Pulse width modulation schemes enabling single DC power source driven dual two-level voltage source inverter with single voltage source inverter switching

Three-level voltage space phasor can be obtained using a dual two-level voltage source inverter (VSI). Two zero sequence voltage elimination pulse width modulation (PWM) switching variants are proposed in this paper for complete elimination of zero sequence voltage (ZSV) in the dual-VSI scheme. Both...

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Bibliographic Details
Published in:IET power electronics 2014-05, Vol.7 (5), p.1181-1191
Main Authors: Srinivas, Srirama, Kalaiselvi, Jeyaraman
Format: Article
Language:English
Subjects:
Direct current
dual two‐level voltage source inverter
Electric potential
Inverters
look up table
losses
Mathematical analysis
Matlab
MATLAB‐SIMULINK simulation
Pulse duration modulation
pulse width modulation scheme
PWM invertors
PWM power convertors
PWM switching
reference space vector
single DC power source
single voltage source inverter switching
Switching
switching convertors
switching power loss
three‐level voltage space phasor
Voltage
VSI
zero sequence voltage elimination
ZSV
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Summary:Three-level voltage space phasor can be obtained using a dual two-level voltage source inverter (VSI). Two zero sequence voltage elimination pulse width modulation (PWM) switching variants are proposed in this paper for complete elimination of zero sequence voltage (ZSV) in the dual-VSI scheme. Both the PWM variants are designed in such a way that only one inverter is switched at any instant of time; to ensure that switching power losses in the dual-VSI is limited to one inverter only at any instant of time. Analytical expressions for the dwell times of the dual-VSI are developed and presented that successfully forces the ZSV in the dual-VSI to zero; at all instants of time. As a result, both the PWMs facilitate the dual-VSI to be driven from a single DC power source only. The implementation of the proposed PWM algorithms is greatly simplified and involves just the use of instantaneous magnitudes of the reference space vector. The implementation of PWMs totally avoids the time consuming task of sector identification and do not use look up tables. The PWMs proposed in this paper are first analysed, simulated using MATLAB/SIMULINK and then verified experimentally to validate the proposed PWMs.
ISSN:1755-4535
1755-4543
1755-4543
DOI:10.1049/iet-pel.2013.0283