Dominant instability mechanism of VSI connecting to a very weak grid

Li, Chuanyue ORCID: https://orcid.org/0000-0001-6835-6642, Wang, Sheng ORCID: https://orcid.org/0000-0002-2258-2633, Colas, Frederic and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 2022. Dominant instability mechanism of VSI connecting to a very weak grid. IEEE Transactions on Power Systems 37 (1) , pp. 828-831. 10.1109/TPWRS.2021.3115968

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Abstract

In this paper, it is identified that unstable weak grid connection of voltage source inverters (VSIs) is dominantly caused by the current control. In particular, it is found the proportional gain k p of conventional PI controller cannot balance the grid voltage impact and damping capability when a weak grid with short circuit ratio (SCR) < 1.3 is connected. This issue is solved in this paper by simply restructuring the PI controller as an IP controller for current control. This IP controller will not change the tuning method of current control and make this VSI indeed connect to a very weak grid with rated power injection.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	0885-8950
Date of First Compliant Deposit:	2 November 2021
Date of Acceptance:	15 October 2021
Last Modified:	22 Nov 2024 09:00
URI:	https://orca.cardiff.ac.uk/id/eprint/144988

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