The DC microgrid based on modular PV generation system

The DC bus coupled microgrid investigated in this paper is shown in Fig. 1. DC/DC converters for PV modules, a bidirectional DC/DC converter for battery, a bi-directional DC/AC converter and local loads share a DC bus. The modular photovoltaic generation system is the key element in this DC microgrid, which consists of three DC/DC converters with modular design and same ratings. These  modular converters transfer the power generated by PV arrays to DC bus. The battery with bi-directional DC/DC
converter is used to balance the power differences between PV power supplies and local loads in islanding mode. The local loads include the auxiliary power supplies for microgrid operations, such as control/monitoring of PV arrays, battery monitoring, control/driving of converters. The bi-directional DC/AC converter is used to realize the connection between DC microgrid and AC grid

Li Zhan, Tianjin Wu, Yan Xing, Kai Sun, Josep M. Guerrero. “Power Control of DC Microgrid Using DC Bus Signaling”. Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE.



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