Abstract
This paper investigates certain novel switching sequences involving division of active vector time for space vectorbased pulsewidth modulation (PWM) generation for a voltage source inverter. This paper proposes two new sequences, and identifies all possible sequences, which result in the same average switching frequency as conventional space vector PWM (CSVPWM) at a given sampling frequency. This paper brings out a method for designing hybrid PWM techniques involving multiple sequences to reduce line current ripple. The three proposed hybrid PWM techniques (three-zone PWM, five-zone PWM and sevenzone PWM) employ three, five and seven different sequences, respectively, in every sector. Each sequence is employed in a spatial region within the sector where it results in the lowest rms current ripple over the given sampling period. The proposed techniques lead to a significant reduction in THD over CSVPWM at high line voltages. The five-zone technique results in the lowest THD among real-time techniques with uniform sampling, while the seven-zone technique is the best among real-time techniques with twin sampling rates. The superior harmonic performance of the proposed techniques over CSVPWM and existing bus-clamping PWM techniques is established theoretically as well as experimentally.
Original language | English (US) |
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Pages (from-to) | 1614-1627 |
Number of pages | 14 |
Journal | IEEE Transactions on Industrial Electronics |
Volume | 55 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2008 |
Keywords
- Harmonic analysis
- Harmonic distortion
- Hybrid PWM
- Induction motor drive
- PWM inverters
- Pulsewidth modulation (PWM)
- Space vector
- Space vector modulation
- Spread spectrum
- Stator flux ripple
- Switching sequences
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering