Archivo para febrero 13th, 2016


Simplified layout of a dc microgrid

The dc microgrid considered is schematically shown in Fig. As for a typical dc microgrid, it consists of the following mainelements:
• variable (nondeterministic) generations and, in this example, a wind turbine using permanent-magnet synchronous generator (PMSG); the maximum power output from the wind turbine is largely determined by the wind condition;
• controlled (deterministic) generation (e.g., a diesel generator or with ac grid connection); as shown in Fig, the dc grid in this example is connected to an external ac system via a dc-ac converter which provides bidirectionalpower-flow capability;
• variable loads with different characteristics; a number of ac and dc loads can be anticipated (e.g., ac loads via dc-ac inverters, dc loads via dc-dc converters, and direct-connected dc loads, etc.);
• energy storage (ES) system to accommodate the presence of variable generation and load, and the requirement of possible island operation (i.e., connection to the external ac system being lost)

Reference:
Lie Xu, Dong Chen. “Control and Operation of a DC Microgrid With Variable Generation and Energy Storage”. IEEE Transactions on Power Delivery, Vol. 26, No. 4, October 2011

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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

Reference:
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.


Configuration of a dc microgrid application system

This DC microgrid have three photovoltaic solar plant, pne DC load, battery bank and microsource with DC/AC 3 -Phase Bi-directional Inverter, all components conected to DC bus of microgrid. Great !!

Reference:
T. F. Wu, C. H. Chang, L. C. Lin and Y. C. Chang. “DC-Bus Voltage Control for Three-Phase Bi-directional Inverter in DC Microgrid Applications”. Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE