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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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Patent
29 Nov 1977
TL;DR: In this paper, an induction generator is connected to the public mains supply, eliminating the need to store power, without sophisticated interface arrangements, and a second generator connected to a resistive space or water heating load can be cut in at higher energy levels.
Abstract: Electric power is generated from a non-uniformly operating energy source such as wind or water waves by driving hydraulic pump means by a wind wheel or a bobbing float The pump feeds hydraulic medium into a cylinder to raise a piston loaded by a weight When the weight rises above a predetermined level, the medium is fed under its constant pressure to drive an hydraulic motor connected to an induction generator Because the generator is driven at constant power (though intermittently) it can be connected to the public mains supply, eliminating the need to store power, without sophisticated interface arrangements A second generator connected to a resistive space or water heating load can be cut in at higher energy levels The hydraulic pump can be arranged to extract power from the source in the most efficient way

343 citations

Patent
16 Jun 1997
TL;DR: In this article, an apparatus for supplying regulated voltage d.c. electrical power to an LED array (12) includes a rectifier (32) responsive to a.c power failure and a power factor correcting and voltage regulating buck/boost switchmode converter (38).
Abstract: An apparatus (10) for supplying regulated voltage d.c. electrical power to an LED array (12) includes a rectifier (32) responsive to a.c power for generating rectified d.c. power and a power factor correcting and voltage regulating buck/boost switchmode converter (38) responsive to the rectified d.c. power for generating regulated voltage d.c. power to illuminate the LED array (12). A battery backup system (62) receives the a.c. power applied to the rectifier (32) for charging a rechargeable battery (66) and sensing an a.c. power failure. A switch-over relay (82) is connected between the battery backup system (62) and the rectifier. Upon sensing a failure of the a.c. power, the battery backup system (62) controls the switch-over relay (82) to connect the battery backup system (62) to the rectifier (32) to provide d.c. power to the switchmode converter (38) to illuminate the LED array (12). A half wave power detector (88) causes the apparatus (10) to reduce regulated d.c. power to dim the LED array (12).

343 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a detailed technical overview of microgrid and smart grid in light of present development and future trend, including existing technical challenges, communication features, policies and regulation, etc.
Abstract: The modern electric power systems are going through a revolutionary change because of increasing demand of electric power worldwide, developing political pressure and public awareness of reducing carbon emission, incorporating large scale renewable power penetration, and blending information and communication technologies with power system operation. These issues initiated in establishing microgrid concept which has gone through major development and changes in last decade, and recently got a boost in its growth after being blessed by smart grid technologies. The objective of this paper is to presents a detailed technical overview of microgrid and smart grid in light of present development and future trend. First, it discusses microgrid architecture and functions. Then, smart features are added to the microgrid to demonstrate the recent architecture of smart grid. Finally, existing technical challenges, communication features, policies and regulation, etc. are discussed from where the future smart grid architecture can be visualized.

343 citations

Journal ArticleDOI
TL;DR: In this paper, the authors argue that a new electric power production industry is emerging, and that it will rely on a broad array of new technologies, such as internal combustion engine generators, fuel cells and microturbines.
Abstract: As the electric utility industry continues to restructure, driven both by rapidly evolving regulatory environments and by market forces, the emergence of a number of new generation technologies also profoundly influences the industry's outlook. While it is certainly true that government public policies and regulations have played a major role in the rapidly growing rate at which distributed generation is penetrating the market, it is also the case that a number of technologies have reached a development stage allowing for large-scale implementation within existing electric utility systems. At the onset of any discussion related to distributed generation, one question begs to be answered: is the fact that electric power producing facilities are distributed actually a new and revolutionary concept? Have power plants not always been located across broad expanses of land? The answer to these questions clearly is that electric power plants have always been sited all across the service territories of the utilities owning them. Hence, the opening question: as with many so-called innovations that have been put forward during the recent past, is the entire concept of distributed generation a simple semantic marketing hype or are we actually at the dawn of a new electric power generation era? We believe that a new electric power production industry is emerging, and that it will rely on a broad array of new technologies. This article sets the stage for distributed generation covering such topics as: the present power production situation; what distributed generation is; capability ratings and system interfaces; market penetration of internal combustion engine generators, fuel cells and microturbines; potential generation mix issues, network considerations including power quality, reactive power coordination, reliability and reserve margin, reliability, network redundancy, safety and accountability; public policy and regulatory impact; and standards.

342 citations

Book
01 Jan 1998
TL;DR: In this article, the authors present a framework and methods for the analysis of bilateral transmission and propose a new control paradigm for deregulating the electric power market, based on agent-based economics.
Abstract: Preface. 1. Setting the Stage L. Hyman. Part I: Theoretical Challenges in Real-Time Operation. 2. Power Systems Operation: Old vs. New M. Ilic, F. Galiana. 3. Framework and Methods for the Analysis of Bilateral Transmissions F. Galiana, M. Ilic. Part II: Industry Experiences and Challenges. 4. The Political Economy of the Pool R. Green. 5. Practical Requirements for ISO Systems R. Masiello. Part III: Markets of the Future. 6. Agent Based Economics G. Sheble. 7. One-Part Markets for Electric Power: Ensuring the Benefits of Competition F.C. Graves, et al. Part IV: Planning in the New Industry. 8. System Planning under Competition R. Coxe, M. Ilic. 9. Transmission Networks and Market Power Z. Younes, M. Ilic. 10. Competitive Electric Services and Efficiency S.R. Connors. Part V: Power Systems Control in the New Industry. 11. New Control Paradigms for Deregulation L.H. Fink. 12. The Control and Operation of Distributed Generation in a Competitive Electric Market J. Cardell, M. Ilic. 13. Application of Dynamic Generation Control for Predatory Competitive Advantage in Electric Power Markets T. Gorski, C. DeMarco. Index.

340 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023267
2022678
20211,512
20202,845
20193,476