An energy stored Quasi-Z-Source cascade multilevel inverter-based photovoltaic power generation system

Dongsen Sun, Baoming Ge, Weihua Liang, Haitham Abu-Rub, Fang Zheng Peng

Research output: Contribution to journalArticle

101 Citations (Scopus)


The quasi-Z-source cascade multilevel inverter (qZS-CMI) presents many advantages over conventional CMI when applied in photovoltaic (PV) power systems. For example, the qZS-CMI provides the balanced dc-link voltage and voltage boost ability, saves one-third modules, etc. However, the qZS-CMI still cannot overcome the intermittent and stochastic fluctuation of solar power injected to the grid. This paper proposes an energy stored qZS-CMI-based PV power generation system. The system combines the qZS-CMI and energy storage by adding an energy stored battery in each module to balance the stochastic fluctuations of PV power. This paper also proposes a control scheme for the energy stored qZS-CMI-based PV system. The proposed system can achieve the distributed maximum power point track for PV panels, balance the power between different modules, and provide the desired power to the grid. A detailed design method of controller parameters is disclosed. Simulation and experimental results verify the proposed system and the control scheme.

Original languageEnglish
Article number7051248
Pages (from-to)5458-5467
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Issue number9
Publication statusPublished - 1 Sep 2015



  • Cascade multilevel inverter
  • energy storage
  • photovoltaic power generation
  • quasi-Z source inverter

ASJC Scopus subject areas

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

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