http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Saly George (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter
Raj, Nithin,G, Jagadanand,George, Saly The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6
Cascaded H-bridge multilevel inverters are currently used because it enables the integration of various sources, such as batteries, ultracapacitors, photovoltaic array and fuel cells in a single system. Conventional modulation schemes for multilevel inverters have concentrated mainly on the generation of a low harmonic output voltage, which results in less effective utilization of connected sources. Less effective utilization leads to a difference in the charging/discharging of sources, causing unsteady voltages over a long period of operation and a reduction in the lifetime of the sources. Hence, a charge balance control scheme has to be incorporated along with the modulation scheme to overcome these issues. In this paper, a new approach for charge balancing in symmetric cascaded H-bridge multilevel inverter that enables almost 100% charge balancing of sources is presented. The proposed method achieves charge balancing without any additional stages or complex circuit or considerable computational requirement. The validity of the proposed method is verified through simulation and experiments.
-
A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter
Nithin Raj,Jagadanand G,Saly George 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6
Cascaded H-bridge multilevel inverters are currently used because it enables the integration of various sources, such as batteries, ultracapacitors, photovoltaic array and fuel cells in a single system. Conventional modulation schemes for multilevel inverters have concentrated mainly on the generation of a low harmonic output voltage, which results in less effective utilization of connected sources. Less effective utilization leads to a difference in the charging/discharging of sources, causing unsteady voltages over a long period of operation and a reduction in the lifetime of the sources. Hence, a charge balance control scheme has to be incorporated along with the modulation scheme to overcome these issues. In this paper, a new approach for charge balancing in symmetric cascaded H-bridge multilevel inverter that enables almost 100% charge balancing of sources is presented. The proposed method achieves charge balancing without any additional stages or complex circuit or considerable computational requirement. The validity of the proposed method is verified through simulation and experiments.
-
Nair Deepthi S,Jagadanand G.,George Saly 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5
Torque estimation for Direct Torque Controlled BLDC motor drive using Kalman Filter and Extended Kalman Filter are described in this paper. In conventional direct torque control method, the torque estimation is done based on the position information, which in turn requires position sensors for accurate estimation. In this paper, torque is directly estimated using Kalman fi lter and Extended Kalman Filter algorithms without the aid of any feedback information, and a comparison is made between the two. Both the algorithms are perceptive to follow the actual torque; the error between the actual and reference is used for the selection of appropriate voltage vector for inverter switching. The refl ection of load changes in the control algorithm is also a part of the interest in this work. The potential of Extended Kalman Filter to follow exactly the changes in the load torque is utilized here and Extended Kalman Filter based sensorless drive is proposed for the torque estimation in Direct Torque Controlled BLDC motor. The performance parameters, viz. computational eff ort, torque ripple reduction are found to be superior with the Extended Kalman Filter algorithm, which is validated.
-
One cycle controlled three input three output DC to DC converter
P. Hema Rani,Arun Kumar Behera,Syam S. Sundar,Saly George,S. Ashok 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.1
A single renewable source is insufficient for providing a reliable and continuous power supply. The multi-input DC to DC converter (MIDC) provides for the hybridization of different energy sources with a single output. Various grid voltages exist and different applications require different DC voltages. If the MIDC provides multiple outputs, it becomes a multi-input multi-output (MIMO) converter. In this paper, a triple input triple output (TITO) DC–DC buck-boost converter is proposed for voltage regulation and power management. It combines the feature of multi-input and multi-output. The proposed converter consists of only one inductor, which reduces the number of active elements. A control circuit with a one-cycle control strategy is proposed to achieve this objective. A fixed ratio power management strategy is proposed for power management. The rising edge synchronization PWM method is realized as a suitable switching strategy for the converter. To design the compensator for the converter control system, a small signal model of the converter is developed. A PI controller is used to regulate the output voltage and the one cycle control (OCC) technique is used for current control. The operating characteristics of the proposed converters are validated by hardware results obtained from an Opal-RT real-time simulator.
-
José Meneses de Morais Filho,João Nogueira Neto,Lyvia Maria Rodrigues de Sousa Gomes,Izabelle Smith Fraza˜o Ramos,Salie Santos Rodrigues Oliveira,George Castro F. Melo,Lucilene Amorim Silva,Ed Carlos 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.4
Endometriosis was induced (autotransplant) in Wistar rats. After 21 days, the rats were randomly divided into two groups (16 female rats each). Control group was forced-fed 0.9% sodium chloride solution, and the ginger group was forced-fed 0.5 mg/100 g of Zingiber officinale Roscoe fresh extract, both by gavage, for 14 days, in addition to their normal diet. After that, an anesthetic dose (ketamine/xylazine) was administered until euthanasia. Peritoneal lavage fluid was collected to evaluate tumor necrosis factor (TNF)-α and interleukin (IL)-6, and autotransplant was measured and excised to evaluate histology. The final mean volumes were larger in the control group (120.92 mm3 ± 78.91) than in the ginger group (40.50 mm3 ± 19.57) (P = .01). The endometriosis foci increased in the control group from 45.10 mm3 ± 29.96 at 21 days postimplantation to 120.92 mm3 ± 78.91 on the day of euthanasia (P = .02). In the ginger group, a slight increase was observed from 38.43 mm3 ± 19.96 to 40.50 mm3 ± 19.57, without statistical difference (P = .83). In addition, a greater increase in growth of the endometriosis foci was found when compared with the control (75.81 mm3 ± 58.95) and ginger groups (2.07 mm3 ± 18.87) (P = .004). No difference was found in TNF-α (P = .51) and in IL-6 (P = .12). The degree of lesion atrophy was higher in the ginger group (1 ± 0.92) than in the control group (2.25 ± 1.16) (P = .03). The ginger extract reduced and atrophied autotransplanted endometriosis foci, but did not reduce IL-6 and TNF-α in the peritoneal lavage fluid.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
