium-voltage converters MKP film capacitors are used.

They offer the following advantages:

Maintenance-free due to dry impregnation

Self-healing in case of localized film defects

In contrast to electrolytic capacitorsno leaks or explosions possible

Expected life time up to 200,000 hours(> 22 years) (electrolytic capacitors: 5 years)

Circuit breaker

Converter transformer

Active Line Module(3-level inverter)with IGCT

Motor Module(3-level inverter)with IGCT

Motor-side pts and cts

DC link withdry-type capacitors

MV motor

Line-side cts

Line-side pts

=

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Components




SINAMICS SM150 Competitor :• Transparent design, generous

mechanical design• Phase module stacks can be

replaced quickly• Semiconductors can be replaced

quickly, also in the mounted stack (our recommendation: Customers keep a stock of stacks)

• High packing density, non-transparent mechanical design

• Stack plug-in contacts represents a quality risk

• The stack must be removed in order to replace the free-wheeling diodes.

Phase module

Plug-in contact

Provides a maximum of service friendlinessSINAMICS SM150

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Components




Provides a maximum of service friendlinessSINAMICS SM150: Competitor:

The closed-loop control modules can be more quickly replaced thanks to the modular plug-in system

It is complicated to replace the control modules

SINAMICS SM150

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Components




Thank you very much for your attention.

sm150 advantage vs competitor a - gongkongftp.gongkong.com/uploadfile/datum/2008-6...slides: 3...

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