### 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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