LAUSR

Power oscillation is a technical challenge for the grid-connected three-phase current source rectifiers (3ph-CSRs) under unbalanced grid voltage conditions. To manipulate the instantaneous power adapted to different grid requirements under unbalanced grid voltage conditions, a conductance emulating control method is proposed in this brief. The proposed method constructs a fictitious voltage pair with two individually adaptable parameters. One parameter regulates the distribution of oscillating power between active power and reactive power, and another parameter controls the average reactive power. Then, the rectifier imitates variable conductance under the fictitious voltage pair, regulating the average active power. As a result, the power control of the grid-connected 3ph-CSRs becomes flexible and adaptable to various grid requirements. The correctness and effectiveness of the proposed control scheme are verified by experimental results.