A Low-Harmonic Control Method of Bidirectional Three-Phase Z-Source Converters for Vehicle-to-Grid Applications

Wenzheng Xu, Ka Wing Chan, Siu Wing Or, Siu Lau Ho, Ming Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


Three-phase Z -source inverters provide a solution of voltage boosting by a single-stage topology. They are also capable of bidirectional operation as rectifiers, thus have great potential for applications in the field of transportation electrification such as vehicle-to-grid (V2G) chargers. In this article, three new modulation schemes for three-phase Z -source converters are proposed and investigated. The best performed one is further developed to a closed-loop proportional-integral (PI) control method. Although the voltage conversion ratio is flexible, the output voltage total harmonics distortion (THD) is below 3% within the voltage ratio range 0.5-2.5. The effectiveness of the proposed method has been fully validated in MATLAB/Simulink simulations and RT-Lab hardware-in-loop (HIL) experiments based on the real-time simulator OPAL-RT OP4510. Compared to existing control methods, the proposed one performs better with reduced harmonics, flexible voltage gain, and simpler control algorithm.

Original languageEnglish
Article number9050804
Pages (from-to)464-477
Number of pages14
JournalIEEE Transactions on Transportation Electrification
Issue number2
Publication statusPublished - Jun 2020


  • Bidirectional converter
  • closed-loop control
  • shoot-through states
  • voltage harmonics
  • Z-source converter

ASJC Scopus subject areas

  • Automotive Engineering
  • Transportation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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