In microgrids, photovoltaic (PV) and storage are integrated as a droop-controlled ideal source, which is not practical and challenges the system efficiency. Instead, PV-storage can be allocated separately. This PV-storage independent system is more flexible and easier to optimize. But, the conventional PQ-controlled PVs rely on master voltage-controlled storage sources. In this paper, a novel operation mode is proposed for the PV-storage independent microgrids. PVs operate as current controlled voltage sources (CCVS). A maximum power point tracking (MPPT) based droop control scheme is introduced to explain the proposed operation mode. Thus, this mode enables PVs to supply an auxiliary service of frequency regulation and a maximum utilization of renewable energy. The small signal stability of entire system is analyzed to design the physical and control parameters. Finally, simulations are presented to verify the system effectiveness.
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Yuan et al. (2017) studied this question.
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