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Capacitor-assisted active-switched quasi-Z-source inverters with high voltage gain

  • Anh-Tuan, Huynh (Department of Electrical Engineering, University of Ulsan) ;
  • Anh-Vu, Ho (School of Engineering, Eastern International University) ;
  • Tae-Won, Chun (Department of Electrical Engineering, University of Ulsan)
  • Received : 2022.08.15
  • Accepted : 2022.09.21
  • Published : 2022.12.20

Abstract

This paper presents a novel topology called the capacitor-assisted active-switched quasi Z-source inverter (CA/AS-qZSI). The proposed CA/AS-qZSI topology has a high ac voltage gain and low voltage and current stresses on the diodes and extra switch in the Z-network. The design guide of the passive elements used in the proposed topology and a comparative study of the proposed CA/AS-qZSI and four other topologies with an active-switched impedance network are addressed. A new pulse-width modulation (PWM) technique using a sawtooth carrier signal is also suggested to reduce the switching losses of the diodes and switches. Compared with the traditional simple boost control method, the efficiency of CA/AS-qZSI using the new PWM technique is improved by 4-4.6%. The experimental results utilizing a prototype made in the laboratory demonstrate the performance of the proposed CA/AS-qZSI and PWM technique.

Keywords

References

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