High Efficient Solar Energy Harvesting for Bihar Green Energy Initiative

2011 Vol 12

High Efficient Solar Energy Harvesting for Bihar Green Energy Initiative

Ranjan K. Behera

Department of Electrical Engineering

Indian Institute of Technology, Patna, Bihar, India

ABSTRACT As the cost of conventional energy sources continues to increase, alternative energy sources continue to gain in popularity beyond expectation and in this way to reduce environmental pollution. Alternative energy sources, such as Photovoltaic (PV) and Fuel Cell (FC), application is increasing day by day to meet the increased electrical load demand. Particularly, in stand-alone power supply system, powering the electrical load requirement and powering more number of electrical grids is one of the up-coming fields. In India especially in Bihar and Orissa, most of the rural areas are disconnected from the main power grid. Mostly it is in an isolated network, where electrical connection is impossible. To meet this power requirement in rural areas, the stand-alone PV system is the best choice. Although PV energy has received considerable attention over the last few decades, due to high installation cost and the low conversion efficiency of PV modules are the major obstacles to using this PV energy source on a large scale. Therefore, several studies are being developed in order to minimize these drawbacks of the existing system. In order to extract the maximum power of the PV array, the classical implementation of the maximum power point tracking (MPPT) in stand-alone systems is generally accomplished by the series connection of a dc–dc converter between the PV array and the load, the energy storage element or with a grid-tie inverter connected to grid. Considering that in the series connection, the dc–dc converter always processes all power generated, the total efficiency of the PV system greatly depends on the efficiency of this series dc–dc converter and grid-tie inverter. In order to improvement the system efficiency and reliability it is necessary to address suitable fault tolerant power electronics converters system for rural electrification. The power electronics converter topology should posses the ability of smart and intelligent load management and can be used for both isolated loads or grid connected system.

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