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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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TL;DR: This article focuses on problems and issues related to PQ and power system diagnostics, in particular those where signal processing techniques are extremely important.
Abstract: This article focuses on problems and issues related to PQ and power system diagnostics, in particular those where signal processing techniques are extremely important. PQ is a general term that describes the quality of voltage and current waveforms. PQ problems include all electric power problems or disturbances in the supply system that prevent end-user equipment from operating properly.
110 citations
TL;DR: Zenergy Power has been developing an inductive type of fault current limiter (FCL) for electric power grid applications as mentioned in this paper, which employs a magnetically saturating reactor concept which acts as a variable inductor in an electric circuit.
Abstract: Zenergy Power has been developing an inductive-type of fault current limiter (FCL) for electric power grid applications. The FCL employs a magnetically saturating reactor concept which acts as a variable inductor in an electric circuit. In March 2009 Zenergy Power, with funding from the California Energy Commission and the U.S. Department of Energy (DOE), installed an FCL in the Avanti distribution circuit of Southern California Edison's Shandin substation in San Bernardino, CA. Rated at 15 kV and 1,250 amperes steady-state, the “Avanti” device is the first superconductor FCL installed in a US utility. In January 2010, the “Avanti” device successfully limited its first series of real-world faults when the circuit experienced multiple single-phase and three-phase faults. After successfully validating the performance of a new “compact” saturated-core FCL, Zenergy Power received contracts to install a 12 kV, 1,250 amperes compact FCL in the CE Electric UK grid in early 2011 and a 138 kV, 1,300 amperes FCL at the Tidd substation of American Electric Power in late 2011.
110 citations
TL;DR: In this article, the authors present a summary of guidelines for modeling power electronics in various power engineering applications, which are designed for use by power engineers who need to simulate power electronic devices and sub-systems with digital computer programs.
Abstract: This paper presents a summary of guidelines for modeling power electronics in various power engineering applications. This document is designed for use by power engineers who need to simulate power electronic devices and sub-systems with digital computer programs. The guideline emphasizes the basic issues that are critical for successfully modeling power electronics devices and the interface between power electronics and the utility or industrial system. The modeling considerations addressed in this guideline are generic for all power electronics modeling independent of the computational tool. However, for the purposes of illustration, the simulation examples presented are based on the EMTP or EMTP type of programs. The procedures used to implement power electronics models in these examples are valuable for using other digital simulation tools.
110 citations
Patent•
01 Oct 1990
TL;DR: In this article, a reservoir of carbon dioxide at about its triple point is created in an insulated vessel to store energy in the form of refrigeration recovered from the evaporated LNG.
Abstract: LNG (9) is pumped to high pressure (13) vaporized (19), further heated (21) and then expanded to create rotary power (29) that is used to generate electrical power (31). A reservoir of carbon dioxide at about its triple point (41) is created in an insulated vessel to store energy in the form of refrigeration recovered from the evaporated LNG. During peak electrical power periods, liquid carbon dioxide is withdrawn therefrom, pumped to a high pressure (45), vaporized (47, 75) further heated (55), and expanded to create rotary power (57) which generates additional electrical power (59). The exhaust from a fuel-fired combustion turbine (61), connected to an electrical power generator (63), heats the high pressure carbon dioxide vapor. The discharge stream from the CO2 expander is cooled (53) and at least partially returned to the vessel (41) where vapor condenses by melting stored solid carbon dioxide. During off-peak periods, CO2 vapor is withdrawn from the reservoir and condensed to liquid by vaporizing LNG, so that use is always efficiently made of the available refrigeration from the vaporizing LNG, and valuable peak electrical power is available when needed by using the stored energy in the CO2 reservoir (41).
110 citations
TL;DR: In this article, the authors proposed two methods of using HVAC systems for providing frequency regulation (FR) services to the electric grid by adjusting the power consumption in response to a signal sent by the power grid operator.
110 citations