ROBICON Perfect Harmony Power Control Systems

In the ROBICON Perfect Harmony, a series of low voltage cells are linked together to build the medium voltage power output of the drive system. With this topology, the drive can be scaled precisely for a very wide range of voltage and output power. Additionally, the ROBICON Perfect Harmony offers increased availability because of its modular design and ability to bypass any one cell during operation while maintaining the full output voltage.

Furthermore, the integral transformer with phase-shifted secondaries provides 18-pulse or better input harmonic cancellation with a power factor above .95 under any operating conditions. This eliminates the need for input harmonic filters or power factor compensation, while completely avoiding any common-mode voltages from being imposed on the motor. The quality of the output voltage is so close to perfect sine-wave shape that motors of literally any type – old or new, low-speed or high-speed – can be operated without any additional stress. Issues related to dV/dt, overheating and increased torsion vibrations are a thing of the past.

ROBICON Perfect Harmony - Customer benefits

• Very small footprint
• No output transformer required – motor voltage 2.3 to 13.8 kV can be provided directly
• No harmonic line filters or power factor compensation required
• Engineered to continue operating through component failures that would completely disable conventional drives. The patented cell-based configuration maximizes availability, letting the customer determine the right time to perform maintenance, while the modular design reduces system repair time to minutes.
• The cell bypass option ensures automatic bypass of a failed power cell in typically 450 milliseconds or less (less than 1/2 of a second) through a redundant bypass control that is completely separated from each power cell
• The optional process-tolerant protection system (ProToPS®) in combination with cell bypass supports the high reliability and availability of the Robicon Perfect Harmony. Instead of tripping the drive and automatically shutting down the system due to a malfunction, ProToPS provides a hierarchical system of warnings. This control strategy allows time to evaluate the situation and respond appropriately to avoid a system shutdown.
• No common mode motor insulation stress – the Robicon Perfect Harmony includes an integral isolation transformer
• Compatible with both new and existing 1.0 service factor induction or synchronous motors from any manufacturer without any special design considerations
• No significant drive-induced torque pulsations – even at low speeds
• No need for expensive flexible couplings
• No cable length restrictions

Robicon Product Features

400 to 90,000 HP

• Low Harmonic Input
• Near Utility Power Factor
• Higher Overall System Efficiency
• “Motor Friendly” Output
• Enhanced Availability
• Lower Installed Cost
• Improved Control

Downloads:

Robicon Perfect Harmony Drive product presentation. (PDF - 3MB)

For more information, go to the Siemens Robicon Perfect Harmony website.