Interlinking Converter of Hybrid AC/DC Microgrid as an Active Power Filter

Nowadays, AC/DC hybrid microgrids are introduced as a possibilistic approach to aggregate the distributed generations, energy storage systems, and AC/DC load. Controlling of the hybrid microgrids is quite challenging and the main challenge is to ensure a precise power division between the two AC and DC sides. In hybrid microgrids, interlinking converters can also provide the compensability of the harmonics of the AC side and utility grid. To lessen the initial investments and volume, reduce maintenance costs, and improve the converter efficiency in the microgrid, this letter uses the multifunctionality concept to design a simpler control system for interlinking converter of the grid connected hybrid microgrid. The multifunctionality control system can balance the produced power, compensate the current harmonics caused by the grid-side nonlinear load, and fix the DC bus voltage. The multifunctional control implements in the synchronous reference frame by cascade control loops and the PI and hysteresis controller are used to control the voltage and current loops respectively. Simulation results verify the acceptable performance of the proposed control system.