Archivo para marzo 30th, 2016


Conceptual diagram of a dc-bus microgrid system

The dc-bus microgrid link the diferent component of the microgrid both loads as sources. The figure is a general representation with conextion to AC-grid, wind turbine, PV solar plant, DC and AC loads, Batteries, fluwheel, micro turbine, AC/DC converser, DC/AC converser and DC/DC converser.

Source:
S. Vimalraj, P. Somasundaram, “Fault Detection, Isolation and Identification of Fault Location in Low-Voltage DC Ring Bus Microgrid System,” Int. J. Advanced Res. in Electrical, Electronics and Instr. Eng. vol. 3, special iss. 2, pp: 570-582, Apr. 2014

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The schematic diagram for the dc micro-grid proposal for Bangladesh

In this system, a PV-diesel hybrid concept with dc grid has been proposed where the PV panel is not placed in any central location but distributively placed on roof tops at conventional locations. The number of solar PVs placed on a roof is such that they can be connected directly to the grid. The diesel generator is needed to give support to the system during bad weather and reduce the battery storage for the system. Diesel generator is placed at a convenient location and in case of higher demand; several diesel generators could be installed at the same place as per increased load demand. Diesel generators would be connected to the grid via ac-dc converters. A battery may be placed to store the power generated from diesel generator. Each consumer is connected to the grid and is metered for the energy consumed. Schematic diagram of a dc micro grid and a typical setup inside the consumer premises is shown in Figure. A consumer will have a dc-dc converter to convert the high grid voltage to nominal 12 V and charge a battery set up individually at the premises to store energy. It may be mentioned here that the charge controller to protect the battery is built inside the converter. During the day time, solar panels will produce output to be stored in the batteries of the individual customers. The size of the batteries will be deduced as per their energy demand. The customer has two options so far the household loads are connected-he/she can use all dc loads or can use an inverter (similar to an IPS) to have 240 Vac load in his house. This option will be useful when the actual power consumption by some of the consumers (well off consumers) are high and rich enough to use household gadgets like fridge, TV etc.

Source:
Syed Enam Reza, Mou Mahmood, A. S. M Kalkobad, Ehasanul Kabir, Nahid-ur-Rahman Chowdhury, “A Novel Load Distribution Technique of DC Micro-Grid Scheme on PV-Diesel Hybrid System for Remote Areas of Bangladesh,” Int. J. Scient. & Tech. Res., vol 2, issue 1, pp: 133-137, Jan. 2013