Advances in High Power Industrial AC Drives and their Control

摘要

The power ratings of large medium voltage (2.2 kV-13.8 kV) industrial drives range between few hundred kilowatts to a few tens of megawatts. The upper limit is decided by the requirements of the applications rather than by the technology of the converters and machines. The available speed range lies from 10 rpm for low speed machines (e.g. Cement mills), 1500/3000 rpm for normal speed drives to even 18000 rpm for very high speed drives (compressors). The limits for the DC motors such as cost, size, commutator problems and inability to operate satisfactorily in a dirty and explosive environment have called for AC motor drives for high power applications.