Electric power

About: Electric power is a research topic. Over the lifetime, 73036 publications have been published within this topic receiving 636991 citations.

Optimal response of an oligopolistic generating company to a competitive pool-based electric power market

Abstract: The target of an oligopolistic generating company in a pool-based electric power market is to maximize its profits using two related instruments at hand: (1) its ability to modify the market-clearing price; and (2) its capability to alter its own production level. Power balance is not an issue for the generating company; the independent system operator ensures power balance considering generator and demand bids through any market-clearing procedure. This paper proposes a mathematical model to determine the output of the generators owned by an oligopolistic generating company so that its profit is maximized for a one-day to one-week time horizon. An efficient solution technique to solve the resulting large-scale discontinuous nonlinear mixed-integer optimization problem is reported. A case study that illustrates the proposed model and the solution technique developed is analyzed in detail.

The state of the art of electric vehicles technology

Abstract: In a world where environment protection and energy conservation are growing concerns, the development of electric and hybrid vehicles (EV/HEV) has taken on an accelerated pace. The dream of having commercially viable electric/hybrid vehicles is becoming a reality. Electric and hybrid vehicles are gradually available in the market. This paper reviews the present status of electric and hybrid vehicles worldwide and their state of the art, with emphasis on the engineering philosophy and key technologies. The importance of the integration of technologies of automobile, electric motor drive, electronics, energy storage and controls, and the importance of the integration of society strength from government, industry, research institutions, electric power utilities and transportation authorities are addressed. The challenge of EV commercialization is discussed

Nested, hierarchical resource allocation schema for management and control of an electric power grid

Abstract: Disclosed herein are representative embodiments of methods, apparatus, and systems for distributing a resource (such as electricity) using a resource allocation system. In one exemplary embodiment, a system is disclosed comprising a first feeder network configured to deliver electrical power to a first plurality of customers. The first feeder network is controlled by a first market-based pricing system that computes a first feeder network price of electrical power at first periodic intervals. The system of this embodiment further comprises a second feeder network configured to deliver electrical power to a second plurality of customers. The second feeder network is controlled by a second market-based pricing system that computes a second feeder network price of electrical power at second periodic intervals. In this exemplary embodiment, the first feeder network and the second feeder network are part of a same distribution network, and the first feeder network price of electrical power is different than the second feeder network price of electrical power.

A Low-Frequency Versatile Wireless Power Transfer Technology for Biomedical Implants

Abstract: Implantable biomedical sensors and actuators are highly desired in modern medicine. In many cases, the implant's electrical power source profoundly determines its overall size and performance. The inductively coupled coil pair operating at the radio-frequency (RF) has been the primary method for wirelessly delivering electrical power to implants for the last three decades. Recent designs significantly improve the power delivery efficiency by optimizing the operating frequency, coil size and coil distance. However, RF radiation hazard and tissue absorption are the concerns in the RF wireless power transfer technology (RF-WPTT) [4], [5]. Also, it requires an accurate impedance matching network that is sensitive to operating environments between the receiving coil and the load for efficient power delivery. In this paper, a novel low-frequency wireless power transfer technology (LF-WPTT) using rotating rare-earth permanent magnets is demonstrated. The LF-WPTT is able to deliver 2.967 W power at ~ 180 Hz to an 117.1 Ω resistor over 1 cm distance with 50% overall efficiency. Because of the low operating frequency, RF radiation hazard and tissue absorption are largely avoided, and the power delivery efficiency from the receiving coil to the load is independent of the operating environment. Also, there is little power loss observed in the LF-WPTT when the receiving coil is enclosed by non-magnetic implant-grade stainless steel.