Flux-Balancing Scheme for PD-Modulated Parallel-Interleaved Inverters

Ghanshyamsinh Vijaysinh Gohil, Lorand Bede, Remus Teodorescu, Tamas Kerekes, Frede Blaabjerg

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28 Citationer (Scopus)

Abstract

A simple scheme to realize Phase-Disposition carrier Pulse Width Modulation (PD PWM) for parallel Two-Level Voltage Source Converters (2L-VSCs) is presented in this paper. The proposed implementation only uses a single carrier signal and can easily be implemented using a digital signal processor. The operation of the parallel VSCs with the Coupled Inductor (CI), under the PD PWM is briefly discussed and the associated dc flux injection problem is investigated. A CI saturation issue during the band transition under the PD PWM scheme is also explored and the strategy to avoid this problem is presented. In addition, the proposed strategy also maintains a volt-sec balance to synthesize desired reference space voltage vector during the band transition. As a result, a smooth transition from one modulation band to the other is ensured without causing disturbances in the line-to-line voltage. The switching losses and the harmonic performance of the proposed implementation are also compared with the commonly used Phase-Shifted carrier Pulse Width Modulation (PS PWM). The implementation issues are discussed and the experimental results are also presented.
OriginalsprogEngelsk
TidsskriftIEEE Transactions on Power Electronics
Vol/bind32
Udgave nummer5
Sider (fra-til)3442 - 3457
Antal sider16
ISSN0885-8993
DOI
StatusUdgivet - maj 2017

Emneord

  • Coils
  • Inductors
  • Power conversion
  • Pulse width modulation
  • Switches
  • PD modulation
  • Voltage source converters (VSC)
  • coupled inductor
  • interleaving
  • parallel
  • parallel inverters
  • phase disposition modulation
  • pulse width modulation

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