Power efficiency and digital communication of phase-controlled rectifiers for industrial uninterruptible power supply systems | Енергетска ефикасност и дигитална комуникација фазно регулисаних исправљача за индустријске системе беспрекидног напајања
2011
Вукић, В., Eлектротехнички институт Никoлa Teслa, Бeoгрaд (Serbia)
In this paper аre presented line-frequency phase-controlled rectifiers with digital control units developed in Institute Nikola Tesla, Belgrade (Serbia). Digital control units of the type DRI 07 are based on microcontroller Intel 80C196KB16. Implemented technical solutions are described, with emphasis on capabilities to establish digital communication with a central process computer implementing standard industrial communication protocols. Electrically isolated half-duplex serial communication of RS-485 standard enables easy connection of numerous, mutually remote rectifiers with one programmable logic controller adjusted for the conversion of communication protocols, also as further proceeding of data on the state of all rectifiers in a facility to the process control system. Results of the examinations of power factor, total current harmonic distortion and overall efficiency are presented. Comparison of procured results with corresponding data related to the rectifiers made by the leading west-european manufacturers. On phase-controlled rectifier rated for 90 kVA, loaded with 50% of its nominal current, overall efficiency of at least 96.6% was measured.
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