Enhanced performance modified discontinuous PWM technique for three phase Z-source inverter

Ahmed A. Hossameldin, Ahmed K. Abdelsalam, Ahmed A. Ibrahim, Barry Williams

Research output: Contribution to journalArticle

Abstract

Various industrial applications require a voltage conversion stage from DC to AC. Among them, commercial renewable energy systems (RES) needs a voltage buck and/or boost stage for islanded/grid connected operation. Despite of the excellent performance offered by conventional two-stage converter systems (dc-dc followed by dc-ac stages), the need of single stage conversion stage is attracting more interest for cost and size reduction aspects. Although voltage source inverters (VSIs) are voltage buck only converters, single stage current source inverters (CSIs) can offer voltage boost features yet at the penalty of using large DC-link inductor. Boost inverters present a good candidate with the demerit of complicated control strategies. Impedance source (Z-source) inverter is a high-performance competitor as it offers voltage buck/boost with reduced passive component size in addition. Several pulse width modulations (PWM) techniques have been presented in literature for three phase Z-source inverters. Various common drawbacks are annotated, especially the non-linear behavior at low modulation indices and the famous trade-off between the operating range and the converter switches’ voltage stress. In this paper, a modified discontinuous PWM technique is proposed for three phase z-source inverter offering: (i) smooth voltage gain variation, (ii) wide operating range, (iii) reduced voltage stress, and (iv) improved total harmonic distortion (THD). Simulation in addition to experimental results at various operating conditions validates the proposed PWM technique superior performance
compared to the conventional PWM techniques.
Original languageEnglish
Article number578
Number of pages18
JournalEnergies
Volume13
Issue number3
DOIs
Publication statusPublished - 26 Jan 2020

Fingerprint

Inverter
Pulse width modulation
Modulation
Voltage
Electric potential
Converter
Renewable Energy
Harmonic distortion
Industrial Application
Range of data
Impedance
Industrial applications
Penalty
Control Strategy
Switch
High Performance
Harmonic
Trade-offs
Switches
Grid

Keywords

  • Z-Source inverter
  • impedance source inverter
  • pulse width modulation
  • PWM
  • simple boost
  • maximum boost
  • constant boost
  • space vector
  • discontinuous PWM and DC-AC converter

Cite this

Hossameldin, Ahmed A. ; Abdelsalam, Ahmed K. ; Ibrahim, Ahmed A. ; Williams, Barry. / Enhanced performance modified discontinuous PWM technique for three phase Z-source inverter. In: Energies. 2020 ; Vol. 13, No. 3.
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Enhanced performance modified discontinuous PWM technique for three phase Z-source inverter. / Hossameldin, Ahmed A. ; Abdelsalam, Ahmed K.; Ibrahim, Ahmed A. ; Williams, Barry.

In: Energies, Vol. 13, No. 3, 578, 26.01.2020.

Research output: Contribution to journalArticle

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AB - Various industrial applications require a voltage conversion stage from DC to AC. Among them, commercial renewable energy systems (RES) needs a voltage buck and/or boost stage for islanded/grid connected operation. Despite of the excellent performance offered by conventional two-stage converter systems (dc-dc followed by dc-ac stages), the need of single stage conversion stage is attracting more interest for cost and size reduction aspects. Although voltage source inverters (VSIs) are voltage buck only converters, single stage current source inverters (CSIs) can offer voltage boost features yet at the penalty of using large DC-link inductor. Boost inverters present a good candidate with the demerit of complicated control strategies. Impedance source (Z-source) inverter is a high-performance competitor as it offers voltage buck/boost with reduced passive component size in addition. Several pulse width modulations (PWM) techniques have been presented in literature for three phase Z-source inverters. Various common drawbacks are annotated, especially the non-linear behavior at low modulation indices and the famous trade-off between the operating range and the converter switches’ voltage stress. In this paper, a modified discontinuous PWM technique is proposed for three phase z-source inverter offering: (i) smooth voltage gain variation, (ii) wide operating range, (iii) reduced voltage stress, and (iv) improved total harmonic distortion (THD). Simulation in addition to experimental results at various operating conditions validates the proposed PWM technique superior performancecompared to the conventional PWM techniques.

KW - Z-Source inverter

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