Effects of Micro-grid Access on the Relay Protection of Power Distribution Network
QU Chaoqing
Abstract：The micro-grid access can reduce the network loss of the feeder and improve the reliability of power supply and energy efficiency.Now the internal structure of the micro-grid has become more and more complex.With lot of power supply devices connected to the micro-grid,in the event of a short circuit or open circuit fault,the relevant parameters of the current and voltage will have some changes,which will greatly increase the difficulty of fault location.This paper analyzes the micro-grid control mode and DG control under the grid-connected and off-grid state.By accurately positioning the fault type of distributed power supply and studying in detail the real-time status of the relay,we have established an equivalent model of inverter distributed generation under grid-connected operation and a distribution system model including micro-grid in PSCAD/EMTDC software aiming at the impact of the micro-grid access on the relay protection device of distribution network.
Keywords：micro-griddistributed generationenergy storage devicedistribution networkrelay protection
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 76-80 )