Abstract
This paper presents a dual operational mode namely voltage control (VC) mode and current control (CC) mode of a microgrid that consisting of a photovoltaic (PV) array, battery energy storage (BES) and a diesel generator (DG) set. The functional features of this microgrid, are harmonics elimination, balancing of DG currents, reactive power compensation, DG set terminal voltage regulation and extraction of PV array maximum power etc. An automatic voltage regulator (AVR) is employed in the field circuit of a synchronous generator for controlling DG set terminal voltages. The voltage source converter (VSC) of the microgrid operates in VC mode in standalone (SA) operation and in CC mode in DG operation. The DG set in this microgrid, is used as an auxiliary energy source, which generates power only during low battery state of charge (SOC) and lower solar irradiation where the PV power is lower than the load power. This operation of microgrid ensures continuous supply to the connected loads without any interruption. A bidirectional DC-DC converter (BDC) is used to integrate the BES at the DC link terminals. Thus the second order harmonic during the unbalanced load is not fed to the battery hence it enhances the life of the battery. Simulated responses of proposed microgrid, are studied by using MATLAB/Simulink toolbox. The experimental performance of proposed system is carried out on a hardware prototype developed in the laboratory.
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