Front-end isolated quasi-Z-source DC-DC converter modules in series for photovoltaic high-voltage DC applications

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

A quasi-Z-source modular cascaded converter (qZS-MCC) is proposed for high-voltage (HV) dc integration of photovoltaic (PV) power. The qZS-MCC comprises front-end isolated qZS half-bridge (HB) dc-dc converter submodules (SMs) in series. By the qZS-HB handling PV voltage and power variations, a unified duty cycle is applicable for the front-end isolation converter of all SMs. Resultantly, the proposed system improves the quasi-Z-source cascaded multilevel inverter and the modular multilevel converter based PV counterparts in terms of no double-line-frequency pulsating power so as to low qZS impedance, HV dc collection of PV power thus to reduce conversion stages for dc transmission, and overcoming the limit of series-output voltage with simple galvanic isolation. Operating principle and power loss evaluation of the qZS-MCC are presented. Parameter design guidelines and simulation are addressed based on a 60-kW SM; experimental results are carried out on a downscaled prototype as a proof-of-concept, demonstrating the validity of the proposed system.

Original languageEnglish
Title of host publication2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1214-1219
Number of pages6
Volume2016-May
ISBN (Electronic)9781467383936
DOIs
Publication statusPublished - 10 May 2016
Event31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016 - Long Beach, United States
Duration: 20 Mar 201624 Mar 2016

Other

Other31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
CountryUnited States
CityLong Beach
Period20/3/1624/3/16

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Keywords

  • dc-dc power conversion
  • galvanic isolation
  • Photovoltaic power system
  • quasi-Z-source converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Liu, Y., Abu-Rub, H., & Ge, B. (2016). Front-end isolated quasi-Z-source DC-DC converter modules in series for photovoltaic high-voltage DC applications. In 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016 (Vol. 2016-May, pp. 1214-1219). [7468023] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2016.7468023