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DC Pole-to-Pole Short-Circuit Behavior Analysis of Modular Multilevel Converter
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This paper presents the behavior analysis of modular multilevel converter under DC pole-to-pole short-circuit fault,which is an important issue in fault management,electrical system design and MMC based power system protection and control.Firstly,the transient behavior is analyzed and the conduction overlapping angle y is defined.Secondly,seven possible short-circuit current paths induced by different y values are identified,and the corresponding engineering short-circuit current calculation methods for both AC and DC sides are proposed.And then,the influences of impedance distribution factor k and equivalent short-circuit resistance Rsc on short-circuit currents are elaborated.Finally,case study is used to verify the effectiveness of the proposed analysis methods.
short-circuit fault managementshort-circuit current practice calculationmodular multilevel converter (MMC)DC pole-to-pole short-circuit fault
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