Abstract
A space vector pulse-width modulation (SVPWM) algorithm for a three-level symmetrical six-phase drive, based on a vector space decomposition approach, is, for the first time, presented and experimentally proven in this paper. The process how to correctly select the optimal switching sequences, based on several starting requirements and conditions for the analyzed topology, such that the output phase voltage waveforms do not contain any low-order harmonics, is explained in detail. The developed SVPWM algorithm is verified experimentally using a three-level neutral-point-clamped converter and a symmetrical six-phase induction machine. Obtained results prove the validity of the developed SVPWM algorithm. The performance of the SVPWM algorithm is compared with the corresponding carrier-based modulation strategy, and it is shown that the two techniques yield identical performance. Finally, both simulation and experimental analysis of the voltage and current total harmonic distortion (THD) are reported.
Highlights
MULTILEVEL inverter supplied multiphase drives have been gaining interest of researchers and industries in recent years
Obtained results prove the validity of the developed SVPWM algorithm
The execution time of the initial implementation of SVPWM algorithm was 10 μs
Summary
MULTILEVEL inverter supplied multiphase drives have been gaining interest of researchers and industries in recent years. Since the space vector modulation algorithm depends on n and l, the process of determining the right switching sequences for multiphase multilevel topologies becomes more complex As it will be shown in this paper, the implementation of the SVPWM strategy in practice is rather simple. The modulation strategy for a multilevel multiphase drive is investigated and presented for the first time in [5], based on analysis of a three-level NPC inverter driving a five-phase induction motor. Since a PWM strategy for a three-level NPC inverter, regardless of the number of phases, can be realised using PD-PWM with ‘double min-max injection’ [2, 15, 16], a performance comparison between the SVPWM and PD-PWM in terms of the voltage and current THD, as well as execution time, is reported in this paper.
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