Showing papers in "IEEE Transactions on Energy Conversion in 2002"
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TL;DR: In this article, a microprocessor-controlled tracker capable of online voltage and current measurements and programmed with both voltage-based and current-based MPPT algorithms is constructed, where the load of the solar system is either a water pump or a resistance.
Abstract: Detailed theoretical and experimental analyses are presented for the comparison of two simple fast and reliable maximum power point tracking (MPPT) techniques for photovoltaic systems (PV): the voltage-based (VMPPT) and the current-based (CMPPT) approaches. A microprocessor-controlled tracker capable of online voltage and current measurements and programmed with both VMPPT and CMPPT algorithms is constructed. The load of the solar system is either a water pump or a resistance. Simulink facilities are used for simulation and modeling of the novel trackers. The main advantage of this new MPPT, as compared with present trackers, is the elimination of reference (dummy) cells, which results in a more efficient, less expensive, and more reliable PV system.
761 citations
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TL;DR: In this article, two market dependent optimization algorithms that can be used to plan wind energy conversion system (WVECS) installations simultaneously over several sites of interest to a utility, within the scope of available WECS models, power demand of the utility, and wind characteristics at each site; both being variable with time and subject to seasonal changes.
Abstract: This paper presents two market dependent optimization algorithms that can be used to plan wind energy conversion system (WVECS) installations simultaneously over several sites of interest to a utility, within the scope of (a) available WECS models, (b) power demand of the utility, and (c) wind characteristics at each site; both (b) and (c) being variable with time and subject to seasonal changes. A suitable case study illustrates application of the planning algorithms to a scenario comprising of eight installation sites, using a representative market database consisting of thirty-seven available models ofWECS.
87 citations
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TL;DR: In this paper, four analytical methods for determining the intermediate-axis saturation characteristics of salient-pole synchronous machines from the measured d-axis saturations were presented, and the accuracies of these four methods have been verified by comparing the measured field currents and load angles of two laboratory SPSs of different designs with those calculated using an innovated approach which directly in the modeling of the saturated synchronous machine.
Abstract: In the analysis of the steady-state performances of saturated synchronous machines using the classical two-axis (d- and q-axis) frame model, the accurate calculation of the machine performances depends to a large extent on their saturation conditions. However, the effect of saturation depends not only on the saturation level in the axis of the resultant machine ampere-turns (intermediate-axis) but also on the phase angle between the resultant ampere-turns and the resultant magnetic flux. This work presents four analytical methods for determining the intermediate-axis saturation characteristics of salient-pole synchronous machines from the measured d-axis saturation characteristics. The accuracies of these four methods have been verified by comparing the measured field currents and load angles of two laboratory salient-pole synchronous machines of different designs with those calculated using an innovated approach which uses the intermediate-axis saturation characteristics directly in the modeling of the saturated synchronous machines. Moreover, the calculated intermediate-axis saturation characteristics have been compared with the measurable ones in the case of one of these machines.
34 citations
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18 citations
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TL;DR: Perahia as discussed by the authors discusses the case of a two stator three phase squirrel cage induction machine where one stator housing is stationary and the other is mounted on a worm gear assembly.
Abstract: J. Perahia comments on the paper by J. S. Hsu (see ibid., vol.16, p.192-7, 2001) and expands on the case of a two stator three phase squirrel cage induction machine where one stator housing is stationary and other stator housing is mounted on a worm gear assembly. The original author replies to the comments.
1 citations