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- 검색키워드
- 저자 : Aminifar, F. (검색결과 3 건)
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M. Mokhtari,S. Golshannavaz,D. Nazarpour,F. Aminifar 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.3
This paper presents a novel theoretical method based on power analysis to obtain voltage reference values for an inverter-based compensator. This type of compensator, which is installed in parallel with the load, is usually referred to as the active filter. The proposed method is tailored to design the compensator in such a way that it can simultaneously balance the asymmetric load, as well as correct the power factor of the supply side. For clarity, a static compensator is first considered and a recursive algorithm is utilized to calculate the reactance values. The algorithm is then extended to calculate voltage reference values when the compensator is inverter based. It is evident that the compensator would be asymmetric since the load is unbalanced. The salient feature associated with the proposed method is that the circuit representation of system load is not required and that the load is recognized just by its active and reactive consumptions. Hence, the type and connection of load do not matter. The validity and performance of the new approach are analyzed via a numerical example, and the obtained results are thoroughly discussed.
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Mokhtari, M.,Golshannavaz, S.,Nazarpour, D.,Aminifar, F. The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.3
This paper presents a novel theoretical method based on power analysis to obtain voltage reference values for an inverter-based compensator. This type of compensator, which is installed in parallel with the load, is usually referred to as the active filter. The proposed method is tailored to design the compensator in such a way that it can simultaneously balance the asymmetric load, as well as correct the power factor of the supply side. For clarity, a static compensator is first considered and a recursive algorithm is utilized to calculate the reactance values. The algorithm is then extended to calculate voltage reference values when the compensator is inverter based. It is evident that the compensator would be asymmetric since the load is unbalanced. The salient feature associated with the proposed method is that the circuit representation of system load is not required and that the load is recognized just by its active and reactive consumptions. Hence, the type and connection of load do not matter. The validity and performance of the new approach are analyzed via a numerical example, and the obtained results are thoroughly discussed.
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Pectin purification from plant materials
Fatemeh Baghdadi,Kooshan Nayebzadeh,Mehrnaz Aminifar,Amir Mohammad Mortazavian 한국고분자학회 2023 Macromolecular Research Vol.31 No.8
Pectin, an intricate anionic polysaccharide, is found in the middle lamella of higher plants’ cell walls. It is employed as a gelling agent, thickener, stabilizer, and dietary fiber due to its unique properties. To obtain this carbohydrate polysaccharide, it must be extracted from its sources, namely different parts of fruits and vegetables, in various ways. After the extraction process, owing to the presence of other cell wall constituents such as cellulose microfibrils, hemicellulosic materials, starches, and lignin in the crude aqueous extract, varying methods are used to purify pectin. These methods are predominantly based on the disruption of pectins and solvent molecules interactions (e.g., alcohol precipitation or drying) as well as the complex formation of anionic pectins and cationic materials (e.g., pectin–protein and pectin–metal complexes). Each purification method leads to obtaining pectins with distinctive chemical configurations and characteristics due to the difference in their separation mechanisms. These differences can be in terms of the amounts of sugar contents, galacturonic acid, degree of methylation, the size of isolated pectic fractions, and so forth. Each method has some advantages and disadvantages, and the selection of each method should be based on the costs, needs, and characteristics of the desired pectin.
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