Control system design of battery-assisted quasi-z-source inverter for grid-tie photovoltaic power generation

Yushan Liu, Baoming Ge, Haitham Abu-Rub, Fang Zheng Peng

Research output: Contribution to journalArticle

78 Citations (Scopus)


A control strategy for the quasi-Z-source inverter (qZSI) with a battery-based photovoltaic (PV) power conversion system is proposed. A battery-assisted qZSI can buck/boost PV panel voltage by introducing shoot-through states, and make full use of PV power by the energy-stored battery paralleled to the quasi-Z-source capacitor. A dynamic small-signal model of the battery-assisted qZSI is established to design a closed-loop controller for regulating shoot-through duty ratio and managing the battery's energy storage. A modified space vector modulation (SVM) technique for the qZSI is applied to achieve low harmonics, high voltage utilization, and high efficiency. A P-Q decoupled grid-tie power injection is fulfilled with the maximum power capture from PV panels and the unity power factor. The validity of the proposed PV system is proved by experimental results, showing an efficient method for the energy-stored PV power generation.

Original languageEnglish
Article number6521420
Pages (from-to)994-1001
Number of pages8
JournalIEEE Transactions on Sustainable Energy
Issue number4
Publication statusPublished - 31 May 2013



  • Energy storage
  • grid-tie photovoltaic (PV) power system
  • quasi-Z-source inverter (qZSI)
  • space vector modulation (SVM)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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