A guide for users of variable-speed drives (VSDs)
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The drive to reduce emissions and energy consumption
Variable-speed drives (VSDs) control the speed of machinery, pumps, mixers, fans and compressors to match the needs of the process. In many applications VSDs save so much energy that their economic payback time is only a matter of months. A new approach to the assessment of environmental impacts shows that the environmental payback time of VSDs can be even shorter, in many cases as little as on...
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Voltage sags originating in ac supply systems can cause nuisance tripping of variable speed drives (VSDs) resulting in production loss and restarting delays. In ac VSDs having an uncontrolled rectifier front-end, the effects of voltage sags on the dc link causing dc under-voltage or ac overcurrent faults initiate the tripping. This paper suggests modifications in the control algorithm in order ...
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Industrial motor-driven equipment accounts for more than two-thirds of industrial energy consumption, making their efficient electrical operation a vital component in factory expenses. The replacement of traditional drives with variable speed drives (VSDs) in motor-driven systems provides significant efficiencies that can translate to up to 40% in energy savings. Altera’s FPGA architectures pro...
متن کاملComparison between Electrical Drives in Lng Plant for Subsynchronous Torsional Interactions
Electrical drives for large capacity compressors in a liquefied natural gas (LNG) plant have been investigated. There are mainly two topologies for such an electrical drive; load commutated inverters (LCIs) and voltage source inverters (VSIs). Due to commutation of the thyristors, LCIs produce current harmonics with variable frequencies, and their interharmonics are significant. Therefore, tors...
متن کاملApplication of Speed Estimation Techniques for Induction Motor Drives in Electric Traction Industries and vehicles
Induction motors are the most commonly used in the traction industries and electric vehicles, due to their low primary cost, low maintenance costs, and good performance. Speed identification is needed for the induction motor drives. However, using of speed sensors in the induction motor drives is associated with problems such as, extra cost, reduced reliability, added mounting space, etc.. Ther...
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تاریخ انتشار 2001