Title :
Neutral shift [five years of continuous operation with adjustable frequency drives]
Author :
Eaton, Dan ; Rama, John ; Hammond, Pete
Author_Institution :
Marathon Ashland Pet. Co., Cattlesburg, KY, USA
Abstract :
The combined efforts of the AFD supplier and end-user have resulted in an extremely reliable electrical adjustable speed drive system. Almost three years into the run of the first unit, all parties are confident of the ability to meet the five-year run target that was identified at the outset. The redundancy of the power cells in this particular design, together with the neutral shift control has practically eliminated the power components as a source of operational failure. Future development efforts will include applying redundancy and fault tolerance to the drive control processor to further enhance system reliability.
Keywords :
closed loop systems; compressors; fault tolerance; redundancy; reliability; variable speed drives; adjustable frequency drives; closed-loop system; continuous operation; drive control processor; energy conservation; environmental compliance; fault tolerance; improved product yield; modular multilevel series-cell type; neutral shift control; operational failure; reduced maintenance costs; redundancy; reliable electrical drive system; single-stage centrifugal compressor; system reliability; technology evaluation; wet gas compressors; Costs; Fault tolerance; Insulated gate bipolar transistors; Power system reliability; Production systems; Risk analysis; Rotating machines; Switches; Thyristors; Velocity control;
Journal_Title :
Industry Applications Magazine, IEEE
DOI :
10.1109/MIA.2003.1245795
