Electric power

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

Optimal Scheduling for Prosumers in Coupled Transactive Power and Gas Systems

Abstract: To help the integration of various distributed energy resources (DERs), this paper proposes a transactive approach to the optimal scheduling for prosumers in coupled energy systems. DERs are coordinately operated in the form of a virtual power plant (VPP), which actively participates in the day-ahead and real-time electricity market, as well as the wholesale gas market. In the day-ahead electricity and wholesale gas markets, a VPP aims to maximize expected profits by determining the unit commitments and hourly scheduling of DERs. In the real-time balancing market, a VPP adjusts DER schedules to minimize imbalance costs. In this paper, we address the energy conversions between electric power and gas loads and investigate the interacting operations of gas and power systems. Our simulation results show that hierarchical, coordinated power and gas scheduling can identify more accurate operation plans for coupled transactive energy systems.

Subdermal Flexible Solar Cell Arrays for Powering Medical Electronic Implants.

Abstract: A subdermally implantable flexible photovoltatic (IPV) device is proposed for supplying sustainable electric power to in vivo medical implants. Electric properties of the implanted IPV device are characterized in live animal models. Feasibility of this strategy is demonstrated by operating a flexible pacemaker with the subdermal IPV device which generates DC electric power of ≈647 μW under the skin.

Long-Run Equilibrium Modeling of Emissions Allowance Allocation Systems in Electric Power Markets

Abstract: Carbon dioxide allowance trading systems for electricity generators are in place in the European Union and in several U.S. states. An important question in the design of such systems is how allowances are to be initially allocated: by auction, by giving away fixed amounts (grandfathering), or by allocating based on present or recent output, investment, or other decisions. The latter system can bias investment, operations, and product pricing decisions and increase costs relative to the other systems. A nonlinear complementarity model is proposed for investigating the long-run equilibria that would result under alternative systems for power markets characterized by time-varying demand and multiple technology types. Existence of equilibria is shown under mild conditions. Solutions for simple systems show that allocating allowances to new capacity based on fuel use or generator type can yield large distortions in capacity investment, invert the operating order of power plants, and inflate consumer costs. The distortions can be smaller for tighter CO2 restrictions and are somewhat mitigated if there is also a market for electricity capacity or minimum-run restrictions on coal plants. Distortions are also less if allowances are allocated to plants in proportion to sales rather than capacity.

Power Electronics as an Enabling Technology for Renewable Energy Integration

Abstract: The global electrical energy consumption is still rising and there is a steady demand to increase the power capacity, to produce, distribute and use the energy as0 efficient as possible and furthermore to set up incentives to save energy at the end-user. Two major technologies will play important roles to fulfill those targets. One is to change the electrical power production sources from the conventional, fossil (and short term) based energy sources to renewable energy resources. The other is to use high efficiency power electronics in power systems for high efficiency and high performance applications. This paper discusses both areas, in particular the power electronic application m wind power integration

A new method of harmonic power detection based on the instantaneous active power in three-phase circuits

Abstract: This paper presents a new method of harmonic power detection based on the instantaneous active power in three-phase circuits, and its applications to search for dominant harmonic sources in power systems. The proposed method requires only band elimination filters and a three-phase active power meter to detect the harmonic active power, and it is able to deal with harmonic power flow more easily and precisely than a conventional meter which is based on Fourier series of single-phase circuits. In addition, measurement errors of the harmonic power are discussed theoretically. The validity of the proposed method is demonstrated by digital simulation. >