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Due to the high frequency nature and constant power load characteristics, stability issue exists widely in contemporary power electronic systems. Impedance-based criteria can be used in stability prediction. Thus, the accurate extraction of impedance becomes significantly important. For AC systems, impulse injection method has been proposed for its short measurement duration, but the accuracy needs...
Grid-connected converter systems could be unstable due to the interactions among power converters and/or sources/loads. Impedance-based stability analysis is an effective approach to predict system stability and provide specifications for power converter design. Therefore online grid impedance measurement is significant. This paper proposes a novel online grid impedance measurement method for grid-connected...
Power electronic systems could be unstable due to the interaction between converters. Impedance-based stability analysis is an effective approach to predict stability and to provide design criteria. Therefore significant are impedance measurement techniques, which have been well established for DC systems, but need to be improved for AC systems nevertheless. This paper proposes a novel AC impedance...
Stability prediction for distributed DC power systems is analyzed. When the stability of source converters in paralleled with a constant current load is guaranteed, Middlebrook impedance criterion can be used for the whole system stability prediction. Output impedance of paralleled DC power system is analyzed and stability prediction method for source converters in paralleled is proposed. And then...
In this paper, through deduction and simplification, output impedance of each module and total output impedance of paralleled system with active current sharing control in paralleled operation are derived by measuring the output impedance of each module working standalone with particular connection ways of current sharing bus and calculation. The proposed output impedance derivation method can be...
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