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Heretofore, the comprehensive fault analysis approach for AC/DC hybrid grids has not been sufficiently investigated. Inspired by the conventional symmetrical components method, a novel “sequence component network” model based on the mapping relation is proposed to study the characteristics of AC (DC) side after DC-side (AC-side) faults in AC/DC hybrid grids. Subsequently, the AC-side electrical characteristic after DC-side faults was discussed employing the “sequence component network” model. Finally, taking into account the influence of different grounding modes, a DC-type integration system model of PV stations was established in PSCAD/EMTDC to verify the proposed approach.
Inspec keywords: distributed power generation; power system faults; photovoltaic power systems; power grids; fault diagnosis; AC-DC power convertors; power distribution faults
Subjects: Reliability; Control of electric power systems; Distribution networks; AC-DC power convertors (rectifiers); Distributed power generation; Solar power stations and photovoltaic power systems