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http://dx.doi.org/10.6113/TKPE.2015.20.1.19

Current Control in Cascaded H-bridge STATCOM for Electric Arc Furnaces  

Kwon, Byung-Ki (POSCO ICT R&D Center)
Jung, Seung-Ki (Dept. of Electrical Eng., Kwangwoon University)
Kim, Tae-Hyeong (POSCO ICT R&D Center)
Kim, Yun-Hyun (POSCO ICT R&D Center)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.20, no.1, 2015 , pp. 19-30 More about this Journal
Abstract
A static synchronous compensator (STATCOM) applied to rapidly changing, highly unbalanced loads such as electric arc furnaces (EAFs), requires both positive-sequence and negative-sequence current control, which indicates fast response characteristics and can be controlled independently. Furthermore, a delta-connected STATCOM with cascaded H-bridge configuration accompanying multiple separate DC-sides, should have high performance zero-sequence current control to suppress a phase-to-phase imbalance in DC-side voltages when compensating for unbalanced load. In this paper, actual EAF data is analyzed to reflect on the design of current controllers and a pioneering zero-sequence current controller with a superb transient performance is devised, which generates an imaginary -axis component from the presumed response of forwarded reference. Via simulation and experiments, the performance of the positive, negative, and zero-sequence current control of a cascaded H-bridge STATCOM for EAF is verified.
Keywords
STATCOM; Electric arc furnace; Unbalanced load; Voltage imbalance; Positive-sequence current control; Negative-sequence current control; Zero-sequence current control;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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