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Parasitic Effects on the Performance of DC-DC SEPIC in Photovoltaic maximum Power Point Tracking Applications

Smart Grid and Renewable Energy 2013年第1期4卷 113-121页

作者： Nur mohammad muhammad Quamruzzaman mohammad Rubaiyat Tanvir Hossain mohammad rafiqul Alam Department of Electrical & Electronic Engineering Bangladesh University of Engineering & Technology Dhaka Bangladesh. Department of Electrical & Electronic Engineering Chittagong University of Engineering & Technology Chittagong Bangladesh

This paper presents an analysis of the effect of parasitic resistances on the performance of DC-DC Single Ended Pri- mary Inductor Converter (SEPIC) in photovoltaic maximum power point tracking (mPPT) applications. The energy storage elements incorporated in the SEPIC converter possess parasitic resistances. Although ideal components significantly simplifies model development, but neglecting the parasitic effects in models may sometimes lead to failure in predicting first scale stability and actual performance. Therefore, the effects of parasitics have been taken into consideration for improving the model accuracy, stability, robustness and dynamic performance analysis of the converter. Detail mathematical model of SEPIC converter including inductive parasitic has been developed. The performance of the converter in tracking mPP at different irradiance levels has been analyzed for variation in parasitic resistance. The converter efficiency has been found above 83% for insolation level of 600 W/m2 when the parasitic resistance in the energy storage element has been ignored. However, as the parasitic resistance of both of the inductor has increased to 1 ohm, a fraction of the power managed by the converter has dissipated;as a result the efficiency of the converter has reduced to 78% for the same insolation profile. Although the increasing value of the parasitic has assisted the converter to converge quickly to reach the maximum power point. Furthermore it has also been observed that the peak to peak load current ripple is reduced. The obtained simulation results have validated the competent of the mPPT converter model.

关键词： Photovoltaic (PV) Renewable Energy Systems DC-DC Converter Parasitic Resistance maximum Power Point Tracking (mPPT) Single Ended Primary Inductance Converter (SEPIC)

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Cutaneous Abnormalities in Chronic Kidney Disease Patients with and without Dialysis

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Journal of Biosciences and medicines 2020年第1期8卷 64-76页

作者： md. Obaidur Rahman muhammad rafiqul Alam Asia Khanam md. Rezaul Alam md. Kabir Hossain A. K. m. Shahidur Rahman Fahmida Haque Department of Nephrology Cumilla Medical College & Hospital Cumilla Bangladesh Department of Nephrology Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh Department of Dermatology CARe Medical College & Hospital Dhaka Bangladesh

Background: Chronic kidney disease (CKD) is increasingly prevalent worldwide. CKD may present with different cutaneous manifestations. Objectives: To evaluate the dermatological manifestations and compare these manifestations between patients with maintenance hemodialysis (mHD) and non-dialysis groups. methods: It was a cross sectional study conducted in the Department of Nephrology, Bangabandhu Sheikh mujib medical University (BSmmU), Dhaka, Bangladesh from April 2013 to march 2014. A total of 150 hospital admitted CKD patients were evaluated for dermatological manifestations. Age, gender, haemoglobin level, 24-hours urinary total protein (UTP), serum creatinine, serum fasting lipid profile, estimated glomerular filtration rate (e-GFR) and dermatological manifestations of the study subjects were recorded accordingly. Inter-group comparisons were made between patients with and those without cutaneous abnormality. Results: Out of 150 study subjects, 99 (66%) were male and 51 (34%) were female, 69 (46%) patients were on mHD and 81 (54%) patients were without dialysis, their mean (±SD) age was 44.6 ± 12.3 year. A Total of 126 (84%) patients had cutaneous abnormalities;among them 69 (54.76%) were pre-dialytic and 57 (45.24%) were on mHD group. The mean (±SD) serum creatinine was relatively higher but haemoglobin level was significantly lower (p = 0.021), while UTP was significantly higher (p = 0.038) among patients with cutaneous abnormality. There was no relationship between lipid profile with cutaneous abnormality. Among 126 (84%) patients with cutaneous abnormality;pallor was the most common cutaneous abnormality (72%) followed by xerosis (68.66%), pruritus (65.33%), half and half nails (38.66%), pigmentation (33.33%), purpura/ecchymosis (16.66%), fungal infection (16%), ulcerative stomatitis (10.66%) and bacterial infection (10%). Pigmentation (52.6%), purpura (35.1%), ulcerative stomatitis (21.1%) and bacterial infection (19.3%) were significantly higher in mHD gro

关键词： Chronic Kidney Disease (CKD) Cutaneous manifestations maintenance Hemodialysis (mHD)

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