An adaptive Distance Protection for Distribution Network With Inverter-Interfaced Distributed Generation

Inverter-Interfaced Distributed Generation (IIDG) accessed to the high-voltage distribution network may cause protective device tripping missing when using regular distance protection. In case of non-metallic faults, the generation of additional impedance may lead to faulty action of the distance protection, which threatens the safety and stability of the distribution network. Therefore, an adaptive distance protection plan is suggested, which corrects the measured impedance according to the diagram, thus the corrected measured impedance can track the fault impedance. The suggested plan is insensitive to the fault resistance, fault locations and IIDG’s output. The simulation results indicate that the suggested plan can reflect the fault impedance correctly, and accurately identify internal and external faults.