Abstract
Load sharing is one of the main concerns in AC microgrids (MGs) which should be treated differently in the presence of photovoltaic (PV) sources. There are two modes of operation for photovoltaic sources, namely, maximum power point tracking (MPPT) mode and DC link voltage control (DCLV) mode. When the total load of MGs is higher than the maximum power of the photovoltaic source, the PV source operates in the MPPT mode, while other sources share the remaining loads; otherwise, it should reduce its power to provide a balance between the generation and load sides by operation in the DCLV mode. Here, a new seamless approach for sharing the load among a photovoltaic (PV) generation system and other sources is proposed based on a conventional droop control method that helps the PV source to locally select its control mode in AC MGs. The proposed method helps the MG to extract as much photovoltaic power as possible while balancing the generations and load sides. The proposed method is simulated in the MATLAB/SIMULINK environment, and the results validate the feasibility of the proposed method.
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