An effective control method for quasi-Z-source cascade multilevel inverter-based grid-tie single-phase photovoltaic power system

Yushan Liu, Baoming Ge, Haitham Abu-Rub, Fang Z. Peng

Research output: Contribution to journalArticle

118 Citations (Scopus)


An effective control method, including system-level control and pulsewidth modulation for quasi-Z-source cascade multilevel inverter (qZS-CMI) based grid-tie photovoltaic (PV) power system is proposed. The system-level control achieves the grid-tie current injection, independent maximum power point tracking (MPPT) for separate PV panels, and dc-link voltage balance for all quasi-Z-source H-bridge inverter (qZS-HBI) modules. The complete design process is disclosed. A multilevel space vector modulation (SVM) for the single-phase qZS-CMI is proposed to fulfill the synthetization of the step-like voltage waveforms. Simulation and experiment based on a seven-level prototype are carried out to validate the proposed methods.

Original languageEnglish
Article number6587760
Pages (from-to)399-407
Number of pages9
JournalIEEE Transactions on Industrial Informatics
Issue number1
Publication statusPublished - Feb 2014



  • Cascade multilevel inverter (CMI)
  • photovoltaic (PV) power system
  • quasi-Z-source inverter
  • space vector modulation (SVM)

ASJC Scopus subject areas

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

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