A universal controller for grid-connected voltage-source converters

Lennart Harnefors*, Jarno Kukkola, Mikko Routimo, Marko Hinkkanen, Xiongfei Wang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Power-synchronization control (PSC) and vector current control (VCC), the latter including cascaded outer loops, are, respectively, considered to be grid-forming and grid-following schemes. They have significant structural differences. Despite that, it is here shown that the two schemes can be unified by making a series of minor modifications to PSC. This results in a universal controller, allowing various combinations of the two schemes to be explored. Fundamentally, it allows PSC to be used as guideline for a robust VCC design, permitting stable and well-performing operation irrespective of the grid strength.
Original languageEnglish
Number of pages10
JournalIEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
DOIs
Publication statusE-pub ahead of print - 19 Nov 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Grid-connected converters
  • Grid-following control
  • Grid-forming control
  • Robustness
  • Voltage-source converters

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