Double-Line-Frequency Ripple Model, Analysis, and Impedance Design for Energy-Stored Single-Phase Quasi-Z-Source Photovoltaic System

Weihua Liang, Yushan Liu, Baoming Ge, Haitham Abu-Rub, Robert Balog, Yaosuo Xue

Research output: Contribution to journalArticle

14 Citations (Scopus)


The battery energy-stored quasi-Z-source (BES-qZS)-based photovoltaic (PV) power generation system combines advantages of the qZS inverter and the battery energy storage system. However, the second-harmonic (2ω) power ripple degrades the system's performance and affects the system's design. An accurate model to analyze the 2ω ripple is very important. The existing models did not consider the battery, or assumed a symmetric qZS network with L-1= L-2 and C-1= C-2, which limits the design freedom and causes oversized impedance parameters. This paper proposes a comprehensive model for the single-phase BES-qZS-PV inverter system, where the battery is considered and there is no restriction of L-1= L-2 and C-1= C-2. Based on the built model, a BES-qZS impedance design method is proposed to mitigate the 2ω ripple with asymmetric qZS network. Simulation and experimental results verify the proposed 2ω ripple model and impedance design method.

Original languageEnglish
Article number8030146
Pages (from-to)3198-3209
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number4
Publication statusPublished - 1 Apr 2018



  • Battery energy storage
  • photovoltaic power system
  • quasi-Z-source inverter
  • second-harmonic ripple model

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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