Danieli Automation
Danieli Automation MV-ML QDrives are Medium Voltage multi-level drives based on IGBT cascaded H bridges cells (CHB), in 3L NPC typology, air and water cooled no-regenerative type, with output voltage levels from 3.3 kV up to 11 kV and output power that ranges from 200 kVA (at 3.3kV) up to 13000 kVA (at 11 kV).

On supply line side, using multilevel conversion method with multi-windings transformers, the resulting multi-pulses input side current has a very low harmonics content and conforms easily to the IEEE519-1992 and IEC 61000 requirements, without having to use harmonic filters. On output side the motor friendly multi-level voltage waveform allows to convert easily existing fixed speed Direct On-Line Motors to a state of art Variable Speed Drive system, without requiring cumbersome sinusoidal filters to preserve motor insulation integrity. The CHB converter structure is realised using standardized power modules cells air or water cooled, in a easy to service and maintain modular structure. The cells could be easily extracted from the cabinet structure, on a supporting sliding system.
The basical drive configuration can be supplied also adding various options (Converter Bypass unit – Converter Synch. Bypass Unit - Output isolator unit) to fulfill special operational customer needs. The drive could be operated in scalar control, sensorless field oriented control and in sensored field oriented control (with encoder) to meet application drive system static and dynamic process requirements. Main applications are machines and plants in metal and in the process industry.