Journal
IET GENERATION TRANSMISSION & DISTRIBUTION
Volume 10, Issue 12, Pages 2924-2932Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-gtd.2015.1374
Keywords
static VAr compensators; asymmetrical voltage conditions; circulating current derivation and comprehensive compensation method; delta-connected STATCOM configuration; cascaded STATCOM configuration; reactive current compensation; negative-sequence current compensation; phasor analysis; voltage phasor; current phasor; cluster-balancing control performance; dynamic behaviour enhancement; static synchronous compensator
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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.
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