A Series-Parallel Pv-Storage Independent Microgrid And Its Decentralized Control

This paper presents a series-parallel photovoltaic (PV)-storage independent microgrid (MG), where low-voltage distributed generation units could be connected to power grid conveniently. Moreover, it provides a promising way to form medium voltage MG. For this proposed structure, a decentralized control is proposed. The PV units are controlled by a maximum power point tracking (MPPT)-based droop control, where MPPT of the PV units is achieved. Storage units are regulated via a "droop" controller dependent its reactive power polarity and take the responsibility of keeping the power supply-demand balance of the MG. Since all these controllers make decisions only based on their local information, the proposed control is reliable and cost-effective. Moreover, the small-signal stability of the system is proved. And simulation results are presented to verify the effectiveness.