Topic
Electric power
About: Electric power is a research topic. Over the lifetime, 73036 publications have been published within this topic receiving 636991 citations.
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22 Sep 2010
TL;DR: In this paper, an electric power tool comprises a main body supporting a tool and an electric motor housed in the main body for driving the tool, and a plurality of indicators are configured to communicate information concerning the respective conditions of the attached first battery packs, arranged such that all of the indicators are simultaneously viewable by a user.
Abstract: An electric power tool comprises a main body supporting a tool and an electric motor housed in the main body for driving the tool. A plurality of first battery interfaces is configured to removably receive or attach a plurality of first battery packs and to electrically connect the plurality of attached first battery packs in series with the electric motor. A plurality of indicators is configured to communicate information concerning the respective conditions of the plurality of attached first battery packs. The plurality of indicators is arranged such that all of the indicators are simultaneously viewable by a user of the electric power tool.
551 citations
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TL;DR: In this article, a combined heat and power dispatch (CHPD) is formulated to coordinate the operation of electric power system (EPS) and district heating system (DHS), which is solved by an iterative method.
Abstract: The regional integration of variable wind power could be restricted by a strong coupling of electric power generation dispatch and heat supply of combined heat-and-power (CHP) units. The coupling in cold seasons precludes CHPs from providing the necessary flexibility for managing the wind power dispatch. The lack of flexibility problem can be tackled by exploiting the energy storage capability of a district heating network (DHN) which decouples the strong linkage of electric power and heat supplies. In this paper, a combined heat and power dispatch (CHPD) is formulated to coordinate the operation of electric power system (EPS) and district heating system (DHS). The proposed CHPD model which is solved by an iterative method considers the temperature dynamics of DHN for exploiting energy storage as an option for managing the variability of wind energy. The simulation results are discussed for several test systems to demonstrate the potential benefits of the proposed method in terms of operation economics, wind power utilization, as well as the potential benefits for real systems.
544 citations
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TL;DR: In this article, a 6.6-kV battery energy storage system based on a cascade PWM converter with focus on a control method for state-of-charge (SOC) balancing of the battery units is described.
Abstract: Renewable energy sources such as wind turbine generators and photovoltaics produce fluctuating electric power. The fluctuating power can be compensated by installing an energy storage system in the vicinity of these sources. This paper describes a 6.6-kV battery energy storage system based on a cascade pulsewidth-modulation (PWM) converter with focus on a control method for state-of-charge (SOC) balancing of the battery units. A 200-V, 10-kW, 3.6-kWh (13-MJ) laboratory system combining a cascade PWM converter with nine nickel metal hydride (NiMH) battery units is designed, constructed, and tested to verify the validity and effectiveness of the proposed balancing control.
533 citations
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TL;DR: A comparative evaluation of the different de-icing techniques, already developed and in development, which could be applied to the conductors and wires of electric power lines, based on energy efficiency and practicability suggests to favor the mechanical techniques over thermal methods that have been developed, but require more energy.
527 citations
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22 Nov 2006
TL;DR: The Power Electronics Handbook, 3rd edition as mentioned in this paper contains 45 chapters covering all aspects of power electronics and its applications, including switching devices, converter circuit topologies, control techniques, analytical methods and some examples of their applications.
Abstract: Power electronics, which is a rapidly growing area in terms of research and applications, uses modern electronics technology to convert electric power from one form to another, such as ac-dc, dc-dc, dc-ac, and ac-ac with a variable output magnitude and frequency. It has many applications in our every day life such as air-conditioners, electric cars, sub-way trains, motor drives, renewable energy sources and power supplies for computers. This book covers all aspects of switching devices, converter circuit topologies, control techniques, analytical methods and some examples of their applications. Designed to appeal to a new generation of engineering professionals, "Power Electronics Handbook, 3rd Edition" features four new chapters covering renewable energy, energy transmission, energy storage, as well as an introduction to Distributed and Cogeneration (DCG) technology, including gas turbines, gensets, microturbines, wind turbines, variable speed generators, photovoltaics and fuel cells, has been gaining momentum for quite some time now. With this book readers should be able to provide technical design leadership on assigned power electronics design projects and lead the design from the concept to production involving significant scope and complexity. It contains 45 chapters covering all aspects of power electronics and its applications. It features three new chapters now including coverage Energy Sources, Energy Storage and Electric Power Transmission. It includes contributions from more than fifty leading experts spanning twelve different countries.
525 citations