Dynamic modeling and simulation analysis on micro-grid based on DIgSILENT

In this paper, dynamic models of main micro-generation sources are described and built based on their mathematical model, in particular, the models of Micro-turbine, Wind turbine with full rated converter, Photovoltaic Systems and Battery Energy Storage System (BESS). In addition, control mode of their power electronic interfaces are given and analyzed based on the characteristic of Distributed Generations (DGS). A micro-grid adopting peer-to-peer control mode is then built comprising these micro-generation source and a battery energy storage system. Dynamic characteristics of frequency response and voltage response are made under operating mode switch of micro-grid between grid connected mode and islanded mode. According to the simulation case study, the battery energy storage system using droop control is essential to the micro-grid in islanded, which can increase the speed of response of micro-grid efficiently.