An Active Filter Method to Eliminate DC-Side Low-Frequency Power for a Single-Phase Quasi-Z-Source Inverter

Baoming Ge, Yushan Liu, Haitham Abu-Rub, Robert Balog, Fang Zheng Peng, Hexu Sun, Xiao Li

Research output: Contribution to journalArticle

42 Citations (Scopus)


The second harmonic pulsating power flows through the dc side of a single-phase quasi-Z-source inverter (qZSI), which requires bulky capacitor banks and inductors to suppress low-frequency ripple of dc-link voltage and inductor currents in the passive ripple reduction way. However, the resultant huge qZS network seriously deteriorates the system reliability, efficiency, volume, weight, and cost. This paper proposes an active-filter-integrated single-phase qZSI to transfer low-frequency power ripple directly from ac load to active filter's ac capacitor, so that low-frequency power ripple does not present in dc side anymore and constant inductor currents and constant capacitor voltages are ensured. Thus, much small qZS impedance is employed to only smooth high-frequency ripple and active filter's capacitor supports ac voltage (large ripple allowed) with small capacitance. The operation principle, parameter design method, and modeling and control strategy of the proposed topology are investigated. Comparative evaluation, simulation, and experimental results verify the proposed new topology system.

Original languageEnglish
Article number7448902
Pages (from-to)4838-4848
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number8
Publication statusPublished - 1 Aug 2016



  • Active filter
  • quasi-Z-source inverter
  • second harmonic pulsating power
  • single-phase system

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering

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