Improved MIMO modelling and enhanced transient performance of phase locked loop during grid fault

Vatta Kkuni, Kanakesh and Yang, Guangya and Hong, Qiteng and Booth, Campbell (2021) Improved MIMO modelling and enhanced transient performance of phase locked loop during grid fault. IEEE Transactions on Industrial Electronics. ISSN 0278-0046 (https://doi.org/10.1109/TIE.2021.3073307)

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Abstract

In a grid-connected power converter, synchronizing with ac grid voltage is often realized by a phase-locked loop (PLL). A single input single output linear model of PLL with the phase angle of the point of common coupling (PCC) voltage as input and the estimated phase angle as the output is generally used in the PLL analysis and design. However, an undesirable coupling between the magnitude and phase of the input voltage is present when a filtering stage is incorporated before the control loop, which cannot be captured by a SISO model, and could result in a large disturbance in the PLL estimated phase during grid faults}. To overcome this deficiency in SISO PLL modeling, this paper proposes a generalized multi-input multi-output linear model that captures the complete PLL dynamics during symmetrical faults for a PLL equipped with any prefilter. The proposed model captures this undesirable coupling between the magnitude and phase of the input voltage. Furthermore, a compensation method that decouples the magnitude dynamics of the input voltage from the phase dynamics is proposed in this paper. The proposed compensation improves the PLL's phase tracking performance by ensuring that the prefiltered PLL acts only on the PCC voltage phase changes.

ORCID iDs

Hong, Qiteng ORCID: https://orcid.org/0000-0001-9122-1981

Booth, Campbell ORCID: https://orcid.org/0000-0003-3869-4477

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  Item type:	Article
  ID code:	75999
  Dates:	Date Event 20 April 2021 Published 20 April 2021 Published Online 26 March 2021 Accepted
  Notes:	© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
  Subjects:	Technology > Electrical engineering. Electronics Nuclear engineering
  Department:	Faculty of Engineering > Electronic and Electrical Engineering
  Depositing user:	Pure Administrator
  Date deposited:	01 Apr 2021 13:43
  Last modified:	16 Nov 2024 01:19
  URI:	https://strathprints.strath.ac.uk/id/eprint/75999