Fault Location Of The Grid Connected PV (GCPV) System Transmission Lines

PV system integration with power grid has many challenges.One of these,the disconnection of PV inverters from the grid under grid faults;these disconnections may lead to a stability problem in larger scale of PV power plant.This thesis firstly illustrates the two-stage PV inverter configuration and its conventional control method and then presents the implementation of DC braking chopper(BC)and avoided the MPPT operation during the LVRT operation(A-MPPT).Unlike the synchronous generators,the short-circuit current provided by the PV sources is limited by the grid-connected inverters and closely related to the normal conditions,which impacts the protection of the power systems.The second part of this thesis studies the possibility of using the double-end impedance based fault location on the PV farms transmission lines,and a fault ride-through strategy is suggested to reduce the effect of the inverter control loops on obtaining the accurate fault location.All the work was validated and verified by a 100 kW grid-connected PV system model using MATLAB/Simulink software.