Photovoltaic (PV) system is integrated in microgrids because of the ability to trap renewable energy as secondary power sources. In this paper, the decentralized control scheme is proposed based on the optimum offset voltage gain in order to extract equal power sharing of the distributed PV source converters within the permissible bus voltage regulation of low voltage DC Microgrid. Moreover, the impact of unequal cable line impedances of the distributed sources is compensated by utilizing the optimal offset voltage for constant power loads (CPLs). Hybrid Particle Swarm–Nelder–Mead (PSO–NM) optimization algorithm is utilized for the optimal value of the offset voltage gains and voltage controller parameters. The stability analysis of the DC system is also performed for a specified range of droop gains and CPLs. The control scheme is utilized a hysteresis current controller and proportional-integral controller for renewable energy sources without any communication link. Three PV sources based on the proposed control scheme are performed with resistive and CPLs in the MATLAB/Simulink environment and verified by experimental results on FPGA-based hardware-in-loop (HIL) on a real-time simulator.

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