1. Robicon
Perfect Harmony

2. Robicon Perfect Harmony
- Largest selling MV drive
installed
- IGBT based
- 2.4 to 13.8kV A
- Air or liquid cooled
- Inherently low harmonics
- Modular construction
- Built-in redundancy
- Up to 60MW

3. Robicon Perfect Harmony
THE PERFECT HARMONY
CONCEPT

4. The Pefect Harmony Concept
CONVERTER
SUPPLY
TRANSFORMER
HARMONIC
FILTER
DC LINK
REACTOR
MOTOR
CONVENTIONAL DESIGN
SUPPLY
TRANSFORMER
CONVERTER
PERFECT HARMONY

5. The Ideal Variable Speed Drive
Driven
Load
Supply
Network
Variable
Speed drive
Motor
No harmonic
voltage or
current distortion
Near unity
power factor
Fault tolerant,
enabling operation
after component
failure
Small footprint
Easy repair
High efficiency
No harmonic
heating
No insulation
stress
No additional
bearing current
No rotational
torque
oscillations

6. Voltage Source Converter
INPUT
TRANSFORMER
MOTOR
RECTIFIER
DC LINK
CAPACITOR
INVERTER

7. The Perfect Harmony Concept
Dedicated winding
on power transformer
Power Output of Cell
Logic
Control
Power
Fiber Optic Signals to
and from master control
Logic Control Circuits

8. Power Cell

9. The Perfect Harmony Concept
630 V
3800V
6600V
These cells are in
phase at zero degrees
electrical
These cells are in
phase at 120 degrees
electrical
These cells are in
phase at 240 degrees
electrical

10. The Perfect Harmony Concept
1375 V
8000V
13800V
These cells are in
phase at zero degrees
electrical
These cells are in
phase at 120 degrees
electrical
These cells are in
phase at 240 degrees
electrical

11. The Perfect Harmony Concept – Power Schematic

12. The Perfect Harmony Concept – Motor Waveform

13. The Perfect Harmony Concept – Power Cell

14. The Perfect Harmony Concept – Application Issues
- Motor compatibility
- Power line immunity
- Power quality
- Energy saving
- Reliability

15. The Perfect Harmony Concept – Motor Compatibility
No additional VFD induced motor heating
Converter can safely be applied to a standard motor
Compatible with both new and existing motors
No insulation problems
Converter creates no motor dV/dt insulation stress
No common mode insulation stress
Converter generates no additional bearing currents

16. The Perfect Harmony Concept – Output Waveform
Pulse Width Modulated Waveform

17. The Perfect Harmony Concept – Motor Compatibility

18. The Perfect Harmony Concept – Motor Compatibility
Effects of dV/dt on motor windings
Competitor’s Waveform

19. The Perfect Harmony Concept – Motor Compatibility
Paths for bearing currents and their effect

20. The Perfect Harmony Concept – Ride Through Capability

21. The Perfect Harmony Concept – Ride Through Capability

22. The Perfect Harmony Concept – Power Quality
- Near zero supply side harmonics
- Meets all new requirements of IEEE 519 for
both current and voltage distortion
- Eliminates the need to do harmonic analysis
- Eliminates costly harmonic filters required for
distortion control

23. The Perfect Harmony Concept – Power Quality

24. The Perfect Harmony Concept – Energy Saving
- Typical efficiency of 96.5% from power in to power out
or better power factor over the entire speed ran
- No external power factor correction capacitors required
- Eliminates utility penalties
- High efficiency over the whole speed range
- No energy wasting harmonic filter required

25. The Perfect Harmony Concept – Cell Bypass
630 V
3800V
6600V
Allows operation at
reduced power/speed
Automatic bypass
of failed cell
Neutral Shift

26. The Perfect Harmony Concept – Cell Bypass

27. The Perfect Harmony Concept – Cell Bypass95
132.5 o A B C
VAC
VBA
VCB A3 A2 A1 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5

28. The Perfect Harmony Concept – Cell Bypass
61.6
61.1 C B A
VBA
VAC
VCB

29. The Perfect Harmony Concept – Reliability
- Air cooled models have redundant cooling
fans with automatic changeover
- Water cooled models have redundant water
pumps with automatic changeover

30. The Perfect Harmony Concept – The Proof
- 3.7MW Wet Gas Compressor
- Refinery Duty
- 5 Years Guaranteed Trip Free operation
- Started End of 2000
- Three Year Expected Payback on Investment
- Improved Surge Control
- Maintenance extended to 6 years

31. The Perfect Harmony Concept – Ease of Maintenance
- Low voltage Power Cell construction
- Modular draw-out Power Cells
- Bypassed cell can be changed when convenient
- Microprocessor-based diagnostics
- Historical operational and fault reports

32. The Perfect Harmony Concept
Motor compatibility
Power line immunity
Power quality
Energy saving
Reliability

33. Title of the presentation
Thank you
Title of the presentation
Name: Renash Rampersadh
Department: Drive Technology
Address: 300 Janadel Ave
Halfway House
Phone:
Mail: