A universal controller for grid-connected voltage-source converters

Lennart Harnefors; Jarno Kukkola; Mikko Routimo; Marko Hinkkanen; Xiongfei Wang

doi:10.1109/JESTPE.2020.3039407

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 journal › Article › Scientific › peer-review

102 Citations (Scopus)

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Abstract

The 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 a guideline for a robust VCC design, permitting stable and well-performing operation irrespective of the grid strength.

Original language	English
Pages (from-to)	5761-5770
Number of pages	10
Journal	IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume	9
Issue number	5
Early online date	19 Nov 2020
DOIs	https://doi.org/10.1109/JESTPE.2020.3039407
Publication status	Published - Oct 2021
MoE publication type	A1 Journal article-refereed

Keywords

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

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10.1109/JESTPE.2020.3039407

ELEC_Harnefors_etal_A-Universal-Controller_JESTPE_2020_acceptedauthormanuscriptAccepted author manuscript, 3.22 MB

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AB - The 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 a guideline for a robust VCC design, permitting stable and well-performing operation irrespective of the grid strength.

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A universal controller for grid-connected voltage-source converters

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