Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zhiwei BIAN
  • Yuqi PENG
  • Yuanbin HE
  • Lijun HUANG
  • Xiaogao XIE

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)118334-118345
Journal / PublicationIEEE Access
Volume9
Online published20 Aug 2021
Publication statusPublished - 2021

Link(s)

Abstract

To improve both the stability and the disturbance suppression ability of single-phase grid-connected inverters through LCL filters, this paper proposes an inverter output impedance enhancing control mechanism. The impedance enhancing control mechanism employs a virtual impedance control and a node-voltage feedforward control to ensure sufficient passivity and high amplitude of inverter output impedance over wide frequency range of interest. The proposed control mechanism is realized through combination control of a low-voltage bidirectional voltage-source-converter (B-VSC) connected at the filter capacitor branch and the main inverter. The B-VSC sustains an extra low power without sacrificing the efficiency of the inverter. Both the simulation and experimental results are finally given to verify the validity of the proposed method, which shows the performance improvement of the proposed radial-line inverter system working under variable grid conditions.

Research Area(s)

  • Harmonic analysis, Impedance, impedance enhancement, Inverters, passivity, Power harmonic filters, Power system stability, stability, Stability criteria, Voltage control

Citation Format(s)

Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection. / BIAN, Zhiwei; PENG, Yuqi; HE, Yuanbin; HUANG, Lijun; XIE, Xiaogao; CHUNG, Henry Shu-hung.

In: IEEE Access, Vol. 9, 2021, p. 118334-118345.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review