Power Controllability of a Three-Phase Converter With an Unbalanced AC Source
Abstract— Power < Final Year Projects 2016 > Controllability of a Three-Phase Converter With an Unbalanced AC Source. Three-phase dc–ac power converters suffer from power oscillation and overcurrent problems in case of the unbal-anced ac source voltage that can be caused by grid/generator faults. Existing solutions to handle these problems are properly selecting and controlling the positive- and negative-sequence currents. In this paper, a new series of control strategies which utilize the zero-sequence components are proposed to enhance the power control ability under this adverse condition.It is concluded that by introducing proper zero-sequence current controls and corresponding circuit conﬁgurations, the power converter can enable more ﬂexible control targets, achieving better performances in the delivered power and the load current when suffering from the unbalanced ac voltage.
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