Abstract: Carrying out rapid fault selection of PV power station collection lines is of great significance to ensure the stable operation of the system. A fault method for PV power station collection lines based on the zero-sequence current gradient Teager energy operator (TEO) is proposed. The zero-sequence current sequence model of the collection line for single-phase ground fault is established, and the distribution law of the zero-sequence current and voltage as well as the output characteristics of PV power supply during the fault period are analyzed. The TEO is used to calculate the energy value of the zero-sequence current gradient, and the threshold is based on the difference in energy values between the fault line and the non-fault line measurement points. A fault selection criterion is proposed, and a PV power station line model is built. Simulation verification shows that the proposed method has good selection effect under different fault positions, grounding resistances, unit outputs, and noise interference scenarios.