The California generation fleet manages the existing variability and uncertainty in the demand for electric power (load). When wind power is added, the dispatchable generators manage the variability and uncertainty of the net load (load minus wind power). The variability and uncertainty of the load and the net load are compared when 8790MW of wind power are added to the California power system,...

Lunar swirls are delicate light-coloured markings on the Moon’s surface. The lighter soil is unweathered, having been somehow shielded from the solar wind. Although lunar swirls are known to be associated with anomalous magnetic fields, their exact origin has remained mysterious — however, Ruth Bamford and colleagues have now tied together satellite data, laboratory experiments and a theoretica...

The hybrid wind–hydro power generation appears to be an attractive solution for isolated, autonomous electric grids in order to increase the wind energy penetration and cost-effectiveness. This work presents a numerical methodology for optimum sizing of the various components of a reversible hydraulic system designed to recover the electric energy that is rejected from wind farms due to imposed...

The solar wind plasma from the Sun interacts with the Moon, generating a wake structure behind it, since the Moon is to a good approximation an insulator, has no intrinsic magnetic field and a very thin atmosphere. The lunar wake in simplified geometry has been simulated via a 1 1 2 D electromagnetic particle-in-cell code, with high resolution in order to resolve the full phase space dynamics o...

The effect of viscosity and of converging flows on the formation of blobs in the slow solar wind is analysed by means of resistive MHD simulations. The regions above coronal streamers where blobs are formed (Sheeley et al., 1997) are simulated using a model previously proposed by Einaudi et al. (1999). The result of our investigation is twofold. First, we demonstrate a new mechanism for enhance...

Wind generation with an uncertain nature poses many challenges in grid integration and secure operation of power system. One of these operation problems is the unit commitment. Demand Response (DR) can be defined as the changes in electric usage by end-use customers from their normal consumption patterns in response to the changes in the price of electricity over time. Further, DR can be also d...

With wider deployment of the plug-in electric vehicle (PEV), a power distribution network operator (DNO) would expect increasing domestic demand due to large numbers of vehicles charging. This could lead potentially to overloading of power system assets unless appropriate demand side management is in place. The UK coalition government has made a commitment to increase the amount of renewable ge...

The first step in the design of hybrid power generation system (HPGS) is the feasibility study. This paper discusses the feasibility analysis of a hybrid power generation system at Kallar Kahar Pakistan. The feasibility study mainly focuses on the technical and economic analysis of the components of hybrid power generation system for the selected site. The hybrid power generation system is base...

The physical description in itself can be based on the kind of coupling being involved (i.e., thermal, gravitational, electromagnetic, or by matter exchange). Gravitational coupling is related to celestial mechanics and tidal deformation. Thermal coupling is ultimately concerned with energy balance. Matter exchange is concerned with the interaction between contiguous systems, and particularly i...