AUTHOR=Jiang Kezheng , Ye Chang , Zheng Wanning , Chen Yang , Xiong Ping , Li Lie , Hu Pan 

TITLE=Relative stability evaluation of HVDC-connected wind farms

JOURNAL=Frontiers in Energy Research

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2024.1379009

DOI=10.3389/fenrg.2024.1379009

ISSN=2296-598X

ABSTRACT=<p>The small-signal stability of high voltage direct current (HVDC)-connected wind farms (WFs) is a challenging issue in modern power systems. The relative stability, i.e., the stability margin, of such a typical multiple-input multiple-output (MIMO) system is quite difficult to be quantified. This paper evaluates the relative stability of HVDC-connected WFs using a new stability index based on the <italic>ν</italic>-gap metric. We first develop a MIMO model represented by a transfer function matrix of the HVDC-connected WFs. Then, a new stability index, i.e., the robust stability margin, based on the <italic>ν</italic>-gap metric is proposed to quantify the relative stability of such a MIMO system. Finally, we propose a method to compute the stable region of control parameters based on the corresponding stability criterion of <italic>ν</italic>-gap metric. Case studies are given to demonstrate the effectiveness of the proposed method.</p>