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A reasonable and stable droop based hierarchical coordinated control with primary, secondary, and tertiary control steps is proposed for the operation of a grid-connected mode. Interlinking converter and the grid forming sources are coordinated. The droop based hierarchical control scheme handles active power imbalance in microgrids reasonably while performing exact power sharing. In addition, the...
In a soft-starter for 3-phase induction motor, if a 3-phase voltage supply is unbalanced, the unbalanced voltage condition gives bad influences such as a temperature rise, an increase of loss, acoustic noise and vibration, to the induction motor. In this paper, new unbalanced voltage compensation algorithm which switching angles are adjusted based on a voltage vector analysis will be presented.
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