Valentine K.,Cornell University |
Valentine K.,New Energy Solutions |
Temple W.,Advanced Digital science Center |
Thomas R.J.,Cornell University |
Zhang K.M.,Cornell University
International Journal of Electrical Power and Energy Systems | Year: 2016
This study investigates the technological and economic relationships of integrating wind power, plug-in electric vehicles (PEVs) and mixtures of Level 1/Level 2 charger infrastructures in New York Independent System Operator's (NYISO's) two-settlement wholesale electric energy market. Using 7560 scenarios constructed from various PEV penetrations, Level 2 charging and wind dispatch policies, this study reports findings that substantiate and challenge aspects of the previously envisioned synergy between wind power, PEVs and charging infrastructure. An econometric model based on historical market data, including system-level costs of load ramps, was used to study resource integration and to avoid data fidelity issues that plague traditional fundamentals-based models. Results show: (1) the existence of time-series correlation between PEV charging and wind dispatch depends on curtailment policy, (2) PEV charging with wind over-forecast nearly triples the rate of reduction in curtailed wind energy compared to under-forecast, (3) using wholesale energy cost as metric, PEVs can be adversely coupled to curtailable wind, and decoupled with must-take wind, and (4) PEV penetration, Level 2 charging and wind power may be economic substitutes in the energy market. © 2016 Elsevier Ltd. All rights reserved. Source
Zhou H.,Norwegian University of Science and Technology |
Wang X.,Norwegian University of Science and Technology |
Sheridan E.,New Energy Solutions |
Chen D.,Norwegian University of Science and Technology
ChemSusChem | Year: 2015
Huge irreversible capacity loss prevents the successful use of metal oxide anodes in Li-ion full cells. Here, we focus on the critical prelithiation step and demonstrate the challenge of electrolyte decomposition on a pristine anode in a full cell. Both an electrochemical activation process (54h) with Li metal and a new electrolytic process (75min) without Li metal were used to preform complete solid electrolyte interphase (SEI) layers on 3D binder-free MnOy-based anodes. The preformed SEI layers mitigated the electrolyte decomposition effectively and widened the working voltage for the MnOy/LiMn2O4 full cell, which resulted in a big boost of the specific energy to 300 and 200Whkgcathode -1, largely improved cycling stability, and much higher specific power (4200Whkgtotal -1) compared to conventional Li-ion batteries. Detailed characterization, such as cyclic voltammetry, scanning transmission electron microscopy, and FTIR spectroscopy, gives mechanistic insight into SEI preformation. This work provides guidance for the design of anode SEI layers and enables the application of oxides for Li-ion battery full cells. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
Marcu A.,Daimler AG |
Toth G.,Daimler AG |
Kundu S.,Automotive Fuel Cell Cooperation |
Colmenares L.C.,University of Ulm |
And 2 more authors.
Journal of Power Sources | Year: 2012
The paper introduces a novel ex situ test procedure that was developed to quantify the ageing of catalyst layers under critical automotive fuel cell conditions during start-up/shut-down phases. It is based on liquid electrolyte measurements, using a thin film catalyst electrode. The overall degradation under start-up/shut-down conditions is assessed by the decay in electrochemically active surface area. Furthermore, contributions from different processes leading to catalyst degradation such as Pt dissolution and Pt particle growth/agglomeration can be separated. Finally, using a differential electrochemical mass spectrometry (DEMS) set-up, also the extent and role of carbon corrosion under these conditions is accessible. The potential of this, compared to in situ fuel cell stack tests, rather fast and less costly ex situ test procedure is demonstrated in measurements using a commercial, graphitized carbon-supported Pt catalyst. The results of the degradation test and in particular the contributions from different degradation processes such as Pt dissolution, Pt particle growth/agglomeration and carbon corrosion during different stages of catalyst ageing are discussed. © 2012 Elsevier B.V. All rights reserved. Source
News Article | December 7, 2015
Siemens has been contracted to supply 30 MW of wind turbines to what will be, upon completion, the world’s largest floating wind farm. Siemens made the announcement last week, revealing that it had been contracted by Norwegian company Statoil to provide five of its SWT-6.0-154 direct drive offshore wind turbines for the 30 MW Hywind Scotland Project, an offshore floating wind project that is being developed 2 kilometers off the coast of Peterhead, in Aberdeenshire, Scotland. The offshore wind turbines will be built upon floating foundations in water depths between 90 and 120 meters, and is expected to reach completion in the first half of 2017. “We are proud to once again be on board the floating wind project with Statoil, and to apply the experience we gained with the first full scale floating turbine,” said Morten Rasmussen, Head of Technology at Siemens Wind Power and Renewables Division. “Hywind Scotland is another pioneering project and has the potential to become a trailblazer for future floating wind projects.” The Hywind project is a Scottish pilot project for floating offshore wind parks, and aims to prove that they “can be both cost efficient and low risk.” In line with this, Siemens’ SWT-6.0-154 direct drive offshore wind turbine was chosen for its lightweight nacelles, which are perfectly suited for offshore floating wind applications. The project was approved by the Scottish Government at the beginning of last month at the same time as Statoil made its own final investment decision to build the project. “Statoil is proud to develop the world’s first floating wind farm,” said Irene Rummelhoff, Statoil’s executive vice president for New Energy Solutions. “Our objective with the Hywind pilot park is to demonstrate the feasibility of future commercial, utility-scale floating wind farms. This will further increase the global market potential for offshore wind energy, contributing to realising our ambition of profitable growth in renewable energy and other low-carbon solutions.” Get CleanTechnica’s 1st (completely free) electric car report → “Electric Cars: What Early Adopters & First Followers Want.” Come attend CleanTechnica’s 1st “Cleantech Revolution Tour” event → in Berlin, Germany, April 9–10. Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.
What does it take to truly change a large utility? Not just cosmetic changes to branding -- but true structural changes around distributed energy deployment and customized offerings for customers. In this week's show, we’ll talk with an industry veteran who’s trying to usher in those changes. Ed White, vice president of New Energy Solutions at National Grid, joins the Gang to discuss the utility's new plan to integrate solar, efficiency, storage, electric cars and grid automation all into one area of the business. It's not an easy task. But we'll talk with White about how he hopes to pull it off. Later in the show, we'll discuss two major Supreme Court decisions on demand response and Obama's landmark climate rule. And we'll finish with a quick discussion of the positive outcome of California's net metering debate.