MVC Medium-Voltage Variable Frequency Drive, 200-15000 kVA

The MVC (RMVC) medium-voltage drive uses an AC-DC-AC voltage-source, multilevel topology with sensorless vector control, and drives standard high- and medium-voltage motors without special requirements. Multi-pulse phase-shifting rectification keeps harmonics low and the power factor above 0.95.

Long-life, maintenance-free dry film capacitors are used throughout. Air-cooled and water-cooled versions are available, the equipment is tested and certified by TUV Rheinland, and it is exported to 35 countries and regions.

Key Specifications

Applications

Petroleum, coal, chemicals, metallurgy, power, mining, building materials, water conservancy, municipal utilities and test stations.

Documents Supplied

For each order we can provide the technical data sheet, outline drawing, routine test report and, for explosion-proof equipment, a copy of the Ex certificate that matches the nameplate marking. Tell us in the inquiry which documents your project or your inspector requires, so they are prepared before shipment.

Related Products

• OLI-Wolong MVE Vibration Motors, Standard & ATEX
• High-Power Water-Cooled Frequency Converter
• High-Voltage Solid-State Soft Starter

How the RMVC Works

The RMVC is a cascaded H-bridge (multilevel PWM) drive. Each phase is a stack of identical low-voltage IGBT power cells; each cell is fed from its own secondary of a multi-winding phase-shifting transformer. Example: the 10 kV unit uses 8 cells per phase, 24 cells in total, on a 48-pulse transformer, giving a 33-level line-to-line output. A 6 kV unit uses 30-pulse rectification.

• Input power factor above 0.95 at any speed and load, input harmonics within IEEE 519, no filter or power-factor correction needed
• Near-sinusoidal output current: no extra motor heating or torque ripple, works with standard motors and cables
• Low dv/dt and low switching amplitude: less stress on motor insulation, less bearing current, no sine filter except with very long cables
• Direct medium-voltage output without an output transformer, up to 13.8 kV motors and 20 MW and more
• Modular cells, identical in design, with built-in protection and optional cell bypass
• Fibre-optic links between the main controller and the cells; touch-screen HMI with fault diagnosis, parameter setting, data logging and user levels
• Dry-type or oil-immersed phase-shifting transformer; air or water cooling (water-cooled units up to 40 MVA at 10 kV, 3300 / 4500 V IGBTs)

In industrial service since 2005, the series is well suited to retrofit projects where an existing fixed-speed fan, pump or compressor motor is converted to variable speed.

Common Questions

What power range does the MVC cover?

The MVC covers 200 - 15,000 kVA.

Which voltages are available for the MVC?

Rated voltage: 3 - 35 kV. Other voltages can be checked on request.

How to Order

For a fast, accurate quotation please send: rated power (kW), voltage and frequency, motor rating and load type, supply voltage, hazardous-area requirements, quantity and destination port. For a replacement, a photo of the old motor nameplate is the quickest way to match it. Lead time (about 80 days), documents and shipping are explained on our Export Service page.