Power Generation Technology ›› 2019, Vol. 40 ›› Issue (1): 22-27.DOI: 10.12096/j.2096-4528.pgt.18192

• Energy Internet • Previous Articles     Next Articles

The Impact of DG Access on Microgrid Current Protection

Jing DING1(),Xin WANG1,Shuwen ZHENG2,Yu CHEN3,Shiqi SUN1   

  1. 1 State Grid Hubei Electric Power Co., LTD., Ezhou Power Supply Company, Ezhou 436000, Hubei Province, China
    2 State Grid Henan Electric Power Co., LTD., Pingdingshan Power Supply Company, Pingdingshan 467000, Henan Province, China
    3 Hubei Huadian Xisaishan Power Generation Supply Company, Huangshi 435001, Hubei Province, China
  • Received:2018-11-05 Published:2019-02-28 Online:2019-02-26

Abstract:

When distributed generator (DG) is connected to the microgrid, the microgrid will change from single source system to multiple source system, which will change the power flow distribution and fault short-circuit current flow of the original network, the sensitivity will decrease, and the phenomenon of false rejection will occur. In this paper, the influence of DG on the protection of microgird is analyzed, and the model is built on the PSCAD. The effect of DG on the protection of microgird is verified.

Key words: distributed generator, microgird, current protection