Exploiting Photovoltaic Sources to Regulate Bus Voltage for DC Microgrids

DC microgrids are highly compatible with photovoltaic (PV) generation because of their direct-current properties. However, the increasing integration PV sources into microgrids, traditional maximum power point tracking (MPPT) algorithms may cause problems such as overvoltage and fluctuation, which makes it challenging to keep stability DC-bus voltage due intermittent stochastic nature PVs. Consequently, in order reduce investment maintenance costs storage systems, innovative control methods required for PVs provide regulation services. In this paper, a novel active (APC) strategy, based on characteristic curve fitting, is proposed flexibly regulate output power. The transient process performance robustness system improved APC strategy. Based it, V-P droop mechanism designed regulating (DVR) service microgrid. overall strategy unifies DVR function MPPT same structure; thus, source either works mode if at its nominal value, or exceeds it. Switching between autonomous, fully decentralized, improves efficiency well ensures fairness among different parallel sources. Case studies including real-world project analysis carried out validate feasibility effectiveness