Harvesting Electricity: Triboelectric Generators Capture Wasted Power

submitted by: nsf

With one stomp of his foot, Zhong Lin Wang illuminates a thousand LED bulbs--with no batteries or power cord. A professor at the Georgia Institute of Technology, Wang is using what’s technically known as the triboelectric effect to create surprising amounts of electric power by rubbing or touching two different materials together.

Source: Georgia Institute of Technology

Drive Train Innovations for the Next Generation of Wind Turbines

submitted by: RASEIBoulder
Summary: As tax credits expire for wind energy, the ability to compete with established energy sources is critical. All wind turbine manufacturers are examining their next generation turbines with an eye towards reducing their cost, increasing energy production, and improving reliability. Because the drive train accounts for such a large part of the rotor nacelle assembly cost, it has become a prime target for design change. Drive train innovations which reduce cost, increase energy...

Approaches to Evaluating and Improving Lithium-Ion Battery Safety

submitted by: RASEIBoulder
As lithium-ion battery technologies mature, the size and energy of these systems continues to increase for emerging applications in transportation, grid storage, military use and aerospace. In fact, broadening the application space for lithium-ion batteries from the consumer electronics industries to these emerging markets increases their size from 1-50 Wh batteries for smart phones and laptops to >50 kWh for electric vehicles (EVs) and MWh scale for utility storage systems. As these...

Making Most of the Absorbed Photon: New Insights into Carrier Multiplication in Semiconductor Nanostructures

submitted by: RASEIBoulder
Carrier multiplication (CM) or multiexciton generation (MEG) is a process whereby absorption of a single photon produces multiple electron-hole pairs (excitons). CM could benefit a number of solar-energy conversion technologies, most notably photocatalysis and photovoltaics. This presentation overviews recent progress in understanding of the CM process in semiconductor nanocrystals, motivated by an outstanding challenge in this field - the lack of capability to quickly discern between...

Control of Power Inverters in Renewable Energy and Smart Grid Integration

submitted by: RASEIBoulder
Summary: Renewable energy sources have been regarded as the most promising means to solve the energy and environmental issues we face nowadays. How to integrate renewable energy into smart grids presents many challenging problems in control and power electronics. A well-integrated smart grid provides the backbone for the high-level functions of smart grids, such as wide-area control, communication, information, marketing and security. In this talk, an overview of the enabling technologies...

Excitons and Plasmons in Nanoscale Systems

submitted by: RASEIBoulder
Summary: Due to growing populace and standard of living, many terawatts of energy will be needed in the near future. The sun is the largest source of carbon-neutral and renewable energy that we have available and it is the only source that can provide terawatts of energy without depleting rapidly or causing major environmental and climate concerns. To fulfill this role, revolutionary approaches to solar energy conversion are needed that provide energy at very high efficiency at very low...

Modeling, Monitoring and Control of Wind Turbine Drive-trains

submitted by: RASEIBoulder
Summary: The wind turbine drive‐train is an integral part of the turbine that converts rotational kinetic energy from the wind to electrical energy. Ensuring reliable and robust operation of the drive‐train necessitates developing an accurate dynamic response model that includes its aero‐dynamic interaction with the wind, torsional and translational responses of its mechanical components, as well as electro‐mechanical interaction at the generator. This presentation will describe a...

Control of Wind Turbines: Accomplishments and Continuing Challenges

submitted by: RASEIBoulder
Wind energy is recognized worldwide as cost-effective and environmentally friendly and is among the world's fastest-growing sources of electrical energy. Despite the amazing growth in global wind power installations in recent years, science and engineering challenges still exist. Megawatt wind turbines are large, flexible structures that operate in uncertain, time-varying wind and weather conditions and lend themselves nicely to advanced control solutions. Advanced controllers can help...

U.S. Wind Energy Challenges and Opportunities

submitted by: RASEIBoulder
Robert Gramlich is Senior Vice President of Public Policy for the American Wind Energy Association, the national trade association of approximately 2,500 entities involved in all aspects of wind energy production, based in Washington D.C. Rob joined AWEA in 2005 and now leads the association’s strategic initiatives related to federal and state legislation, industry information and analysis, and regulatory policy. He has published articles on wind integration, carbon taxes, market power...

Using Renewable Hybrid Power Systems to Meet Off-Grid Community and Commercial Energy Needs

submitted by: RASEIBoulder
Summary: Diesel generators are the traditional means by which people generate electricity in remote locations. Throughout the world, there are many thousands of off-grid communities, industrial sites, and government facilities relying entirely on diesel generated electricity. At $4/gallon, the fuel component alone of diesel-generated electricity is high, about $0.30/kWh. Some remote locations pay over $8/gallon or $0.60/kWh. With diesel fuel prices projected to rise even higher in the long...