a.ong va.ious photovolta.c (PV) ma.imum power point tra.king (MPPT) techniques, va.ia.le-step incrementa. conducta.ce (***.) method is widely employed with the merits of high tra.king a.cura.y a.d fa.t convergence spe...
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ISBN:
(纸本)9781479902255
a.ong va.ious photovolta.c (PV) ma.imum power point tra.king (MPPT) techniques, va.ia.le-step incrementa. conducta.ce (***.) method is widely employed with the merits of high tra.king a.cura.y a.d fa.t convergence speed. Yet, ma.hema.ica. division computa.ions a.e ma.da.ory for the a.gorithm's structure which in turn a.ds more complexity to its implementa.ion. Moreover, conventiona. va.ia.le step, depending on the cha.ge of the a.ra. power with respect to the a.ra. volta.e, encounters stea.y-sta.e oscilla.ions a.d dyna.ic problems especia.ly under sudden irra.ia.ce cha.ges. This pa.er proposes a.modified va.ia.le-step ***. MPPT technique fea.uring division-free a.gorithm, simplified implementa.ion, a.d enha.ced tra.sient performa.ce with minima. stea.y-sta.e power oscilla.ions a.ound the MPP. Simula.ion a.d experimenta. results a.e presented for concept rea.iza.ion a.d performa.ce eva.ua.ion.
The dependency of photovolta.c (PV) a.ra.s on tempera.ure a.d irra.ia.ce levels sha.es their known nonlinea. beha.ior;hence ma.imum power point tra.king (MPPT) is ma.da.ory. Tra.itiona. MPPT techniques, like Perturb a...
ISBN:
(纸本)9781467324212
The dependency of photovolta.c (PV) a.ra.s on tempera.ure a.d irra.ia.ce levels sha.es their known nonlinea. beha.ior;hence ma.imum power point tra.king (MPPT) is ma.da.ory. Tra.itiona. MPPT techniques, like Perturb a.d Observe (P&O) a.d Incrementa. Conducta.ce (IncCond), offer a.cepta.le performa.ce with a.tra.e-off between a.cura.y a.d fa.t opera.ion. Moreover, modera.e opera.ion is rema.ked a. ra.idly cha.ging environmenta. conditions. On the contra.y, off-line tra.ned a.tificia. neura. network (a.N) is considered a.a.cura.e, fa.t a.d robust estima.ion technique. In this pa.er, a.two-sta.e off-line tra.ned a.N ba.ed MPPT technique is proposed where two ca.ca.ed a.Ns a.e utilized. The first estima.es the tempera.ure a.d irra.ia.ce levels from the a.ra. volta.e a.d current signa.s while the other network determines the optimum pea. opera.ing point from the tempera.ure a.d irra.ia.ce, estima.ed by the first a.N. The proposed technique offers enha.ced performa.ce even under ra.idly cha.ging environmenta. conditions, no need for tempera.ure/irra.ia.ce mea.urement, in a.dition to reduced required tra.ning sets beca.se of the presented a.N ca.ca.ed structure.
This pa.er presents a.a.t Colony Optimiza.ion a.proa.h (a.O) to solve the shortest pa.h problem, especia.ly with fuzzy constra.nts. The proposed a.gorithm consists of five sequentia. steps. The first step is to deter...
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ISBN:
(纸本)9781424458288;9789774033964
This pa.er presents a.a.t Colony Optimiza.ion a.proa.h (a.O) to solve the shortest pa.h problem, especia.ly with fuzzy constra.nts. The proposed a.gorithm consists of five sequentia. steps. The first step is to determine the number of possible pa.hs from the source to the ta.get. The second step ca.cula.es the proba.ility of ea.h pa.h of possible pa.hs. The third step ca.cula.es the expected number of a.ts through ea.h pa.h of possible pa.hs then ca.cula.es in the fourth step the new tra.l of ea.h weight component for ea.h pa.h of possible pa.hs, which lea.s to the fina. step to ca.cula.e the a.era.e tra.l of ea.h pa.h. The shortest pa.h Problem (SPP) is a. NP-ha.d combina.oria. optimiza.ion problem tha. ha. long cha.lenged resea.chers. The objective of the SPP is to find the pa.h between two nodes with shortest length (weight). Some problems from references a.e solved using the proposed a.gorithm a.d a. implementa.ion study is presented. The implementa.ion study shows the efficiency of the proposed a.gorithm.
This pa.er presents a.a.t Colony Optimiza.ion a.proa.h (a.O) to solve the shortest pa.h problem, especia.ly with fuzzy constra.nts. The proposed a.gorithm consists of five sequentia. steps. The first step is to deter...
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ISBN:
(纸本)9789774033964
This pa.er presents a.a.t Colony Optimiza.ion a.proa.h (a.O) to solve the shortest pa.h problem, especia.ly with fuzzy constra.nts. The proposed a.gorithm consists of five sequentia. steps. The first step is to determine the number of possible pa.hs from the source to the ta.get. The second step ca.cula.es the proba.ility of ea.h pa.h of possible pa.hs. The third step ca.cula.es the expected number of a.ts through ea.h pa.h of possible pa.hs then ca.cula.es in the fourth step the new tra.l of ea.h weight component for ea.h pa.h of possible pa.hs, which lea.s to the fina. step to ca.cula.e the a.era.e tra.l of ea.h pa.h .The shortest pa.h Problem (SPP) is a. NP-ha.d combina.oria. optimiza.ion problem tha. ha. long cha.lenged resea.chers. The objective of the SPP is to find the pa.h between two nodes with shortest length (weight). Some problems from references a.e solved using the proposed a.gorithm a.d a. implementa.ion study is presented. The implementa.ion study shows the efficiency of the proposed a.gorithm.
This pa.er presents a.fuzzy logic controlled shunt a.tive power filter used to compensa.e for ha.monic distortion in three-pha.e four-wire systems. The shunt a.tive filter employs a.simple method for the ca.cula.ion o...
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This pa.er presents a.fuzzy logic controlled shunt a.tive power filter used to compensa.e for ha.monic distortion in three-pha.e four-wire systems. The shunt a.tive filter employs a.simple method for the ca.cula.ion of the reference compensa.ion current ba.ed of Fa.t Fourier Tra.sform. This presented filter is a.le to opera.e in both ba.a.ced a.d unba.a.ced loa. conditions. a.fuzzy logic ba.ed current controller stra.egy is used to regula.e the filter current a.d hence ensure ha.monic free supply current. The va.idity of the presented a.proa.h in ha.monic mitiga.ion is verified via.simula.ion results of the proposed test system under different loa.ing conditions.
To compa.e a.d test some loca.iza.ion methods a.generic vehicle mobile pla.form wa. designed. To build the pla.form, a.mecha.ica. ba.e of a.vehicle model wa. used, which wa. reduced to 1/8 a.d to which a. embedded com...
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ISBN:
(纸本)0780384822
To compa.e a.d test some loca.iza.ion methods a.generic vehicle mobile pla.form wa. designed. To build the pla.form, a.mecha.ica. ba.e of a.vehicle model wa. used, which wa. reduced to 1/8 a.d to which a. embedded computer, a.wireless da.a.tra.smission module a.d some sensors were a.ded. The pla.form ha. to dea. with severa. specificities like to be controlled by a.dista.t opera.or, to give a.d estima.ion of the loca.iza.ion on a. environment ma.a.d to provide a.visua. return to the user.
Development of a.powerful loca.iza.ion system ha. suggested number of works. Loca.iza.ion is a.wa.s done in a.two pha.es process: prediction a.d estima.ion. Prediction (which integra.es the odometric da.a. is quite si...
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Development of a.powerful loca.iza.ion system ha. suggested number of works. Loca.iza.ion is a.wa.s done in a.two pha.es process: prediction a.d estima.ion. Prediction (which integra.es the odometric da.a. is quite simila. wha.ever the method is. But, the estima.ion could be done in very different wa.s. Thus, we sa. the emerging of severa. technics using proba.ilistic, interva.a.a.ysis a.d Ma.kovia. methods. Depending on the chosen method, the loca.iza.ion ca. be performed in complex, dyna.ic or ba.ly ma.ped environments. So a. to compa.e a.d test some loca.iza.ion methods (which where never been used in rea. environment), we decided to design a.generic mobile pla.form. This pla.form ha. to dea. with severa. specificities like to be controlled by a.dista.t opera.or, to give a. estima.ion of the loca.iza.ion on a. environment ma.a.d to provide a.visua. return to the user.
a.ra.e ca.e of na.opha.yngea. tera.oma.(epigna.hus) is described in a.newborn fema.e, presenting with life threa.ening respira.ory emba.ra.sment. Complete excision wa.a.hieved. The ma.a.ement a.d differentia. dia.nos...
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