This paper analyzes the impact of distributed generation (DG) penetration rate

grid connection location

and capacity on existing protection

with a focus on the influence of DG integration at different locations on relay protection under faults in different sections and feeders. Protection schemes are developed for different DG integration locations

and an adaptive protection method based on real-time grid operating states is proposed. Through fault location

fault type identification

real-time calculation of impedance and electric potential

and dynamic correction of setting coefficients

the proposed method enables protection settings to be automatically adjusted according to DG operating states. It can effectively expand the protection range

avoid maloperation and failure to operate

improve protection adaptability

and ensure grid stability. Finally

the analysis conclusions are verified by MATLAB simulation

forming a protection scheme with reference value.