Research on Grounding Fault Line Selection Method Considering Distributed Photovoltaic Access
Distributed photovoltaic develops rapidly because of its clean and efficient characteristics,but the distributed photo-voltaic may increase the complexity of distribution network grounding fault characteristics.In view of the difficult problem of distribution network grounding fault line selection after distributed photovoltaic access,based on the analysis of the influence of distributed photovoltaic access on distribution network grounding fault characteristics,a multi-component fusion grounding fault line selection method based on S transform transient characteristic quantity,current increment fifth harmonic component steady-state characteristic quantity and inverter injection signal is proposed.A grounding fault simulation model of distribution network with distributed photovoltaic access is established,and through the comparison and analysis of line selection of distrib-uted photovoltaic with different grid-connected capacity,three-phase asymmetry and fault transition resistance,the effective-ness and superiority of the proposed method are verified.
distribution networkgrounding fault line selectiondistributed photovoltaicStransform