Power quality analysis of hybrid ac/dc microgrid in distribution network

Abstract

Microgrid is a complex structure which is a localized group of electricity generation, storage and load which usually operates connected to a macrogrid. The quality of power delivered to the grid during interconnection is one of the key factors which determine the reliability of the microgrid and is affected due to various reasons which include electronic components that leads to equipment overheating, excessive neutral currents etc., which can cause voltage dip, flicker and unbalance voltage at the end user. The power quality level in microgrid has to be quantized and necessary analysis has to be done to investigate the power quality impact in microgrid network. In this paper the analysis of THD of the hybrid system with PV and DFIG in grid connected and islanded mode is studied using MATLAB/SIMULINK. It is found that the THD is reduced when both PV and wind are connected to the grid and increases when isolated. The major advantage of this analysis emphasizes that this system can be applied for highly nonlinear and variable PV and wind systems connected together with the grid. Simulation results also shows that this system is effective for microgrid with varying inputs.