Open AccessCirculating current derivation and comprehensive compensation of cascaded STATCOM under asymmetrical voltage conditions
Author(s) -
Zhixing He,
Fujun Ma,
An Luo,
Qianming Xu,
Yandong Chen,
Huagen Xiao,
Guobin Jin
Publication year - 2016
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2015.1374
Subject(s) - phasor , compensation (psychology) , control theory (sociology) , voltage , current (fluid) , ac power , symmetrical components , computer science , engineering , electric power system , power (physics) , control (management) , physics , electrical engineering , quantum mechanics , transformer , psychology , artificial intelligence , psychoanalysis
Cascaded static synchronous compensator (STATCOM) with delta‐connected configuration is an effective solution to compensate reactive and negative‐sequence currents. This study focuses on the circulating current and compensation method of delta‐connected STATCOM under asymmetrical voltage conditions. According to the phasor analysis, constrains of voltage phasors and current phasors under reactive current compensation mode, negative‐sequence current compensation mode and comprehensive compensation mode are deduced. On the basis of this, the analytical expressions of circulating current under the three modes are derived. Furthermore, a comprehensive compensation method for delta‐connected STATCOM is proposed. In the proposed method, phase current references are calculated directly with the instantaneous voltage and current signals, which could enhance the dynamic behaviour and cluster‐balancing control performance especially under asymmetrical voltage conditions. Finally, simulation and experiment results have been given to verify the effectiveness and feasibility of the proposed control method.