State-of-Charge Balancing Control for a Battery-Energy-Stored Quasi-Z-Source Cascaded-Multilevel-Inverter-Based Photovoltaic Power System

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

Research output: Contribution to journalArticle

28 Citations (Scopus)


A battery-energy-stored quasi-Z-source cascaded multilevel inverter (qZS-CMI)-based photovoltaic (PV) power generation system combines advantages of a qZS inverter, a CMI, and a battery energy storage system. However, unbalanced battery state of charge (SOC) between cascaded H-bridge inverter modules will degrade an entire system's performance and shorten battery lifespan. This paper proposes a control method to balance battery SOCs of all modules, no matter the intermittent states of each module's PV power. The method is on the basis of battery SOCs, SOC limits of each module, and the total power injected into the power grid. Simulation and experimental results verify the proposed control method that ensures identical SOCs for the battery-energy-stored qZS-CMI PV system.

Original languageEnglish
Article number8016600
Pages (from-to)2268-2279
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number3
Publication statusPublished - 1 Mar 2018



  • Battery energy storage (BES)
  • cascaded multilevel inverter (CMI)
  • quasi-Z-source inverter (qZSI)
  • solar power generation
  • state-of-charge (SOC) balancing

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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