Virtual Synchronous Generator-Based Control of Voltage Source Converters for Weak AC Grids

Javad Khazaei, Arash Asrari, Poria Fajri, Peter Idowu

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

Abstract

Vector current control is the most commonly used approach for converters in renewable energy generation systems. Unfortunately, the conventional vector current control for the VSCs is unable to synchronize to the weak ac grid. This paper derives the impedance model of a vector controlled voltage source converter (VSC) enhanced with a virtual synchronous generator (VSG) loop for weak ac grid connections. The impedance modeling includes the dynamic models of the phase-locked loop (PLL), ac side filter, inner current loops, outer power loops, and the VSG loop. Eigen loci of the impedance is used to analyze the stability of the control under different grid strengths. In addition, sensitivity of PLL gains, virtual inertia gains, and dc-link capacitor value on overall system stability is evaluated using frequency-domain analysis.

Original languageEnglish (US)
Title of host publication2019 IEEE Power and Energy Society General Meeting, PESGM 2019
PublisherIEEE Computer Society
ISBN (Electronic)9781728119816
DOIs
StatePublished - Aug 2019
Event2019 IEEE Power and Energy Society General Meeting, PESGM 2019 - Atlanta, United States
Duration: Aug 4 2019Aug 8 2019

Publication series

NameIEEE Power and Energy Society General Meeting
Volume2019-August
ISSN (Print)1944-9925
ISSN (Electronic)1944-9933

Conference

Conference2019 IEEE Power and Energy Society General Meeting, PESGM 2019
CountryUnited States
CityAtlanta
Period8/4/198/8/19

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

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