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http://dx.doi.org/10.6113/TKPE.2014.19.4.332

Control of DC-side Voltage Unbalance among Phases in Multi-level H-Bridge STATCOM with Unbalanced Load  

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)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.19, no.4, 2014 , pp. 332-341 More about this Journal
Abstract
A cascaded H-bridge multi-level STATCOM(STATic synchronous COMpensator), which is composed of many cell inverters with independent dc-sources, generates inevitably dc-side voltage unbalance among phases when it compensates unbalanced load. It comes from the difference of flowing active power in each phase when this compensator makes negative-sequence current to eliminate the unbalance of source-side current. However, this unbalance can be controlled by injecting zero-sequence current which is decoupled with grid currents, so the compensator can work well during this balancing process. Both a feedback control algorithm, which produces zero-sequence current proportional to dc-side voltage unbalance within each phase, and a feedforward control algorithm, which makes zero-sequence current directly from the compensator's negative-sequence current, were proposed. The dc-side voltage of each phase can be controlled stably by these proposed algorithms in both steady-state and transient, so the compensator can have fast response to satisfy control performance under rapid changing load. These balancing controllers were implemented and verified via simulation and experiment.
Keywords
STATCOM; dc-side voltage unbalance; unbalanced load; negative-sequence current; zero-sequence current;
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