IEEE Open Journal of Power Electronics (Jan 2022)

Stability Assessment of A Radial Grid With Power Converters

  • Xingqi Liu,
  • Zhixiang Zou,
  • Jiajun Yang,
  • Jian Tang,
  • Zhiren Liu,
  • Giampaolo Buticchi,
  • Zheng Wang,
  • Ming Cheng

DOI
https://doi.org/10.1109/OJPEL.2021.3138509
Journal volume & issue
Vol. 3
pp. 61 – 74

Abstract

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The increase proportion of power converters causes stability problems in the radial grid. To address these issues, this paper firstly proposes a unified modeling procedure and applies it to two types of converters. Secondly, the impedance models are used to analyze the stability of a radial grid with converters under four cases. The influence of the short circuit ratio (SCR) and line impedance on system stability are investigated. Then, a comprehensive sensitivity analysis is performed in order to investigate the effects of parameters variations on the closed-loop poles of the system under different conditions. Finally, the accuracy of the model and theoretical analysis are verified by simulations and Hardware-in-the-Loop (HiL) tests.

Keywords