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RISS 인기검색어
- 검색키워드
- 저자 : Mehdi Rahnama (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Novel Average Value Model for Faulty Three-Phase Diode Rectifier Bridges
Mehdi Rahnama,Abolfazl Vahedi,Arta Mohammad Alikhani,Babak Nahid-Mobarakeh,Noureddine Takorabet 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
Rectifiers are widely used in industrial applications. Although detailed models of rectifiers are usually used to evaluate theirperformance, they are complex and time-consuming. Therefore, the Average Value Model (AVM) has been introduced to meetthe demand for a simple and accurate model. This type of rectifier modeling can be used to simplify the simulations of largesystems. The AVM of diode rectifiers has been an area of interest for many electrical engineers. However, healthy dioderectifiers are only considered for average value modeling. By contrast, faults occur frequently on diodes, which eventually causethe diodes to open-circuit. Therefore, it is essential to model bridge rectifiers under this faulty condition. Indeed, conventionalAVMs are not appropriate or accurate for faulty rectifiers. In addition, they are significantly different in modeling. In this paper,a novel application of the parametric average value of a three-phase line-commutated rectifier is proposed in which one diode ofthe rectifier is considered open-circuited. In order to evaluate the proposed AVM, it is compared with experimental andsimulation results for the application of a brushless synchronous generator field. The results clearly demonstrate the accuracy ofthe proposed model.
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Novel Average Value Model for Faulty Three-Phase Diode Rectifier Bridges
Rahnama, Mehdi,Vahedi, Abolfazl,Alikhani, Arta Mohammad,Nahid-Mobarakeh, Babak,Takorabet, Noureddine The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
Rectifiers are widely used in industrial applications. Although detailed models of rectifiers are usually used to evaluate their performance, they are complex and time-consuming. Therefore, the Average Value Model (AVM) has been introduced to meet the demand for a simple and accurate model. This type of rectifier modeling can be used to simplify the simulations of large systems. The AVM of diode rectifiers has been an area of interest for many electrical engineers. However, healthy diode rectifiers are only considered for average value modeling. By contrast, faults occur frequently on diodes, which eventually cause the diodes to open-circuit. Therefore, it is essential to model bridge rectifiers under this faulty condition. Indeed, conventional AVMs are not appropriate or accurate for faulty rectifiers. In addition, they are significantly different in modeling. In this paper, a novel application of the parametric average value of a three-phase line-commutated rectifier is proposed in which one diode of the rectifier is considered open-circuited. In order to evaluate the proposed AVM, it is compared with experimental and simulation results for the application of a brushless synchronous generator field. The results clearly demonstrate the accuracy of the proposed model.
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Rezaei, Ali Akbar,Salehi, Iraj,Karimi, Seyed Asaad,Rahnama, Mehdi The Korean Society for Reproductive Medicine 2020 Clinical and Experimental Reproductive Medicine Vol.47 No.1
Objective: The strong antioxidant activity of Commiphora mukul prompted us to conduct the present study to explore whether treatment with C. mukul extract (CME) would have any protective influence on sperm parameters, testosterone levels, and plasma glucose levels in streptozotocin (STZ)-induced diabetic rats. Methods: Male Wistar rats were randomly divided into four groups: control, control animals treated with CME, diabetic animals, and diabetic animals treated with CME. CME extract (300 mg/kg) was administered for 60 days by daily gavage. Diabetes was induced by an intraperitoneal injection of 50 mg/kg STZ. The epididymal sperm count, weight, motility, morphology, viability, and serum testosterone and glucose levels were determined. Results: In the diabetic animals, CME decreased blood glucose levels (p< 0.05), increased the total sperm count (p< 0.05), and decreased the proportion of sperm with abnormal morphology (p< 0.05). Diabetes reduced sperm motility (p< 0.001), and CME supplementation partially reversed this effect of diabetes (p= 0.003). Furthermore, in diabetic animals, CME decreased the proportion of immotile sperm (p< 0.001). In rats, diabetes caused a significant decrease (p< 0.05) in serum testosterone levels (F[3, 28] = 3.283, p= 0.035), but treatment of diabetic animals with CME increased serum testosterone levels. Conclusion: The present study demonstrated that C. mukul possesses proandrogenic activity and exerts a beneficial effect on sperm parameters in diabetic rats.
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