IJE TRANSACTIONS C: Aspects Vol. 31, No. 9 (September 2018) 1536-1545    Article in Press

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S. Masomi Kazraji, M. R. Feyzi, M. B. B. Sharifian and S. Tohidi
( Received: December 27, 2017 – Accepted in Revised Form: April 26, 2018 )

Abstract    The sensorless model predictive force control (SMPFC) is a strong method for controlling the drives of three-phase 4(6)-switch inverter linear induction motors. This kind of inverter can be employed for the fault tolerant control in order to solve the problem of open/short circuit in the 6-switch inverters (B6). This paper propose a method for the SMPFC of a linear induction motor (LIM) fed by a 4-switch inverter fed along with DC-link voltage offset reduction. Simulations have been performed on several different LIMs in MATLAB software to determine the weight coefficients of stator flux and reduction of the capacitor voltage offset. Then, a relationship has been proposed for determining the weight coefficients in the cost function of the SMPFC. By using weight coefficients in the cost function, the B4 inverter voltage vectors are obtained for exact prediction. The balance of currents is improved by determining the appropriate value for the weight coefficient of the capacitor voltage offset reduction. Simulation results are provided for validation of the suggested control method.


Keywords    Linear Induction Motor, Sensorless Model Predictive Force Control, 4-switch Inverter, Weight Coefficient



کنترل بدون حسگر پیش‌ بین نیرو مبتنی بر مدل (SMPFC) روشی قدرتمندی برای کنترل درایوهای موتور القایی خطی با اینورتر سه فاز 4 (6) سوئیچه می¬باشد. این نوع اینورتر می¬تواند برای کنترل تحمل خطا به منظور حل مشکل مدار باز/ اتصال کوتاه در اینورترهای 6 سوئیچه (B6) به¬کار گرفته شود. این مقاله یک روش برای SMPFC موتور القایی خطی (LIM) تغذیه شده توسط یک اینورتر 4 سوئیچه به¬همراه کاهش آفست ولتاژ خازن لینک DC پیشنهاد می¬دهد. شبیه¬سازی روی چندین موتور القایی خطی مختلف در نرم¬افزار MATLAB برای تعیین ضرایب وزنی شار استاتور و کاهش آفست ولتاژ خازن انجام شده است. سپس، یک رابطه برای تعیین ضرایب DC در تابع هزینه SMPFC پیشنهاد شده است. با استفاده از روابط ضرایب وزنی در تابع هزینه، بردارهای ولتاژ اینورتر 4 سوئیچه برای پیش¬بینی دقیق به¬دست آمده است. تعادل بین جریان¬ها با تعیین مقدار مناسب برای ضریب وزنی کاهش آفست ولتاژ خازن بهبود می¬یاید. نتایج شبیه¬سازی برای تأیید روش کنترلی پیشنهادی ارائه شده است.


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