International Journal of Renewable Energy Technology Research (IJRETR)

ISSN: 2325-3924 (Online)

Cover page

Vol. 5, No. 3, June 2016

Table of Contents



Evaluation of cyanobacteria bioenergy: a potential resource in Antarctica detected by Multi/Hyper-spectral satellite Image.

Authors: Carla Micheli*, Alessandro Belmonte, Vito Pignatelli, Luigi De Cecco, Viviana Piermattei, Marco Marcelli, Flavio Borfecchia

Pages: 1-11


This paper focuses on the natural conservation aspect of bioenergy conversion by polar cyanobacteria; they could represent a key requirement in the implementation of alternative renewable sources, since they have many advantages for fuel-level energy storage, particularly in polar habitat. We propose an innovative method for evaluating the potential bioenergy resource already existing in Antarctica, discovering cyanobacteria patches by remote sensing technique.
Cyanobacteria, which are considered potential precursors of liquid fuel and are alternative of bioenergy conversion, were collected in Antarctica during austral summer 2003. At the same time, in situ the microbial mat was identified by polar sensors (Hyperion, ALI and Lansat ETM+) having spectral/spatial resolution, which are able to detect photosynthetic pigments that change in these populations not available elsewhere and suitable for their effective change assessment capabilities. According to physiological, morphological and genetic features of collected samples, two groups of cyanobacteria (included in Nostocales and Oscillatoriales orders) were identified and, simultaneously mapped at three Antarctic stations Terranova Bay, Enigma Lake and Icaro in relation to pigment spectral responses to hyperspectral signatures. At the beginning of the 3rd era, the emergent need for an energetic biomass at an international level is highlighted using careful site selection and application of appropriate methods. Thus, in our results the technology links the perspective of knowledge of biomass as energy budget in the Antarctic ecosystem, together with the monitoring of integrated analyses of whole ecosystems from space.

Keywords: Cyanobacteria biomass and bioenergy conversion, Polar Hyperspectral Remote Sensing, Pigment spectral responses, Energy management, Photosynthetic microorganisms, Antarctica,


An Analysis for Repowering Prospects of Jamgodarani Wind Farm using WAsP

Authors: Manoj Verma, Siraj Ahmed,J.L.Bhagoria



Contamination of environment caused by the discharges of greenhouse gasses and other toxic elements such as Sulfur Dioxide) Nitrogen Oxidesbrought on by fossil fuel utilization are major threat to sustainable development. With renewable energy sources, no contaminating byproducts are discharged into the environment. Hence, utilizing these sources on a substantial scale is a key to diminishing environmental contamination. Besides, government targeting that significant percentage of total power production to be renewable. This study depicts cost/production viewpoints, of the repowering procedure for the wind farms. Repowering can produce significantly more power with less number of turbines. This procedure was the consequence of a developing interest for renewable energies, encouraged by the availability of wind energy in many region of India. However this paper focuses on Jamgodrani wind farm power project M.P. The wind farms concentrated on in this work were situated up before 1998 and they had out of date apparatus with low power. The study/simulation in this paper shows strong evidences that repowering is a productive attempt for such old wind farms.

Keywords: Wind Farm Repowering, Renewable Energy, WAsP.


Effect of Control of pH in Anaerobic Digestion of Organic Fraction of Municipal Solid Waste

Authors: Aich A , Ghosh S K



 In anaerobic digestion of organic fraction of municipal solid waste , large amounts of volatile fatty acids are formed during the initial stages (hydrolysis and acidogenesis) of decomposition.  This acidifies the substrate and inhibits the methanization process, which results in longer hydraulic retention time . In this study, experiments were were carried out to study the effect of control of pH in aerobic digestion of organic fraction of municipal solid waste (OFMSW) by using two identical model laboratory-scale digesters. The digesters were fed with the same feed material (OFMSW). In one digester, pH was not controlled and in the other pH was controlled by the addition of Na(OH) . All other conditions were kept identical for both the digesters. The performances of the digesters were evaluated based on the biogas production rate and pH conditions. Experimental results revealed that the hydraulic retention time of AD reaction could be reduced by at least 7 days and the overall efficiency of gas production of the digester could be increased  by more than 24 % (at 60 days time) by the direct control of pH in the digester. From this study, it can be concluded that control of pH in the digester increases the efficiency of anaerobic digestion.

Keywords: Anaerobic Digestion¨  Acidogenesis¨  Acetogenesis¨ HRT¨ Hydrolysis¨ Methanogenesis¨ OFMSW


Experimental investigation on two configurationof vertical axis wind turbine

Authors: S. Gaudham Babu*, M. Gopala Krishnan, C. Panneerselvam



     The main objective of work is to compare the two proposed configurations ofvertical axis wind turbine with and without load condition.Fabrication of two proposed configuration of same capacity of 150W and testing rpm for the model, for various wind velocity and comparing power obtained. Performance of VAWT such as coefficient of power is flow around the blade. A great degree of design versatility in vertical axis turbine gives theeconomically viable energy solution for remote area, by analysing a drawback such aspoor self- starting, low initial torque and low coefficient of power should be overcomefor majority of wind generation in vertical axis type. Vertical axis turbine has variousconfigurations in nature. However there will certain advantages and disadvantageswith different configurations, Horizontal axis turbine is used in wind powergeneration, VAWT due to lower efficiency they are not used majorly in powergeneration but VAWT has certain advantages over HAWT such as operationalindependence of wind direction owing to its vertical axis operation it does not requireyaw mechanism, simplicity in construction and maintenance. A detailed review on various configurations available till now and the work done on the each configurationmust be studied. The various parameter that must be analysed thoroughly for theperformance improvement include type of blade, number of blade and blade angle,Tip-speed ratio and forces acting on the blade with respect to the wind velocity andaltitude of wind turbine.

Keywords: Savonius; Tip-speed ratio; CP

High Efficiency Single-stage Grid-tied PVInverter for Renewable Energy System

Authors: P.Saravana Kumar, P.Booma Devi



The inverter is operated from a boost cascaded with buck converter along with a line frequency unfolding circuit. that its novel operating modes, high efficiency can be achieved because there is only one switch operating at high frequency at the time, and the converter allows the use of power MOSFET and ultra-fast reverse recovery diode. This dissertation begins with a theoretical analysis and modeling of this boost-buck converter based inverter. And the model indicates small boost inductance it will leads to increase the resonant pole frequency and decrease the peak of Q, which help the system will be controlled easier and more stable. Thus, interleaved multiple phase’s structure is proposed to have small equivalent inductance, system while the ripple can be decreased, and the inductor size can be reduced as well. The two-phase interleaved inverter is then designed accordingly. The double-carrier modulation method is proposed based on the solar grid connected inverter’s operation mode. The duty cycle for buck switch is always one if the inverter is running in boost mode. Mainly the duty cycle for boost switches are always zero if the inverter is running in buck mode. Because of this, the carrier for a boost mode is stacked on the top of the carrier for buck mode, as a result, there is no need to compare the input and output voltage is to decide which mode the inverter should operate in. And the inverter system operates smoothly between these two modes. Based on the similar concept, three advanced modulation methods are proposed. One carrier concept can help further improve the efficiency, and one of them can help increase the bandwidth and gain, and the last one takes model the advantage of both. Finally, the simulation and experiment results are shown to verify the concept and the system tested CEC (California Energy Commission) efficiency is 97.4%. the performs up to 2% more efficiently better than the conventional solution.

Keywords: Maximum power point Tracking, H5 Topology, interleaved inverter, SCR Bridge.