Digital Simulation for Distribution Network with Large-Scale Distributed Energy Resources

Distributed energy resources (DERs) have the characteristic of natural fluctuation. Since most of DERs are connected to the grid through the converter, it will bring a series of power quality problems to the power distribution network, such as reverse power flow, overload of power line, courts overvoltage and harmonic disturbance. To realize the safe and economical consumption of high permeability DERs, China Southern Power Grid has carried out a series of research on grid digitization. From a posteriori inspection of distribution network status to real-time awareness, it has accumulated a large number of effective features that can effectively reflect the operating status of distribution network and key equipment. To show the advantages of digital grid and improve the management level of distribution network, it is important to build a digital simulation platform of distribution network. Then the obtained pre-perception information of the operating state will provide guidance for the planning, operation and maintenance of the distribution network.