Analysis on protection configuration of AC/DC distribution networks

Abstract

In view of the changes in the form of low-voltage distribution networks caused by the access of large-scale distributed generation （DG） and DC loads in the new power system， the protection and control of the distribution network under the new situation is studied. Firstly， this paper establishes a typical topology structure of a new distribution network with distributed generation and DC loads， and studies the transient characteristics on AC side and DC side， as well as the transient impedance characteristics during faults. Secondly， a new protection and configuration method and protection setting principle for low-voltage distribution networks under a new pattern is constructed based on transient characteristics. Finally， a new distribution network model is built using the MATLAB simulation platform to simulate the faults at typical locations of AC/DC distribution networks. It is verified that the proposed protection and control method has the advantages of accurate judgment and easy implementation.

Keywords

• new power system
• ac/dc distribution networks
• protection method
• protection criterion