Analysis and summary of the influence of distributed power supply access on relay protection of distribution network

After the distributed power supply is connected to the distribution network, it has a great impact on the original relay protection and brings a new challenge to the existing protection configuration scheme. This paper introduces three current protection schemes and inverse time overcurrent protection schemes which are widely used in distribution network at present. This paper summarizes some main relay protection measures including distributed generation at home and abroad as well as their advantages and disadvantages, and finally gives the improvement strategy including distributed generation. (paper)