For cascaded system, interactions among individually designed power subsystems may cause the instability of the whole system. It has been shown recently that the series-virtual-impedance (SVI) control strategy can sta...
详细信息
ISBN:
(纸本)9781509007370
For cascaded system, interactions among individually designed power subsystems may cause the instability of the whole system. It has been shown recently that the series-virtual-impedance (SVI) control strategy can stabilize the cascaded system via shaping the load input impedance in a very small frequency to minimize its impact on the original load converter. In this paper, a further investigation of the SVI control strategy is carried out by two-port network analysis. Firstly, it is pointed out that, though the impact of the SVI control strategy is limited in a very small frequency, it still deteriorates the performance of the original load converter. In order to overcome this drawback, this paper proposes source-side series-virtual-impedance (SSVI) control strategy, which move the series-virtual-impedance of the traditional SVI control strategy from load side to sourceside by changing the control of the source converter instead of the load converter. With the proposed SSVI control strategy, the cascaded system not only can solve its instability problem, but also can improve the performance of its source converter. Finally, a 100W 48V-32V-24V experimental system is fabricated to validate the SSVI control strategy.(1)
For cascaded system, interactions among individually designed power subsystems may cause the instability of the whole system. It has been shown recently that the series-virtual-impedance (SVI) control strategy can sta...
详细信息
ISBN:
(纸本)9781509007387
For cascaded system, interactions among individually designed power subsystems may cause the instability of the whole system. It has been shown recently that the series-virtual-impedance (SVI) control strategy can stabilize the cascaded system via shaping the load input impedance in a very small frequency to minimize its impact on the original load converter. In this paper, a further investigation of the SVI control strategy is carried out by two-port network analysis. Firstly, it is pointed out that, though the impact of the SVI control strategy is limited in a very small frequency, it still deteriorates the performance of the original load converter. In order to overcome this drawback, this paper proposes source-side series-virtual-impedance (SSVI) control strategy, which move the series-virtual-impedance of the traditional SVI control strategy from load side to sourceside by changing the control of the source converter instead of the load converter. With the proposed SSVI control strategy, the cascaded system not only can solve its instability problem, but also can improve the performance of its source converter. Finally, a 100W 48V-32V-24V experimental system is fabricated to validate the SSVI control strategy.
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