نتایج جستجو برای: the variable sampling interval vsi control scheme
تعداد نتایج: 16331648 فیلتر نتایج به سال:
the present research study attempted to find out the extent to which two pre-task activities of “glossary of unknown vocabulary items” and “content related support” assisted efl language learners with their performance on listening comprehension questions across two different proficiency levels (low and high). data for this study were obtained from a total of 120 language learners, female and m...
With the use of sensorless control strategy, mechanical position sensors can be removed from gearbox, so as to decrease maintenance costs and enhance system robustness. In this paper, a switching PI based model reference adaptive (MRAS) observer using Fuzzy-Logic-Controller (FLC) is introduced for permanent magnet synchronous motor (PMSM) drives. The main work innovation paper include: 1) A dis...
according to research, academic self-concept and academic achievement are mutually interdependent. in the present study, the aim was to determine the relationship between the academic self-concept and the academic achievement of students in english as a foreign language and general subjects. the participants were 320 students studying in 4th grade of high school in three cities of noor, nowshah...
The current source inverter (CSI) is a power electronics topology that allows for the realization of variable speed drives (VSD). Compared to most common voltage (VSI), which can be directly connected source, CSI needs prestage generate constant bus. This article therefore seeks challenge this “accepted” consideration always precircuit and remove circuit by proposing an innovative i <sub xmlns:...
this research was conducted to examine the effect of a concurrent training on rest level of leptin of plasma and some hormonal factors in non-athlete subjects. the research population included non-athlete men who didn’t participate in any organized sport activities. 30 men were chosen voluntarily among the above-mentioned population and were divided into 2 groups: experimental (15 subjects) an...
ABSTRACT This paper analyses the dynamic performances of a VSI-DC brushless drive system suitable for an electrical vehicle propulsion. The main original part of the work is a computer simulator realized in Matlab-Simulink sofware package, based on the laboratory practical experiments. To monitorize and control the motor parameter variations and influences during the variable frequency motor dy...
A serious constraint in multilevel inverters is the capacitor voltage-balancing problem. The unbalance of the different DC voltage sources of the five-level Neutral Point Clamping Voltage Source Inverter (NPC-VSI) constituted the major limitation for the use of this power converter. To remedy to this problem, a new control solution to compensate the unbalanced DC voltages for the five-level NPC...
background: the aim of this study was to investigate the effects of two vitrification protocols on mouse metaphase stage ii (mii) oocytes and evaluate their effects on the expression of heat shock protein a1a (hsp a1a) and mnsod genes. materials and methods: groups of approximately 15 oocytes without cumulus complexes were collected and vitrified with 10% (v/v) ethylene glycol (eg) + 10% (v/v) ...
This paper presents the mathematical model and control of a voltage source inverter (VSI) connected to an alternating current (AC) microgrid. The VSI considered in this is six switches three-phase Pulse Width Modulated (PWM) inverter, whose output active reactive power controlled dq reference frame. strategy presented here state feedback with disturbance cancellation. signal either provided by ...
this study was conducted to investigate the impact of podcasts as a learning and teaching tool on iranian efl learners’ motivation for listening as well as on their listening comprehension ability. the study also investigated the learners’ perception towards listening to podcasts and examined whether the learners were likely to accept podcasts. out of fifty-five intermediate learners studying e...
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