With the penetration of photovoltaic(PV)station in the steady improvement and the low voltage ride-through(LVRT)of the PV station

lots of failure analysis is no longer suitable for use. For this reason

an analysis is made of the failure output characteristics of the PV station prior to development of the current source equivalent model controlled by the positive sequence voltage of the point of common coupling. Secondly

the node voltage equations under different fault conditions are analyzed and the test root method is proposed under the double-ended search method by the nonlinear relationship between the output current of PV station and positive sequence voltage by different types of faults. Lastly

the accuracy of the algorithm is verified by comparing the results with the simulation results while the failure characteristics are compared between LVRT and traditional control strategies to verify the supporting role in LVRT control.