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Yadav P.,Pandit Deendayal Petroleum University | Pandey K.,Pandit Deendayal Petroleum University | Tripathi B.,Pandit Deendayal Petroleum University | Kumar C.M.,Tata Power Solar | And 3 more authors.
Solar Energy | Year: 2015

This article focuses on the identification of key features that are responsible for the discrepancies in the performance of silicon solar cells fabricated on multicrystalline silicon under the identical conditions. In an experimental approach, direct current (DC) measurement coupled with alternating current (AC) characterisation technique has been employed. The scanning electron microscope analysis reveals an average grain size of few micrometres for all the solar cells and the top surface of least efficient solar cell contains the impurity precipitates with deep cone shaped holes or pits. The DC measurement reveals that the photocurrent density loss follows an exponential behaviour with respect to the current-voltage characteristics for all the solar cells. The analysis of -dV/dJ versus (JSC-J)-1 plot and the variation of ideality factor with junction voltage demonstrate that the higher resistive and recombination losses dominate the performance of least efficient solar cell. Impedance Spectroscopy (IS) technique is used to quantify and decouple the various photovoltaic parameters associated with the different physical processes. A lower value of shunt resistance and minority carrier lifetime along with the higher value of series resistance contribute to the higher resistive loss and surface recombination. The experimental results along with the analytical model provide an insight into the loss mechanisms and the use of a simple tool that can be integrated with the conventional photovoltaic testing. © 2015 Elsevier Ltd. Source

PosannapetaY G.R.,Tata Power Solar
Journal of Electrical Engineering | Year: 2015

This concept is suitable at unavailability of net-metering systems for captive consumption grid connected solar power plants. It presents an overview of the state of the art of grid export issue for PV inverters at low and medium level solar power plants, mainly intended for rooftop applications. The paper focuses on-site problem and challenges to stop the grid-export issue at under-loaded conditions of self consumers of grid-tied solar power plants. The topology without bidirectional inverters has big advantages like low cost, volume and maintenance. In addition, it often reaches higher priority than topologies with bidirectional inverters. Therefore the new concepts are important for future developments. Source

Sharma A.K.,Indian Institute of Technology Delhi | Sharma A.K.,Indian Institute of Technology Bombay | Priyadarshini B.G.,Indian Institute of Technology Delhi | Priyadarshini B.G.,PSG College of Technology | And 2 more authors.
RSC Advances | Year: 2015

A new anti-reflection coating based on amorphous barium titanate (a-BTO) was developed using RF magnetron sputtering technique. Systematic studies on the structural and optical properties were carried on a-BTO thin films deposited on polished Si and textured Si substrates. In the visible range of the solar spectrum, the refractive index was found to be 2.02-1.91 with high transmittance of greater than 85%. Maximum reduction in the reflectance for a-BTO on polished Si and textured Si substrates was found to be 100% (at 550 nm) and 85% (at 400 nm), respectively. Further, improvement in cell efficiency of a Si solar cell with a-BTO anti-reflection coating was found with an increase from 9.3% to 10% accompanied by improvements in overall performance parameters such as short circuit density (Jsc), open circuit voltage (Voc) and fill factor (FF). These results indicate that an a-BTO thin film deposited using RF magnetron sputtering can be used as an alternative anti-reflection coating for Si based photovoltaic cells. © The Royal Society of Chemistry 2015. Source

News Article | April 23, 2015
Site: news.siliconindia.com

BANGALORE: Tata Power Solar and Manipal University today showcased the prototype of a solar electric car. The car was designed by Manipal University’s students’ twenty-seven member SolarMobile Team, in collaboration with Tata Power Solar who produced the solar panels. The project was named SERVe short for Solar Electric Road Vehicle. The two-seater car weighs 590 Kg and the solar panels weigh just 35 kg (half the weight of conventional solar panels) and provide up to 960 watts of power. The car was designed keeping mobility and commercial viability in mind, so the solar panels have been built to fit around the car's curved shape. This enhances the aerodynamics of the vehicle and enables it to maintain a high performance. The car has a direct solar drive that maintains the cruising speed of 30kmph and is supplemented by extra power from a high-end energy storage system. The car has a top speed of 60 kmph. S. P Giridhar Kini, associate director, Manipal University, says “We are extremely happy to see how our students have combined their passion for green energy, through the launch of SERVe. The industry-academia collaboration is the key to foster innovation among the students. Hence, working with corporates like Tata Power Solar helped our students get technical support and knowledge transfer.” Tata Power Solar managing director and chief executive, Ashish Khanna also responded to economic times,”the project epitomizes our belief in innovation. We not only encourage innovation within our organization but also propagate university participation for this cause.” Also Read: Net Neutrality: NASSCOM Calls for Level Playing Field for Startups Join Twitter Geography Trivia From Space

News Article | February 24, 2015
Site: businesswireindia.com

ABB India became the first company to reach sales of a cumulative capacity of 1GW solar inverters. This milestone was marked today with the roll out of an order for Tata Power Solar’s project for Kiran Energy Solar Power. ABB India commenced local manufacturing of solar inverters in 2012 and has since grown in partnership with key industry customers. Technology leadership complemented with competent indigenization and reliable service, helped ABB India to quickly achieve and maintain pole position in the market over the last three years. The cumulative installed base for central inverters in India reached 3GW in 2014. “Despite having the fifth largest generation capacity in the world, a third of our population has no access to electricity. We hope to be a key component in India’s solar powered future through our solutions spanning the entire solar value chain,” said Bazmi Husain, Managing Director, ABB India. “The ambitious target set for solar power generation capacity in the country – 100GW by 2022 – makes it imperative to leverage all avenues available, be it 300 days of sunshine or opting for efficient and quality components deployed across solar projects.” Changes were made in ABB’s product design keeping in mind the local requirements like demanding environments of high temperatures, dust and humidity. Solar power has great potential to lead the charge of renewables and is rapidly approaching grid parity in many countries. It is emerging to be a key contributor in the energy mix and the government’s drive to provide access to electricity for all. This positions ABB India well in an industry that is set for 10 percent plus annual growth in the country. “Being an early adopter of the latest inverter technology, we collaborated with ABB India from their initial years. Their understanding of the market and reliable product suite has made them a valuable partner in our operations,” said Dr. Arul Shanmugasundram, EVP Projects and Chief Technology Officer, Tata Power Solar. “We look forward to a more comprehensive association in the coming years.” ABB is the leading global supplier of solar photovoltaic (PV) inverters, which play a key role in converting the sun’s energy into electric current. Solar inverters convert solar power direct current (DC) to alternating current (AC) for transmission and distribution. ABB solar inverters improve reliability, efficiency and ease of installations. The inverters range from 100 kW to 1,000 kW and are optimized for cost-efficient multi-megawatt power plants. One gigawatt (1 billion watts) is enough to power up to ~750,000 households, as per western averages. Pushing the renewables envelope, ABB is extending a technological partnership with the pioneering Solar Impulse. On its maiden round-the-world journey – without using a drop of fuel – the solar powered plane stops over in Ahmedabad and Varanasi early this March. This endeavour is not only about pushing the boundaries of aviation but of innovation and what solar power can make possible for the human race, a natural extension of ABB’s ambition of power and productivity for a better world. ABB (www.abb.com) is a leader in power and automation technologies that enable utility and industry customers to improve their performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries and employs about 140,000 people. Photo caption: Mr. Bazmi Husain – Managing Director, ABB India at the announcement of the 1GW milestone achievement  in the solar power Industry

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