توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱DYNAMIC THERMAL MODELING OF WINDING TEMPERATURE RISE FOR DRY TYPE TRANSFORMERS
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس بین‌المللی مسائل فنی و فیزیکی در مهندسی قدرت، سال
تعداد صفحات: ۴
Transformers are the most important power conversion units used in the electrical systems considering their prices. The life of transformers has a considerable economic impact on the operation of an electrical system. Though the transformer life expectancy depends on the operating temperature, the life expectancy at various operating temperatures is not accurately known. The information regarding loss of life of insulation is considered to be the best way through which the transformer life expectancy can be expected. The most important parameter in transformers life expectancy is the insulation temperature value. The aim of this paper is to present a new and more accurate winding thermal model for dry–type transformers based on heat transfer theory, application of the lumped capacitance method and the thermal–electrical analogy.<\div>

۲THE COMPARISON OF AVERAGE AND HYSTERESIS CURRENT MODE CONTROL TECHNIQUE OF SINGLE PHASE BOOST POWER FACTOR CORRECTION CONVERTER
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس بین‌المللی مسائل فنی و فیزیکی در مهندسی قدرت، سال
تعداد صفحات: ۵
In this study, single–phase ac–dc boost converter with power factor correction (PFC) is presented. This converter reshapes the distorted input current waveform to approximate a sinusoidal current that is in phase with the input voltage. There are several effective techniques for achieving a sinusoidal input current waveform with low distortion. Two typical techniques for PFCs are average current mode control (ACMC) and hysteresis current mode control (HCMC). These control techniques are evaluated according to the control strategy, circuit components, and total harmonic distortion of input current. The boost converter is operated in continuous conduction mode (CCM). Both control techniques are simulated in Matlab\Simulink program.<\div>
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