Open AccessResearch on DC‐link voltage stabiliser for voltage source converter as connected to weak grid
Author(s) -
Huang Yunhui,
Tang Jinrui,
Zhu Guorong,
Li Xianqiang,
Tang Haiyan,
Li Yan
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0714
Subject(s) - stabiliser , control theory (sociology) , voltage , grid , voltage source , computer science , control (management) , engineering , materials science , electrical engineering , mathematics , geometry , nanotechnology , artificial intelligence
This study investigates design and analysis of direct current (DC)‐link voltage stabiliser for voltage source converter (VSC) as connected to weak grid. To begin with, stability mechanism of VSC is investigated with integrated to weak grid. It is found that phase‐locked loop and terminal voltage control perform as a lagging regulation for DC‐link voltage control, decreasing stability of system. According the mechanism, DC‐link voltage stabiliser needs to provide a leading regulation to eliminate the negative effects. Then, scheme, design and effect of DC‐link voltage stabiliser are studied. Design schemes of stabiliser's inner control loops are presented by bode plots and control blocks. Moreover, control parameters of stabiliser are designed with some practical scenario. Furthermore, effects of stabiliser on VSC control system stability are investigated with varied grid strengths and operating points. Analysis results show that DC‐link voltage stabiliser strengthens system damping and improve stability limits. Time‐domain simulation results show DC‐link voltage stability is improved with stabiliser integrated to VSC, verifying effectiveness of design schemes.