یک مبدل بدون ترانسفورمر بسیار افزاینده جدید با ریپل جریان ورودی پایین برای سیستم های فتوولتائیک
محورهای موضوعی : مهندسی برق و کامپیوتر
کرار سعد فرج
1
,
مجید دلشاد
2
,
ومیض ریاض عبدالعظیم
3
,
محمد روح اله یزدانی
4
,
بهادر فانی
5
1 - دانشکده مهندسی برق، واحد اصفهان (خوراسگان)، دانشگاه آزاد اسلامی، اصفهان، ایران
2 - دانشکده مهندسي برق، واحد اصفهان (خوراسگان)، دانشگاه آزاد اسلامی، اصفهان، ایران
3 - دانشکده مهندسی، دانشگاه بغداد، بغداد، عراق
4 - دانشکده مهندسي برق، واحد اصفهان (خوراسگان)، دانشگاه آزاد اسلامی، اصفهان، ایران
5 - دانشکده مهندسي برق، واحد اصفهان (خوراسگان)، دانشگاه آزاد اسلامی، اصفهان، ایران
کلید واژه: مبدل¬های بسیار افزاینده, کلیدزنی نرم, مدولاسیون پهنای پالس, کلیدزنی در ولتاژ صفر,
چکیده مقاله :
در این مقاله یک مبدل بسیار افزاینده با بهره ولتاژ بسیار بالا و ریپل جریان ورودی پایین برای سیستمهای فوتو ولتاییک ارایه شده است. از ویژگی اصلی مبدل عدم استفاده از سلفهای ترویج شده و افزایش بهره با استفاده از خازنهای سوییچ شده می باشد لذا حجم و وزن مبدل بسیار کاهش یافته است. مدار کمکی شرایط کلیدزنی در ولتاژ صفر را برای سوییچهای اصلی و کمکی فراهم کرده است و به علت تعداد المان پایین راندمان مبدل بطور محسوس بهبود یافته است. ریپل جریان ورودی مبدل بسیار پایین است که موجب می گردد دنبال کردن ماکزیمم توان از سلولهای فوتوولتایک ساده گردد. به علت افزایش بهره و کاهش استرس ولتاژ روی سوییچها امکان استفاده از سوییچها با مقاومت پایینتر فراهم گشته و تلفات هدایتی متعاقبا کاهش می یابد. همچنین به خاطر عملکرد مکمل سوییچها طراحی مدار کنترل ساده می باشد و کنترل مبدل بصورت PWM باقی می ماند. مبدل در توان 110 وات و خروجی 330 ولت در نرم افزار PSPICE شبیه سازی شده است و در نهایت یک نمونه عملی از آن ساخته شده و نتایج آزمایشگاهی نتایج شبیه سازی را تایید می کنند.
In this paper, a step-up converter with very high voltage gain and low input current ripple for photovoltaic systems is presented. One of the main features of the converter is not using coupled- inductors and increasing gain by using switched-capacitors, so the volume and weight of the converter has been greatly reduced. The auxiliary circuit has provided zero voltage switching conditions for the main and auxiliary switches, and due to the low number of elements, the efficiency of the converter has been significantly improved. The input current ripple of the converter is very low, which makes it easy to track the maximum power point from the photovoltaic cells. Due to the increase in gain and decrease in voltage stress on the switches, it is possible to use switches with lower RDS(on), and conduction losses are subsequently reduced. Also, due to the complementary function of the switches, the design of the control circuit is simple and the control of the converter remains as PWM. The converter is simulated in PSPICE software with a power of 110 W and an output of 330 V, and finally a prototype is made of it, and the laboratory results confirm the simulation results.
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