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Datta. S. Chavan

Bio: Datta. S. Chavan is an academic researcher from Bharati Vidyapeeth University. The author has contributed to research in topics: Turbine & Wind power. The author has an hindex of 10, co-authored 44 publications receiving 294 citations. Previous affiliations of Datta. S. Chavan include College of Engineering, Pune & University College of Engineering.

Papers
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Proceedings ArticleDOI
15 Oct 2013
TL;DR: In this paper, a new parameter vertical wind shear is also considered while computing the flicker emission severity and experimental results are of a turbine installed at Village Nimgaon Mhalungi, Tal. Shirur, District Pune, India.
Abstract: Scarcity of electric power, in developing countries like India, demands more generation of electric power. The conventional means of generating power are much time consuming and hence it is necessary to utilize renewable energy sources like wind, solar etc. Wind is intermittent in nature. It is not possible to predict exact wind speed because of the continuously changing climatic conditions. So flicker i.e. change in voltage is produced because of change in wind speed. It creates nuisance to the consumers. Consumers observe flicker in light of the incandescent lamp. So it is very difficult to read in that light source. So it is necessary to quantify and reduce the flicker emission severity produced by wind turbine. Now a days while computing flicker emission severity, only wind speed and grid impedance phase angle are considered. In this paper new parameter vertical wind shear is also considered while computing the flicker emission severity. Experimental results are of a turbine installed at Village Nimgaon Mhalungi, Tal. Shirur, District Pune, India.

36 citations

Proceedings ArticleDOI
20 Mar 2014
TL;DR: In this paper, the impact of turbulence on the flicker produced in a wind turbine which is sited on a hill surface is examined in a laboratory wind tunnel with small models of hills with different slopes and wind turbines.
Abstract: This paper bequeaths particulars of impact of turbulence on the flicker produced in the wind turbine which is sited on that surface. This is achieved in a laboratory wind tunnel with small models of hills with different slopes and wind turbine. Different shapes of models of hills placed in a laboratory wind tunnel. Wind turbines are tested for those conditions. The paper provides an empirical model to find flicker in terms of hill topography. The exquisiteness of the model is that, it is expedient to sundry types hills on which the turbine is sited. Validation of model is carried out with comparative graphs revealed with readings recorded on a turbine in tunnel.

31 citations

Proceedings ArticleDOI
06 Mar 2014
TL;DR: In this article, the impact of sea shore environment on vertical wind shear and congruently on flicker in wind turbine which is sited on that surface is reverberated.
Abstract: In this paper, specifics of impact of sea shore environment on vertical wind shear and congruently on flicker in wind turbine which is sited on that surface is reverberated. This is achieved in a laboratory wind tunnel with artificial surfaces created in a wind tunnel. The various surfaces imitated in the wind tunnel are sea sand of various sizes. Wind turbine is tested for these diverse types of surface roughness. Empirical model of flicker reflecting vertical wind shear at sea shore is established. Conjectures made while proposing the empirical model are reverberated. Boundary verges of the projected empirical model are echoed. Comparative graphs of flicker initiated due to vertical wind shear because of various sizes of sands on the seashore are portrayed. Values of flicker with projected empirical model and flicker from wind tunnel test are closer.

29 citations

Proceedings ArticleDOI
20 Mar 2014
TL;DR: In this article, the authors presented a newfangled empirical model to figure, flicker, instigated in the horizontal axis, upwind turbine, due to wind turbulence, in continuous operation.
Abstract: Paper presents a newfangled empirical model to figure, flicker, instigated in the horizontal axis, upwind turbine, due to wind turbulence, in continuous operation. Postulations, boundary curbs and limitations of the model are also depicted. In the proposed model, wind turbulence, number of blades, blade length and tower height are echoed. The exquisiteness of the model is that, it is expedient to range of heights of structures on which the turbine is sited. Validation of model is carried out with comparative graphs revealed after vigorous experimentation on a turbine in a tunnel with various heights of models of buildings.

28 citations

Proceedings ArticleDOI
12 Mar 2014
TL;DR: A mathematical model of flicker initiated in wind turbine mounted on a hill is developed with linear approach for a three bladed horizontal axis upwind wind turbine.
Abstract: Wind energy is now one of the prime renewable energy sources. Power quality of wind energy is one of the prime issues. In this paper model of flicker produced in a wind turbine mounted on a hill is deliberated. Vertical wind shear is one the important factors affecting flicker producing in wind turbine. In this paper mathematical model of flicker initiated in wind turbine mounted on a hill is developed with linear approach. The parameters considered for the development of the model are vertical wind shear, blade length, turbine height. Hill height and hill slope is also considered. The tower considered is tubular tower. The model is developed for a three bladed horizontal axis upwind wind turbine. The validation of the model is also done with experimentation.

27 citations


Cited by
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01 Nov 2000
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.
Abstract: The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.

2,437 citations

Journal ArticleDOI
TL;DR: In this paper, the authors highlight how the different bio-waste precursors affect the surface characteristics of the carbon nanostructures and outlined their subsequent effect on electrochemical performances.
Abstract: The ever-increasing demand for green and clean energy urge the development of cheap and efficient electrode materials for supercapacitors (SCs). In this context, several naturally abundant bio-wastes have been explored to develop porous carbons for SCs due to their easy availability, high performances, and simple processing methods. Although various BDCs are utilized for SC, the relation between the bio-waste precursor and resultant carbon materials are not very well understood. Here, we highlight how the different bio-waste precursors affect the surface characteristics of the carbon nanostructures and outlined their subsequent effect on electrochemical performances. Moreover, the surface modification of carbon materials using pre-processing, carbonization and activation methods is provided. The supercapacitive properties of activated carbons (AC) with their unique surface features derived from the different feedstock are systematically summarized. Finally, the challenges and future directions for the development of AC from bio-waste are discussed. Overall, this review provides a guide to understand how best to refine and carbonize this biomass to achieve optimum supercapacitive performance.

74 citations

Journal ArticleDOI
TL;DR: In this article, the authors provide an overview of the key technologies, functionalities, and requirements for supercapacitor management systems (SMSs), including issues related to the modeling, estimation, control, and protection of the super-capacitors.
Abstract: Recent advances in energy storage systems have speeded up the development of new technologies such as electric vehicles and renewable energy systems. In this respect, supercapacitors have gained interest due to their unique features such as high power density, long lifespan, and wide operating range. To achieve the high-voltage levels required for vehicular or utility applications, a supercapacitor pack should contain hundreds of high-capacity series-parallel cells. The internal states of these cells cannot be obtained by direct measurements and these states are usually affected by operating conditions such as temperature and noise. In addition, due to the uncertainty in the manufacturing processes, the characteristics between different batches or even the same batch of supercapacitor cells will be unavoidably different, which will impose significant challenges in terms of uniformity, functional safety, and durability of the system. Therefore, the supercapacitor pack will require a management system to effectively monitor, control, and protect the cells along all performance boundaries. Based on a comprehensive review of the latest articles and achievements in the field, as well as some useful previous experiences of the authors, this paper provides an overview of the key technologies, functionalities, and requirements for Supercapacitor Management Systems (SMSs). To the best of the author's knowledge, this is the first survey that provides an inclusive collection of key requirements for the SMS, including issues related to the modeling, estimation, control, and protection of the supercapacitors. The supercapacitor is a relatively new technology and no international standard about SMSs and their functional requirements are available up to date. The present survey will perfectly fill these gaps. In the survey, the key SMS requirements are broadly divided into the software and hardware functions, and several key issues including modeling and state estimation functions, control and balancing circuits, etc. Are covered. A comprehensive review of the supercapacitor/SMS vehicular applications is also provided in this paper.

44 citations

Proceedings ArticleDOI
20 Mar 2014
TL;DR: In this paper, the impact of turbulence on the flicker produced in a wind turbine which is sited on a hill surface is examined in a laboratory wind tunnel with small models of hills with different slopes and wind turbines.
Abstract: This paper bequeaths particulars of impact of turbulence on the flicker produced in the wind turbine which is sited on that surface. This is achieved in a laboratory wind tunnel with small models of hills with different slopes and wind turbine. Different shapes of models of hills placed in a laboratory wind tunnel. Wind turbines are tested for those conditions. The paper provides an empirical model to find flicker in terms of hill topography. The exquisiteness of the model is that, it is expedient to sundry types hills on which the turbine is sited. Validation of model is carried out with comparative graphs revealed with readings recorded on a turbine in tunnel.

31 citations

Proceedings ArticleDOI
06 Mar 2014
TL;DR: In this article, the impact of sea shore environment on vertical wind shear and congruently on flicker in wind turbine which is sited on that surface is reverberated.
Abstract: In this paper, specifics of impact of sea shore environment on vertical wind shear and congruently on flicker in wind turbine which is sited on that surface is reverberated. This is achieved in a laboratory wind tunnel with artificial surfaces created in a wind tunnel. The various surfaces imitated in the wind tunnel are sea sand of various sizes. Wind turbine is tested for these diverse types of surface roughness. Empirical model of flicker reflecting vertical wind shear at sea shore is established. Conjectures made while proposing the empirical model are reverberated. Boundary verges of the projected empirical model are echoed. Comparative graphs of flicker initiated due to vertical wind shear because of various sizes of sands on the seashore are portrayed. Values of flicker with projected empirical model and flicker from wind tunnel test are closer.

29 citations