Nonlinear and Transient Stability Analysis of Phase-Locked Loops in Grid-Connected Converters

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jiantao Zhao
  • Meng Huang
  • Han Yan
  • Chi K. Tse
  • Xiaoming Zha

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number9110781
Pages (from-to)1018-1029
Journal / PublicationIEEE Transactions on Power Electronics
Volume36
Issue number1
Online published8 Jun 2020
Publication statusPublished - Jan 2021

Abstract

The undesired nonlinear operation of phase-locked loops (PLL) is one of the main causes of transient instability in grid-connected converters. However, the stable operating region of PLL, knowing which is helpful for protection purposes, is hard to find due to the nonlinear characteristic of the transient process. In this article, the nonlinear characteristic of the PLL control loop relevant to the grid-connected converter operation is identified. The averaging method is applied to derive a time-domain expression for the PLL operation under disturbance. Based on the analytical expression, the transient response and related stability criterion are established, and the PLL design is improved while targeted to focus on various ac grid faults or disturbances. The results, applicable to transient stability enhancement, are verified by circuit simulations and experiments.

Research Area(s)

  • Grid-connected converter, nonlinear analysis, phase-locked loop (PLL), transient stability

Citation Format(s)

Nonlinear and Transient Stability Analysis of Phase-Locked Loops in Grid-Connected Converters. / Zhao, Jiantao; Huang, Meng; Yan, Han et al.
In: IEEE Transactions on Power Electronics, Vol. 36, No. 1, 9110781, 01.2021, p. 1018-1029.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review