Hybrid PWM Methods for Harmonic Reduction in Neutral Point Clamped Three-Level Inverter Drive for Pump Applications

Two hybrid PWM methods are proposed in this paper for a pump drive based on three-level Neutral-Point Clamped (NPC) inverter. The envisaged PWM methods are aimed at reducing output voltage harmonic distortion. While the first PWM method incorporates suitable voltage injection to the carrier signals,...

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Bibliographic Details
Published in:Electric power components and systems 2020-12, Vol.48 (14-15), p.1474-1487
Main Authors: Naganathan, Pratibha, Srinivas, Srirama
Format: Article
Language:English
Subjects:
Clamping
Electric potential
electrical drives
Fourier analysis
Harmonic analysis
Harmonic distortion
Harmonic reduction
induction motor drives
Induction motors
Inverters
Mathematical analysis
multilevel inverter
neutral point clamped inverter
Voltage
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Summary:Two hybrid PWM methods are proposed in this paper for a pump drive based on three-level Neutral-Point Clamped (NPC) inverter. The envisaged PWM methods are aimed at reducing output voltage harmonic distortion. While the first PWM method incorporates suitable voltage injection to the carrier signals, the second PWM method incorporates voltage injection to both carrier and the modulating signals for controlling the NPC drive. Detailed harmonic analysis is presented using Double Fourier Integral Approach (DFIA) for both the hybrid PWM methods by separately identifying their basic unit cells, their boundaries that demarcates different regions of inverter drive. Complete analytical expressions for dc, fundamental, carrier and side-band harmonic components present in the output voltage of the NPC drive are presented for both the hybrid PWM methods. The proposed PWM methods are simulated using Matlab/Simulink and are experimentally validated using an induction motor driven pump load, following V/f control. Superiority of the hybrid PWM methods in comparison to the existing PWM methods are demonstrated with v THD , weighted THD (v WTHD ), i THD , harmonic loss factor etc., supporting the envisaged PWM methods.
ISSN:1532-5008
1532-5016
DOI:10.1080/15325008.2020.1854379