Open AccessImproved droop control strategy for stability enhancement of VSC–MTDC systems with DC reactors
Author(s) -
Zhang Ming,
Xu Yin,
Wang Zhenji,
Wu Xiaoyu,
He Jinghan
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0839
Subject(s) - voltage droop , control theory (sociology) , voltage source , computer science , direct current , stability (learning theory) , transient (computer programming) , signal (programming language) , voltage , control (management) , engineering , electrical engineering , operating system , artificial intelligence , machine learning , programming language
DC reactors installed in voltage source converter based multi‐terminal direct current (VSC–MTDC) systems will benefit the protection while degrading system stability. This study firstly analyses the protection method for VSC–MTDC systems with DC reactors. Then the small‐signal model of VSC–MTDC systems is built for stability analysis. An improved droop control strategy using the linear combination of the voltages at the two terminals of DC reactors as inputs is proposed to enhance the stability of VSC–MTDC systems. Small‐signal analysis and transient simulations are performed on a four‐terminal VSC–MTDC network to validate the effectiveness of the proposed protection and control strategy.