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Issue Info: 
  • End Date: 

    آبان 1387
Measures: 
  • Citations: 

    0
  • Views: 

    551
  • Downloads: 

    0
Keywords: 
Abstract: 

یکی از موارد مهم در طراحی و ساخت اینورترهای سه فاز پرقدرت انتخاب الگوریتم سوئیچینگ مناسب است. انتخاب الگوریتم سوئیچینگ مناسب سبب کاهش تلفات سوئیچینگ در اینورترهای سه فاز می شود. البته در انتخاب روش سوئیچینگ میزان کل اعوجاج هارمونیکی (THD) ولتاژ خروجی نیز باید در مد نظر باشد و بین مقدار THD ناشی از این روش و میزان کاهش تلفات باید مصالحه صورت گیرد. برای کنترل سوئیچ ها می توان از الگوریتم های مدولاسیون فضای برداری (SVM) استفاده نمود، روش های SVM روش های بسیار مناسب برای پیاده سازی بوسیله سیستم های میکروپروسسوری مانند DSP ها هستند. در این پروژه انواع روش های SVM از نوع Bus Clamped برای سوییچینگ اینورترهای پرقدرت شبیه سازی و پیاده سازی شد و نتایج آنها از نظر THD و تلفات سوییچینگ با یکدیگر مقایسه گردیدند.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

TOLUE BEHNAZ

Issue Info: 
  • Year: 

    2018
  • Volume: 

    13
  • Issue: 

    2
  • Pages: 

    83-92
Measures: 
  • Citations: 

    0
  • Views: 

    308
  • Downloads: 

    182
Abstract: 

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Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    46
Measures: 
  • Views: 

    221
  • Downloads: 

    124
Abstract: 

LET V BE A VECTOR SPACE OVER FIELD F. THE INDEPENDENCE GRAPH OF V, DENOTED BY GV IS A GRAPH WITH ALL ELEMENTS OF V MINUS ZERO AS VERTICES, AND TWO DISTINCT VERTICES N1 AND N2 ARE ADJACENT IF AND ONLY IF {N1, N2} IS INDEPENDENT. IN THIS PAPER WE OBTAIN SOME PROPERTIES OF THE INDEPENDENCE GRAPH. FOR EXAMPLE IT IS SHOWN THAT WHEN THE INDEPENDENT GRAPH IS COMPLETE.

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Issue Info: 
  • Year: 

    2014
  • Volume: 

    40
  • Issue: 

    6
  • Pages: 

    1453-1468
Measures: 
  • Citations: 

    0
  • Views: 

    690
  • Downloads: 

    183
Abstract: 

We show that the character SPACE of the VECTOR-valued Lipschitz algebra Lipa (X, E) of order, is homeomorphic to the cartesian product X×ME in the product topology, where X is a compact metric SPACE and E is a unital commutative Banach algebra. We also characterize the form of each character on Lipa (X, E).By appealing to the injective tensor product, we then identify the character SPACE of the VECTOR-valued polynomial Lipschitz algebra LipaP(X, E), generated by the polynomials on the compact SPACE XÍCn. It is also shown that LipaP(X, E) is the injective tensor product LipaP(X, E)ÄÙÎE. Finally, we characterize the form of each character on LipaP(X, E).

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Issue Info: 
  • Year: 

    2014
  • Volume: 

    4
Measures: 
  • Views: 

    151
  • Downloads: 

    120
Abstract: 

THIS PAPER PRESENTS AN OPTIMUM SWITCHING PATTERN FOR THE SPACE VECTOR MODULATION (SVM) OF MATRIX CONVERTERS BASED ON A GENETIC ALGORITHM. THE POSSIBILITY OF CHOOSING THE SEQUENCE OF ACTIVE DUTY CYCLES, AND THE ABILITY TO ALLOCATE THE DURATION OF THE INACTIVE DUTY CYCLE TO EACH ONE OF THE ZERO DUTY CYCLES IN A MATRIX CONVERTER SVM, PROVIDE SOME DEGREES OF FREEDOM IN DESIGNING OF THE SWITCHING PATTERN. THIS LEADS TO AN OPTIMIZATION PROBLEM. THEREFORE, A SUITABLE GENETIC ALGORITHM FOR SOLVING THE SWITCHING PATTERN OPTIMIZATION PROBLEM IS ADOPTED, AND AN OBJECTIVE FUNCTION TO MINIMIZE THE WEIGHTED TOTAL HARMONIC DISTORTION (WTHD) AND THE LOW-ORDER HARMONICS OF THE OUTPUT VOLTAGE IS PROPOSED. SIMULATIONS IN MATLAB/SIMULINK CONFIRM THE VALIDITY OF ANALYTICAL ACHIEVEMENTS.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

TURNEY P.D. | PANTEL P.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    37
  • Issue: 

    1
  • Pages: 

    141-188
Measures: 
  • Citations: 

    1
  • Views: 

    218
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2009
  • Volume: 

    6
  • Issue: 

    4
  • Pages: 

    1-9
Measures: 
  • Citations: 

    0
  • Views: 

    356
  • Downloads: 

    170
Abstract: 

In this paper, we study fuzzy substructures in connection with Hv -structures. The original idea comes from geometry, especially from the two dimensional Euclidean VECTOR SPACE. Using parameters, we obtain a large number of hyperstructures of the group-like or ring-like types. We connect, also, the mentioned hyperstructures with the theta-operations to obtain more strict hyperstructures, as Hv -groups or Hv-rings (the dual ones).

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Issue Info: 
  • Year: 

    2008
  • Volume: 

    19
  • Issue: 

    10-1 (SUPPLEMENT ELECTRICAL, INDUSTRIES AND CIVIL ENGINEERING)
  • Pages: 

    33-41
Measures: 
  • Citations: 

    0
  • Views: 

    267
  • Downloads: 

    0
Keywords: 
Abstract: 

SPACE VECTOR Current Regulators (SPCR) have low harmonic currents in steady state, but they have slower transient response compared to other control methods such as hysteresis current regulator. In this paper a new method is proposed to improve transient response of SPCR compared to conventional methods. The proposed technique is based on adjustment of zero VECTOR time intervals and modifying the current regulator PI controller output. The proposed method is used in transients. In steady state, the conventional SPCR method is used. The proposed technique can be applied to existing SPCR systems with no change in the hardware and minimum changes in the DSP software. Simulation results indicate that with the proposed method, the magnitude of current error is reduced compared to the conventional SPCR method. The performance of the proposed method is verified experimentally with a laboratory setup using Texas Instruments TMS320F2407A Digital Signal Processor (DSP) and tested on a 1.5 KW induction motor.

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Author(s): 

DEHGHANI M.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    4
  • Issue: 

    3
  • Pages: 

    42-46
Measures: 
  • Citations: 

    1
  • Views: 

    322
  • Downloads: 

    198
Abstract: 

The ”massless” VECTOR field equation in de Sitter (dS) 4-dimensional SPACE is gauge invariant under some special gauge transformations. It is also gauge invariant in ambient SPACE notations in which the field equation is written in terms of the Casimir operators of dS group. In this paper the "massless" VECTOR field equation has been solved in the physical case. It has been shown that the solution can be written as the multiplication of a generalized polarization VECTOR and a ”massless” conformally coupled scalar field in the ambient SPACE notations. The physical VECTOR twopoint function has been calculated using ambient SPACE formalism and its zero curvature limit has been considered. It is shown that the physical VECTOR two-point can be written in terms of the conformally coupled massless scalar two-point function in the ambient SPACE notations. The two-point function is expressed in terms of dS intrinsic coordinates from its ambient SPACE counterpart, which is dS-invariant and is free from any divergences.

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Author(s): 

صوابی امید

Issue Info: 
  • Year: 

    0
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    74-77
Measures: 
  • Citations: 

    1
  • Views: 

    186
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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