Distance protection and fault location of the PV power plants distribution lines

The Journal of Engineering

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[1] Electrical and Electronic Eng. Department, Faculty of Engineering, University of Khartoum, Khartoum, Sudan;School of Electrical and Electronic Engineering, North China Electric Power University, Beijing, People's Republic of China;School of Electrical and Electronic Engineering, North China Electric Power University, Beijing, People's Republic of China;School of Electrical and Electronic Engineering, North China Electric Power University, Beijing, People's Republic of China;State Key Lab of Alternate EPS with RE Sources, North China Electric Power University, Beijing, People's Republic of China;

关键词: fault location;    power grids;    power engineering computing;    power transmission protection;    power transmission faults;    invertors;    synchronous generators;    photovoltaic power systems;    power distribution faults;    power generation faults;    PV power plants distribution lines;    photovoltaic sources;    grid-connected inverters;    power systems;    distribution feeders;    study analyses;    grid-connected PV system;    conventional distance protection;    over-current protection;    fault ride-through;    fault condition;    double-end-impedance-based fault location;    PVPP power lines;    inverter control loops;    accurate fault location;   

DOI  :  10.1049/joe.2018.8795

来源: publisher

【 摘 要 】

Unlike the synchronous generators, the short-circuit current provided by the photovoltaic (PV) sources is limited by the grid-connected inverters and closely related to the normal conditions, which impacts the protection of the power systems. This study deals with the protection of the power lines (distribution feeders) that connect the PV power plants (PVPP) to the grid; the first part of this study analyses the impact of the grid-connected PV (GCPV) system on the conventional distance protection. A specific coordination between the over-current protection of the grid side and the distance protection of the PVPP side was used to eliminate this impact. This coordination requires delaying the distance protection and keeping the inverter connected to the grid, which was achieved by fault ride-through (FRT) feature accompanied with the inverter control during the fault condition. The second part studies the possibility of using the double-end-impedance-based fault location on the PVPP power lines, and some FRT strategies were suggested to reduce the effect of the inverter control loops on obtaining the accurate fault location. The proposed work was verified by GCPV system model using MATLAB/Simulink software.

【 授权许可】

CC BY