不平衡电网下变流器多机系统的稳定性分析

Translated title of the contribution: Stability analysis of multi-VSC system under unbalanced power grid

Yi Zhang, Zhixiang Zou, Jiajun Yang, Wu Chen, Zheng Wang, G. Buticchi, Ming Cheng

Research output: Journal PublicationArticlepeer-review

Abstract

The stability problem of voltage source converter(VSC) is studied based on the grid-connected interactive system under unbalanced grid conditions. A converter admittance model with double second-order generalized integrator phase locked loop(DSOGI-PLL) is proposed under three-phase unbalanced power grid conditions. The admittance characteristics of VSC systems with different types of phase locked loop(PLL)are analyzed and summarized. Based on the admittance model,the stability of multi-VSC systems with different types of PLL is studied,and the improvement direction for the stability of multi-VSC system is pointed out. Further,it is proposed that the integration of DSOGI-PLL converters can effectively improve the stability margin of converters while increasing the output power of the grid-connected system. At the same time,the interaction mechanism between VSC and grid impedance is studied when the negative sequence voltage changes at point of common coupling. The theoretical analysis is verified by experimental results.

Translated title of the contributionStability analysis of multi-VSC system under unbalanced power grid
Original languageChinese (Traditional)
Pages (from-to)176-183
Number of pages8
JournalDianli Zidonghua Shebei / Electric Power Automation Equipment
Volume43
Issue number10
DOIs
Publication statusPublished - 2023

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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