A modular control design for optimum harmonic compensation in micro-grids considering active and reactive power sharing

The core issues with Distributed Generation (DG) systems of today are the insertion of power quality threats, harmonic distortions to the main stream power system and inefficient power sharing leading to power fluctuation problem. This paper effectively sorts out the causes of power fluctuation in islanded mode of operation of micro-grids and presents an effective method for their optimum compensation. MATLAB/SIMULINK has been employed to simulate a distributed generation system, essentially a fuel cell based micro-grid. Sinusoidal Pulse Width Modulation (SPWM) technique for DC/AC conversion is well used. Droop control model, has been optimized to ensure optimum power sharing, in which output frequency and voltage of micro-source are controlled by droop and boost equations. This type of modular approach is of immense importance in reducing the system level harmonic content to a significant extent thereby maintaining standard power delivery to the distributed loads in accordance with IEEE standards.