Vol 6, No 6 (2015) > Electrical, Electronics and Computer Engineering >

An Analysis of Voltage Space Vectors’ Utilization of Various PWM Schemes in Dual-inverter Fed Five-phase Open-end Winding Motor Drives

I Nyoman Wahyu Satiawan, Ida Bagus Fery Citarsa, I Ketut Wiryajati, I Kade Wiratama


Abstract: This paper analyzes
voltage space vectors’ utilization of various Pulse Width Modulation (PWM)
schemes in dual-inverter fed five-phase open-end winding motor drives with equal
DC-link voltage. The applied voltage space vectors in three PWM schemes were
examined. These three schemes were: the Equal Reference Sharing (ERS) PWM, the
Unequal Reference Sharing (URS) PWM, and the Decomposition PWM. The results of
these examinations show that the ERS scheme utilizes only 21 of the 211
available voltage vectors, and that the URS scheme utilizes more voltage
vectors than the ERS scheme. The number of vectors applied in the URS scheme
varies according to the modulation index and angular position of the voltage
references. Consequently, the URS scheme produces better voltage output quality
than the ERS scheme. Of the three schemes, the Decomposition PWM applies the
most effective voltage vectors and produces the best voltage output quality, which
is indicated by the lowest value of Total Harmonics Distortion (THD). This
paper also proposes a new switching strategy that inherently improves the power
sharing capability of the converter, thus avoiding the increase in the DC-link
voltage of inverter that operates in PWM mode.
Keywords: Decomposition PWM; Dual-inverter fed five-phase motor; Equal Reference Sharing (ERS); Unequal Reference Sharing (URS)

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