Robicon Perfect Harmony

Robicon Perfect Harmony - Largest selling MV drive - 5000 installed - IGBT based - 2.4 to 13.8kV - 70-1400A - Air or liquid cooled - Inherently low harmonics - Modular construction - Built-in redundancy - Up to 60MW

Robicon Perfect Harmony THE PERFECT HARMONY CONCEPT

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

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

Voltage Source Converter INPUT TRANSFORMER MOTOR RECTIFIER DC LINK CAPACITOR INVERTER

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

Power Cell

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

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

The Perfect Harmony Concept – Power Schematic

The Perfect Harmony Concept – Motor Waveform

The Perfect Harmony Concept – Power Cell

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

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

The Perfect Harmony Concept – Output Waveform Pulse Width Modulated Waveform

The Perfect Harmony Concept – Motor Compatibility

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

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

The Perfect Harmony Concept – Ride Through Capability

The Perfect Harmony Concept – Ride Through Capability

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

The Perfect Harmony Concept – Power Quality

The Perfect Harmony Concept – Energy Saving - Typical efficiency of 96.5% from power in to power out - .95 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

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

The Perfect Harmony Concept – Cell Bypass

The Perfect Harmony Concept – Cell Bypass 95 132.5 o A B C VAC VBA VCB A3 A2 A1 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5

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

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

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

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

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

Title of the presentation Thank you Title of the presentation Name: Renash Rampersadh Department: Drive Technology Address: 300 Janadel Ave Halfway House Phone: +11 652 2685 Mail: renash.rampersadh@siemens.com