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Most of the existing unbalanced control strategies only focus on a single control objective, which makes it difficult for three-phase grid-connected inverters to operate at an optimal performance according to the demand. This paper has analyzed the amplitude and phase relations between the positive- and negative-sequence output current under different control objectives, and then proposes a simplified...
A virtual admittance control strategy is proposed for three-phase voltage source PWM rectifier by analysis on the time-domain relationship between three-phase AC current and three-phase AC voltage under unbalanced input voltage conditions. The strategy does not only simplify the control algorithm, but also realize wanted power factor by the Coordinate Transformation. With reduced computation and improved...
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