Showing papers by "Yahia Baghzouz published in 2000"
16 Jul 2000
TL;DR: In this paper, the characteristics of a pure residential load through field tests were investigated and it was found that the load real and reactive powers can be respectively approximated by a linear and a quadratic function of voltage.
Abstract: This article investigates the characteristics of a pure residential load through field tests. Staged voltage perturbations by station transformer tap-changing are induced both with and without switching ON the feeder shunt capacitors. Sudden voltage deviations by capacitor switching are attempted. Static load parameters are derived from the recorded load response to voltage variations. It is found that the load real and reactive powers can be respectively approximated by a linear and a quadratic function of voltage.
19 citations
24 Jul 2000
TL;DR: In this paper, the effect of on/off algorithms on the system performance is analyzed and a simple analytical model of a multi-step charge controller is presented and illustrated by an example.
Abstract: Most battery charge controllers in stand-alone photovoltaic power systems shed portions of the PV array in discrete steps as the battery voltage approaches full charge. This paper analyzes the effect of such on/off algorithms on the system performance. A simple analytical model of a multi-step charge controller is presented and illustrated by an example. Computer simulations and field measurements of an actual system show that on/off chargers limit the use of PV energy hence resulting in lower performance than conventional models.
14 citations
24 Jul 2000
TL;DR: In this article, a program to modify a hydrogen hybrid electric bus is described, which is an electric bus that uses a hydrogen-fueled internal combustion engine to charge on-board batteries.
Abstract: A program to modify a hydrogen hybrid electric bus is described. This is an electric bus that uses a hydrogen-fueled internal combustion engine to charge on-board batteries. The primary goal of the reported work is to extend the range of the bus in a cost-effective manner. Among the modifications being made are the development of a new engine, upgrading the power control system, rewiring critical elements, adapting a supercapacitor regenerative braking system, devising more effective changes to the hydrogen safety systems, and adding a high pressure gas storage system to supplement the existing hydride bed hydrogen storage. All of this work is being supplemented with the use of a dynamic simulation code to determine optimal operational strategies.
7 citations
01 Oct 2000
TL;DR: In this paper, the effect of slot harmonics on the DC-side voltage of a generator-rectifier set was investigated and the average voltage and ripple factor were derived in terms of the generator voltage harmonic magnitudes and their phase relation with respect to the fundamental component.
Abstract: This paper investigates the effect of slot-harmonics on the DC-side voltage of a generator-rectifier set. The average voltage and ripple factor of the rectified waveform are derived in terms of the generator voltage harmonic magnitudes and their phase relation with respect to the fundamental component. The analysis is illustrated by a numerical example and a laboratory test on an actual auxiliary power unit of a hybrid-electric transit vehicle. It is found that while slot harmonics have a negligible impact on the average voltage, the increase in ripple factor can be significant.
2 citations
TL;DR: Baghzouz as mentioned in this paper comments on the paper by E.Y. Davies et al. (see ibid., vol.15, no.1, p.19-23, 2000).
Abstract: Y. Baghzouz comments on the paper by E. J. Davies et al. (see ibid., vol.15, no.1, p.19-23, 2000). The original authors reply to the comments.
1 citations