June 26, 2011
June 26, 2011
June 29, 2011
Energy Conversion and Conservation
22.487.1 - 22.487.18
Development of an Input Power Factor Corrected Variable Speed Motor Drive System for the Electric Motor Drives Course AbstractAn active input power factor correction (IPFC) is introduced as a front-end converter for thevariable speed induction motor drive system. This paper provides for the improvement of thesystem power quality which involves high power factor (PF) and low total harmonic distortion(THD). The necessity for efficient utilization of generated electrical energy is growing insignificance in order to optimize the usage of utility power plant capacity. Moreover theawareness to minimize harmonic contamination in the electric power line is rising due to theincreased use of electronic equipment powered by an ac-to-dc bridge rectifier with large filtercapacitors and/or the switch-mode power supply. The variable speed motor drive (VSMD) saveselectrical energy over the fixed motor drive under the assumption that both are operating on thesame load factor. Almost all of the small VSMDs have no IPFC circuits to save their productioncosts. Emerging applications of fractional horsepower induction motor drives (IMDs), such ascompressors, appliances, blowers, hand tools, and heating, ventilating, and air-conditioning(HVAC), invoke the urgency of study on effects of the IPFC on the VSMDs. A three-phaseinverter-fed IMD with single-phase source and an active IPFC circuit is proposed in this paper tostudy the impact of IPFC circuit experimentally. The foremost subject in the study of an input PFcorrected VSMD are effects of IPFC circuit on the overall system efficiency and input PF.Empirical comparisons between the conventional bridge rectifier circuit and IPFC circuit interms of PF and efficiency against motor speed are developed. A steady-state model of the IMDincluding a three-phase inverter and an active IPFC circuit is developed to predict the systemperformance. The analytical results are correlated to the experimental results obtained from aprototype one-horsepower IMD with the constant volts per hertz (V/Hz) control strategy. Theoverall system performance with an IPFC circuit is better than the system performance without itin terms of harmonic contents and PF. The system efficiency, however, shows marginalinferiority with an IPFC circuit because the front-end IPFC circuit and the three-phase inverterare connected serially. It should be emphasized that the IMD with IPFC is desirable to utilize thegenerated electrical energy effectively and minimize the harmonic contamination. Thedeveloped system may be useful as a hands-on experiment for the Electric Motor Drives course.In conclusion, various teaching components are defined with the developed input PF correctedVSMD system.
Lee, S. (2011, June), Development of an Input Power Factor Corrected Variable Speed Motor Drive System for the Electric Motor Drives Course Paper presented at 2011 ASEE Annual Conference & Exposition, Vancouver, BC. 10.18260/1-2--17768
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