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A new direction in design and manufacture of co-sensitized dye solar cells : toward concurrent optimization of power conversion efficiency and durability

Hosseinnezhad M., Shadman A., Saeb M. R., Mohammadi Y.

Opto-Electronics Review

2017

Vol. 25, No. 3

229--237

A novel methodology was implemented in the present study to concurrently control power conversion efficiency (η) and durability (D) of co-sensitized dye solar cells. Applying response surface methodology (RSM) and Desirability Function (DF), the main influential assembling (dye volume ratio and anti-aggregation agent concentration) and operational (performance temperature) parameters were systematically changed to probe their main and interactive effects on the η and D responses. Individual optimization based on RSM elucidated that D can be solely controlled by changing the ratio of vat-based organic photosensitizers, whereas η takes both effects of dye volume ratio and anti-aggregation concentration into account. Among the studied factors, the performance temperature played the most vital role in η and D regulation. In particular, however, multi-objective optimization by DF explored the degree to which one should be careful about manipulation of assembling and operational parameters in the way maximization of performance of a co-sensitized dye solar cell.

A novel method to locate the voltage sag source: a case study in the Brazilian power network (Mato Grosso)

Moradi M. H., Mohammadi Y., Tayyebi M. H.

Przegląd Elektrotechniczny

2012

R. 88, nr 3b

112-115

This article presents a novel method to locate the voltage sag source based on directional overcurrent (DOC) relay information. In this method the source of voltage sag is located by using the variation of magnitude of measured current positive-sequence component during sag and presag conditions and the sign of its phase-angle jump. The performance of the proposed method is compared with distance relay (DR) and phase change in sequence current (PCSC) methods by using PSCAD/EMTDC on a simulated case study. The results show the good and unique performance of the novel method in cases where only currents are recorded.

W artykule zaprezentowano nową metodę lokalizacji źródła zapadu napięcia bazującej na informacji o kierunkowym przeciążeniu prądowym. Źródło zapadu napięcia jest lokalizowane na podstawie pomiaru amplitudy i fazy prądu w czasie zapadu i przed zapadem. Porównano metodę z z dotychczas stosowanymi metodami DR i PCSC.