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Energy balancing of the alternate arm converter (AAC) takes place during the overlap period, when a circulating current flows through both arms of the converter. In this paper, the limitations of the commonly used energy balancing methods of the AAC under grid imbalances are demonstrated. It is shown that the overlap control can only provide sufficient energy balancing for a relatively limited voltage...
The increasing wind power penetration brings new challenge for wind turbine to provide Low Voltage Ride-Through (LVRT) capability. Doubly Fed Induction Generator (DFIG) has been widely used in wind turbines; due to its cost-effective partially power rated of the converter and Variable-Speed Constant-Frequency (VSCF) operation. However, the DFIG system has two poorly damped poles and is sensitive to...
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