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The reactive power demand of the induction generator is significantly increased when the generator runs close to the rated operating point. The losses are increased due to the increased reactive power flow. Due to the limitation of converter ratings in the doubly fed induction generator (DFIG) system, power clipping may occur at turbine-rated conditions. In this paper, an optimum strategy for reactive...
This paper introduces an improved strategy to increase the power production of wind turbines equipped with doubly fed induction generators (DFIGs) at low wind speed operation. The performance of DFIG-based wind turbines at low wind speeds, close to the cut in speed, is investigated. A modified control to extend the concept of maximum wind power tracking to cover the low wind speed region is implemented...
This paper introduces a methodology to enhance the quality of the voltage and power produced from fixed-speed direct-connected wind turbines. The method uses an electrolyzer/fuel cell combination to be connected to the point of common coupling via limited rating converters. The control scheme is designed to keep the power ramp rate and voltage fluctuation within their limits and to minimize the rating...
This paper focus in modeling and simulation of Photovoltaic/Wind Hybrid Electric Power System interconnected to the electrical utility, PV/Wind HEPS, taking into account all radiation, temperature, wind speeds and variation of the load demand during the day. A computer simulation program has been designed to simulate all quantities of HEPS such as phase voltage of the inverter leg and current in each...
Keeping the generators operating during transient grid faults becomes an obligation for the bulk wind generation units connected to the transmission network and it is highly desired for distribution wind generators. A proposed scheme is implemented to keep the wind-power DFIG operating during transient grid faults. Challenges imposed on the generator configuration and the control during the fault...
Withstanding grid faults becomes an obligation for the bulk wind generation units connected to the transmission network and it is highly desired for distribution wind generators. In this paper, a proposed scheme is implemented for DFIG to keep it operating during transient grid faults. Challenges imposed on the generator configuration and the control during the fault and recovering periods are presented...
This paper is aimed at determining the sequence impedances of transmission lines, including the negative-, positive-, and zero-sequence impedance for single- and double-circuit lines. There are several methods used to determine the sequence impedances such as Carson, later modified by others, and Rudenberg. A comparative study is made between Carson and Rudenberg methods in their prediction of sequence...
This paper is dealt with one of vital important subjects to the designer and the operator of Distribution systems (DS). Its reliability has been estimated under several conditions of relay and transformers types and DS configurations. The results obtained enable the designer to determine the choice of these factors in view of the sensitivity of DS reliability to their failure characteristics. A computer...
It is known that the protection system is one of the important parts of the power system. So one can say that it is the most important one. The protection system can be accepted if and only if it is efficient one and realize some requirements. The protection system must have high reliability, high selectivity, high speed and low cost. During the calculation of operation setting for different protection...
The generated power from Photovoltaic Power System, PVPS have been calculated by a computer program under known insolation and temperature. The computer program, which proposed here and applied to make optimal design of PVPS, is based on the minimization of the energy purchase from grid. This paper presents a complete study from economic and reliability point of view to determine the impact of interconnecting...
The performance of photovoltaic power system interconnected with utility grid can be improved through an application of advanced control method. This paper introduces an application of an artificial neural network on the operation control of the photovoltaic/utility grid to improve system efficiency and reliability. The generated power from photovoltaic solar cells array has been calculated by a computer...
The performance of photovoltaic power system interconnected with utility grid can be improved through an application of advanced control method. This paper introduces an application of an artificial neural network on the operation control of the photovoltaic/utility grid to improve system efficiency and reliability. The generated power from photovoltaic solar cells array have been calculated by a...
Since the solar array is the most expensive component of a photovoltaic system, appropriate sizing for a particular application should be a major concern of the designer. The principal objective of this research is to explore the effect of the load profile on the sizing process of the solar cells array (SCA), and as a function of time. It is possible to quantify and determine the load classes that...
This paper presents a proposed novel technique in which an accurate optimum design of the solar array (SCA) can be attained. It depends on an hour-by-hour approach with different daily load profiles. A generalized mathematical formula has been developed for, sizing of the solar array given the geographical and one year's insolation data for a particular site in EGYPT. This approach can reduce the...
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