Open AccessDerivation of zero‐sequence circulating current and the compensation of delta‐connected static var generators for unbalanced load
Author(s) -
Fujun Ma,
An Luo,
Qiaopo Xiong,
Zhixing He,
Qianming Xu
Publication year - 2016
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0682
Subject(s) - symmetrical components , control theory (sociology) , sequence (biology) , phasor , compensation (psychology) , current (fluid) , scalable vector graphics , three phase , power (physics) , harmonic , ac power , zero (linguistics) , voltage , computer science , engineering , electric power system , physics , electrical engineering , control (management) , acoustics , philosophy , artificial intelligence , psychoanalysis , transformer , linguistics , biology , genetics , operating system , psychology , quantum mechanics
Cascaded static var generators (SVG) with delta‐configuration is discussed for a compensation of reactive, negative‐sequence and harmonic currents. According to phasor analysis of negative‐sequence current compensation, the role of zero‐sequence circulating current for power balance is analysed. According to power analysis, the analytical expressions of zero‐sequence circulating current and 2nd frequency ripples of dc‐link voltages are derived. On the basis of this, the phase‐current reference detection and the simplified control method of SVG for negative‐sequence current compensation are proposed, which is concise and can achieve power balance of three‐phase clusters by superimposing a zero‐sequence circulating current without additional controllers. Finally, the simulation and experimental results have effectively verified the proposed method.