Improved Modulation Methods of the Dual-inverter Fed Open-end Winding Three-phase Motor Drives with Equal DC-link Voltage

I Nyoman Wahyu  Satiawan; Ida Bagus Fery Citarsa; Warindi; I Ketut Wiryajati; Supriono; Ni Made Seniari; I Made Budi Suksmadana

doi:10.31258/ijeepse.5.3.93-98

I Nyoman Wahyu Satiawan University of Mataram, Indonesia
Ida Bagus Fery Citarsa University of Mataram, Indonesia
Warindi University of Mataram, Indonesia
I Ketut Wiryajati University of Mataram, Indonesia
Supriono University of Mataram, Indonesia
Ni Made Seniari University of Mataram, Indonesia
I Made Budi Suksmadana University of Mataram, Indonesia

DOI: https://doi.org/10.31258/ijeepse.5.3.93-98

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Keywords: Dual-inverter fed, Modulation technique, Open-end winding, PWM

Abstract

This paper investigates PWM method for the dual-inverter fed open end winding three-phase induction motor drives. This is aimed to improve the quality of the output voltage as well as to enhance the motor performance by solving the drawback of the PWM method. The proposed PWM method operates two inverters in different technique, i.e one inverter operates in square wave mode (slow switching) and one inverter in PWM mode (fast switching). Although the PWM method can improve the quality of the inverter output voltage over the two-level inverter output, the proposed PWM method causes an excessive ripple in both torque and stator current especially at the transient period. The drawback is solved by applying a new switching strategy that manage the inverter switches operate in turn between slow switching and fast switching in one circle of operation. The proposed method is verified via simulation. The result shows that the quality of output voltages improves for all modulation indices in comparison with two-level inverter. Furthermore, torque ripple is reduced, and current ripple are improved as the current waveform is enhanced to be more symmetrical.

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