Abshocl-Many industrial plants rcly on Adjustable Speed Driver (ASD) for critical process applications. However, most ASD are susceptible to power disturbances, specially voltage sags and momentary interruptions. ASD tripping in industrial process can he very costly due to defective units produced BP well as production down time.This paper presents an Ultracapaeitor-Based Ride-Through System for Adjustable Speed Drives Applied to critical Process. The complete system is composed by an Unificld Power Qualyti Conditioner (UPQC) and a two-quadrant Chopper.
PO box: 6101 ZIP CODE : 13081-970 Campinas-SP -Brazil PO box: 50 ZIP CODE : 37500-903 Itajubi-MG -Brazil ABSTRACT -The alternating current (AC) of line commutated converters is non-sinusoidal, generating, therefore, harmonics in the electric system.Sir-pulse graetz line-commutated converters are widely employed in industry. Twelvepulse converter can be achieved by associating two sir-pulse converters in series or in parallel. However it is necessary to use supply transformers, These transformers are connected in such a way that the secondary voltage phase angles are displaced thirty degrees in relation IO each other. Lower order characteristic harmonics are eliminated in this case (Y, 7"). rendering these transformers BS adequate for the proposed application.A very good harmonic mitigation can be obtained when 24 or 48 -pulse multiconverters are employed, by associating four or eight graeh six -pulse converters, respectively. When the Converter pulse number is increased there will be also, a system power factor improvement. Experimental results will be presented and discussred.
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