Modeling, impedance design, and efficiency analysis of quasi-Z source module in cascaded multilevel photovoltaic power system

Dongsen Sun, Baoming Ge, Xingyu Yan, Daqiang Bi, Hao Zhang, Yushan Liu, Haitham Abu-Rub, Lazhar Ben-Brahim, Fang Zheng Peng

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

The quasi-Z source (qZS) cascaded multilevel inverter (CMI) (qZS-CMI) presents attractive advantages in application to photovoltaic (PV) power system. Each PV panel connects to an H-bridge qZS inverter (qZSI) to form a power generation module. The distributed maximum power point tracking and all modules' dc-link peak voltage balance can be achieved. However, it is the same with the conventional CMI that the second-harmonic (2ω) voltage and current ripples exist in each qZSI module. It is crucial for a qZS-CMI to design the reasonable qZS network parameters to limit the ripples within a desired range. This paper proposes an analytic model to accurately calculate the 2ω voltage and current ripples of each qZSI module. A qZS impedance design method based on the built model is proposed to limit the 2ω ripples of dc-link voltage and inductor current. Simulated and experimental results through using the designed 1.5-kW prototype validate the proposed analytic model and the design method. Furthermore, this paper analyzes all of the operating states for a qZSI module and calculates the power loss. The measured efficiency from the prototype verifies the theoretical calculation, and the qZS-CMI-based grid-tie PV power system is tested in practical.

Original languageEnglish
Article number6736062
Pages (from-to)6108-6117
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Volume61
Issue number11
DOIs
Publication statusPublished - 2014

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Electric potential
Power generation

Keywords

  • Circuit modeling
  • multilevel inverter
  • photovoltaic (PV) power generation
  • quasi-Z source (qZS) inverter

ASJC Scopus subject areas

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

Cite this

Modeling, impedance design, and efficiency analysis of quasi-Z source module in cascaded multilevel photovoltaic power system. / Sun, Dongsen; Ge, Baoming; Yan, Xingyu; Bi, Daqiang; Zhang, Hao; Liu, Yushan; Abu-Rub, Haitham; Ben-Brahim, Lazhar; Peng, Fang Zheng.

In: IEEE Transactions on Industrial Electronics, Vol. 61, No. 11, 6736062, 2014, p. 6108-6117.

Research output: Contribution to journalArticle

Sun, Dongsen ; Ge, Baoming ; Yan, Xingyu ; Bi, Daqiang ; Zhang, Hao ; Liu, Yushan ; Abu-Rub, Haitham ; Ben-Brahim, Lazhar ; Peng, Fang Zheng. / Modeling, impedance design, and efficiency analysis of quasi-Z source module in cascaded multilevel photovoltaic power system. In: IEEE Transactions on Industrial Electronics. 2014 ; Vol. 61, No. 11. pp. 6108-6117.
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