Export 127 results:
Sort by: Author [ Title  (Asc)] Type Year
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 
fatma elzahraa magdy, D. K. Ibrahim, and W. Sabry, "Virtual power plants novel electro-economical modeling approach", Cigre Egypt 2019, The Future of Electricity Grids: Challenges and Opportunities, Egypt, 6-8 March 2019. Abstract

From about fifteen years passed, a new term was proposed for the first time by Dielmann and Velden: "Virtual Power Plant (VPP)", and they asked about if the VPPs can contribute as a reliable and environmentally oriented energy supply, or not?, at this moment, they considered some problems that must be examined to insure the success of this idea; like: management of such a system (optimal utilization), adaptation of VPP with the network connected to (reliability), markets (retail and wholesale) … etc. If these problems are solved, then the VPP has a large opportunity to deliver an important contribution as an economic, reliable and nonpolluting energy supply system. The market is the dominant factor for the success of VPPs being. Before the age of distributed generation (DG), the energy delivery pricing model was the cost against service. The model states that consume (buy) energy then pay -buy and pay-. When the age of renewables raised up, the model of buy and pay is shifted away to a new market based pricing model: pay at first and then buy. Another conceptual model starts to appear including active demand side participation using the transactive energy concept. In this paper, a new combined model for market and electrical performance of VPPs is presented; the electro-economical model (EEM). The model will include the four basic components of any VPP: dispatchable power plants, flexible loads, storage units, and stochastic generating units. Two main targets for the proposed modeling: optimal operation of VPPs, and active network energy management of VPPs. The VPP can earn profit from the market and as a result, its objective reduces to maximizing its profit (ρ). Energy management in a VPP or active network management means the optimal operation of this VPP in order to manage energy flow. Optimal operation is based on a stochastic basis of energy sources and multi-market framework.

Din, E. S. T. E., M. Gilany, M. M. Abdel Aziz, and D. K. Ibrahim, "A wavelet-based fault location technique for aged power cables", Power Engineering Society General Meeting, 2005. IEEE: IEEE, pp. 2485-2491, 2005. Abstract

A novel Wavelet-based Travelling Wave cable fault locator scheme is presented in this paper. Using the theory of wavelet singularity detection as a powerful signal processing tool, the initial arrival of the voltage travelling waves at both sides of the power cable and the second arrival of the travelling waves at the first side can be identified reliably without the need for detection the sign of these waves. The developed wavelet
processing is applied on the modal coordinated instead of the phase coordinates. The proposed scheme has the ability to eliminate the effect of the change in the propagation velocity of the travelling waves. This will help solving the problem of cable changing parameters especially the changing of the relative permittivity of the cable over its age. Cable changing parameters causes a large error in all fault location techniques, which use the value of velocity of propagation in calculations. Characteristics of the proposed protection algorithm are analyzed by extensive simulation studies using ATP/EMTP. The obtained results
indicate an accepted degree of accuracy for the suggested fault locator. In addition, the results prove that the proposed wavelet based scheme solves the problem of aging cables with changing parameters over the age of the power cable.