Single Solution for Control and Synchronization of Inverters in Microgrids

The primary focus of this paper is to propose the control and synchronization of inverter usage in microgrids. The crucial issues in the parallel operation of inverters are accurate proportional load sharing and voltage control. A well-known droop technique has been employed widely due to its simple structure & wireless control. This manuscript focuses on limitations of conventional droop control (CDC) and and its remedial measures through bolting regulator on its control loop. Further efforts have been made to incorporate synchronization mechanism into the droop control by resembling its structure with Phase locked loop (PLL). Small signal stability analysis is also presented to ensure stable steady state operation. A comparison of output voltages, shared power ratios have been made for unequal per unit internal impedances of parallel operated R inverters (equipped with and without regulator) through the time domain simulations.