PWM Strategies for Multilevel Inverter and Dc Link Capacitor Voltage Balancing For an Induction Motor Drive

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Mr. Srinivas Dasam
Mr. Srinivas Dasam
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Dr. Srinivas Dasam
Dr. Srinivas Dasam
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Dr BVSankerram
Dr BVSankerram

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GJRE Volume 12 Issue F5

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Multilevel PWM techniques are extensions of twolevel PWM methods; the multiple levels in these inverters offer extra degrees of freedom and greater possibilities in terms of device utilization and effective switching frequency. Though the SPWM and its variations are popular PWM techniques in multilevel inverters, implementing them in a digital platform is tedious, as the pulse-widths can only be defined by transcendental equations. A dc link capacitor voltage balancing scheme is proposed for an induction motor drive. The motor is fed from with threelevel inverters generating a five level output voltage structure. The proposed inverter vector locations exhibit multiplicity in the inverter switching combinations which is suitably exploited to arrive at a capacitor voltage balancing scheme. This allows the use of a single dc link power supply for the combined inverter structure. The lower order harmonic components in the output voltage waveform are eliminated by raising the carrier frequency.

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No external funding was declared for this work.

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The authors declare no conflict of interest.

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No ethics committee approval was required for this article type.

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Not applicable for this article.

Mr. Srinivas Dasam. 2012. \u201cPWM Strategies for Multilevel Inverter and Dc Link Capacitor Voltage Balancing For an Induction Motor Drive\u201d. Global Journal of Research in Engineering - F: Electrical & Electronic GJRE-F Volume 12 (GJRE Volume 12 Issue F5): .

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Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

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May 3, 2012

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English

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Multilevel PWM techniques are extensions of twolevel PWM methods; the multiple levels in these inverters offer extra degrees of freedom and greater possibilities in terms of device utilization and effective switching frequency. Though the SPWM and its variations are popular PWM techniques in multilevel inverters, implementing them in a digital platform is tedious, as the pulse-widths can only be defined by transcendental equations. A dc link capacitor voltage balancing scheme is proposed for an induction motor drive. The motor is fed from with threelevel inverters generating a five level output voltage structure. The proposed inverter vector locations exhibit multiplicity in the inverter switching combinations which is suitably exploited to arrive at a capacitor voltage balancing scheme. This allows the use of a single dc link power supply for the combined inverter structure. The lower order harmonic components in the output voltage waveform are eliminated by raising the carrier frequency.

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PWM Strategies for Multilevel Inverter and Dc Link Capacitor Voltage Balancing For an Induction Motor Drive

Dr. Srinivas Dasam
Dr. Srinivas Dasam
Dr BVSankerram
Dr BVSankerram

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