طراحی و ساخت یک مبدل بوست-فلای بک بهره بالا با سوئیچینگ نرم
محورهای موضوعی : انرژی های تجدیدپذیر
قاسم حق شناس جزی
1
(کارشناسی ارشد- دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد، ایران)
سید محمد مهدی میرطلائی
2
(استادیار- دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد، ایران)
کلید واژه: کلیدزنی نرم, مبدل بوست- فلای بک, مبدل بهره بالا,
چکیده مقاله :
در این مقاله یک مبدل بوست-فلای بک با بهره بالا و کلید زنی نرم پیشنهاد شده است. کاربرد اصلی این مبدل در اتصال آرایه‌های خورشیدی به شبکه برای تولید برق می‌باشد. از آنجایی که در این کاربردها اختلاف سطح ولتاژ ورودی وخروجی مبدل زیاد است، نمی توان از مبدل های بوست و باک-بوست پایه استفاده کرد، زیرا این مبدل‌ها در ضریب وظیفه های نزدیک به یک دچار افت شدیدی در بازده می شوند. از این رو یک مبدل بهره بالای بوست فلای بک با سوئچینگ نرم جهت برطرف کردن مشکلات مبدل بوست پایه ارائه شده است که علاوه بر داشتن ضریب وظیفه مناسب در بهره های بالا، از مزایایی نظیر استرس ولتاژ بسیار کمتر از ولتاژ خروجی و شرایط سوئیچینگ نرم نیز برخوردار است. همچنین به دلیل اینکه در مبدل پیشنهادی از هیچ سوئیچ و یا هسته مغناطیسی اضافه‌ای جهت برقراری شرایط سوئیچینگ نرم استفاده نشده است تعداد المان مبدل نسبت به مبدل بوست فلای بک پایه افزایش چندانی نیافته است. عملکرد مبدل ابتدا به صورت تحلیلی مورد بررسی قرار گرفته سپس یک نمونه از مبدل پیشنهادی برای ولتاژ ورودی 40 ولت، ولتاژ خروجی 400 ولت و توان 100 وات در نرم افزار PSPICE شبیه سازی شده و نهایتا به صورت عملی پیاده سازی شده‌است تا نتایج تحلیلی و شبیه‌سازی مورد ارزیابی قرار گیرد.
In this paper a new soft switching boost-flyback converter is introduced to eliminate conventional boost-flyback converter problems in the high voltage applications. The main application of this converter is conction of PV system to the power system. In the proposed converter not only the operating duty cycles proper in high voltage gains but also the switch voltage stress is lower than output voltage. Also, in the proposed converter any auxiliary switch or magnetic core has not been used so the number of converter components has not increased much in comparison with the conventional boost-flyback converter. The operation principles of the proposed converter and its theoretical operation waveforms is presented. In order to justify the theoretical analysis, a prototype of the proposed converter is designed, simulated and experimentally implemented. The simulation and practical results are presented for a 100w boost-flyback converter with input voltage of 40V and output voltage of 400V.
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