Open AccessOnline dynamic voltage stability assessment method of AC/DC power systems
Author(s) -
Wang Yongbo,
Li Kuan,
Zhang Guohui,
Su Jianjun,
Xie Jiping,
Li Jialu
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8780
Subject(s) - electric power system , ac power , computer science , voltage , direct current , power (physics) , control theory (sociology) , voltage source , electronic engineering , engineering , electrical engineering , physics , control (management) , quantum mechanics , artificial intelligence
The reactive power absorption of conventional line commutated converter–high‐voltage direct current transmission systems challenges on the voltage stability of AC/DC power systems. Many online dynamic voltage stability assessment approaches have been put forward to AC power systems, but the impact of DC transmissions is seldom taken into account for AC/DC power systems. In this study, an online dynamic voltage stability assessment method of AC/DC power systems is proposed. The proposed method models the converter as an equivalent AC voltage source in series with the internal impedance by utilising the control mode model of DC transmission systems and the measured data of the converter bus. The equivalent AC voltage source can identify the dynamic of DC transmissions. Then the AC/DC power system can be modelled by the equivalent AC power system. Based on the nodal equivalent method, the proposed method establishes a voltage stability index of the equivalent AC power systems for the dynamic voltage stability assessment of AC/DC power systems. The simulation demonstrated the effectiveness of the proposed method.