نوع مقاله : مقالة تحقیقی (پژوهشی)
نویسندگان
1 دانشجوی دکتری، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
2 استادیار، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
چکیده
از مهمترین مسائل مربوط به تامین توان لامپ های TWTA در ماهواره ها داشتن ریپل پایین ، بازده بالا، قابلیت اطمینان بالا ، حجم و وزن بهینه می باشد. در این مقاله راندمان و قابلیت اطمینان مبدل الکترونیک-قدرت DC/DC ولتاژ بالا برای کاربرد در سامانه‌های ماهواره و فرستنده آن بهینه می‌شود. هدف بهینه سازی، حداقل سازی تابع هدف که شامل راندمان و قابلیت اطمینان است به کمک الگوریتم ژنتیک چند هدفه (NSGA-II) می باشد. بمنظور ارزیابی قابلیت اطمینان از مدل مارکوف استفاده می شود که در آن خطاهای اتصال کوتاه و مدار باز برای کلیدها و دیودهای مدار و خطای اتصال کوتاه برای المان‌های پسیو مدار در نظر گرفته شده است. برای بهینه سازی ابتدا متغیرهای ورودی الگوریتم به عنوان ورودی تابع هدف تعیین می‌شوند تا به کمک آنالیز حساسیت پارامترهایی که دارای حساسیت پایینی هستند و تغییراتشان بر تابع هدف تاثیر عمده ندارد، حذف شوند. همچنین پارامترهای الگوریتم NSGA-II شامل تعداد تکرار، تعداد جمعیت و احتمال تقاطع و جهش برای محاسبه دقیق متغیرهای مدار، تعیین شده‌اند. همانگونه که در بخش نتایج آورده شده است در این روش علاوه بر حفظ راندمان بالا با انتخاب بهینه المان ها می توان به قابلیت اطمینان بالا برای این مبدل دست یافت.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Optimizing and increasing the reliability in high power supply using TWTA lamps
نویسندگان [English]
- Peyman Mohammadi 1
- Mehdi Alemi Rostami 2
1 PhD, Student, Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran, Iran
2 Assistant Professor, Aerospace Research and Technology, Ministry of Science, Research and Technology,Tehran, Iran
چکیده [English]
One of the most important issues related to the power supply of TWTA lamps in satellites is to have low ripple, high efficiency, high reliability and optimal volume and weight,. In this article, the efficiency and reliability of high voltage DC/DC electronic-power converter is optimized for use in satellite and TWTA lamps. The goal of optimization using multi-objective genetic algorithm (NSGA-II) in this article is to minimize the objective function, which includes efficiency and reliability. Markov model is used to evaluate reliability, in which short-circuit and open-circuit errors are considered for circuit switches and diodes, and short-circuit errors are considered for passive circuit elements. for optimization, first, the input variables of the algorithm are determined as the input of the objective function, so that with the help of sensitivity analysis, the parameters that have low sensitivity and their changes do not have a major impact on the objective function are eliminated. parameters of NSGA-II algorithm, including the number of iterations, the number of populations, and the probability have been determined for the accurate calculation of circuit variables. the results section this method, in addition to maintaining high efficiency, with the optimal selection of elements, high reliability can be achieved .
کلیدواژه‌ها [English]
- High voltage DC converter
- reliability
- efficiency
- genetic algorithm
- Markov model
- klystron lamps
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