ساختار جدید کلیدزنی نرم در مبدل DC/DC با ضریب بهره ولتاژ بالا و راندمان مناسب در توان انتقالی بالا
الموضوعات :امید شریفیانا 1 , مجید دهقانی 2 , غضنفر شاهقلیان 3 , سید محمد مهدی میرطلایی 4 , مسعود جباری 5
1 - دانشگاه آزاد اسلامی واحد نجف آباد
2 - دانشگاه آزاد اسلامی واحد نجف آباد
3 - دانشگاه آزاد اسلامی واحد نجف آباد
4 - دانشگاه آزاد اسلامی واحد نجف آباد
5 - دانشگاه آزاد اسلامی واحد نجف آباد
الکلمات المفتاحية: منابع انرژی نو, مبدل افزاینده, تشدید سری, ضریب بهره ولتاژ, کلیدزنی نرم,
ملخص المقالة :
از محدودیت‌های اصلی استفاده از انرژی‌های تجدیدپذیر برای تولید برق می‌توان به کم‌بودن ولتاژ خروجی نیروگاه‌های تولید برق با انرژی‌های نو اشاره کرد. بنابراین جهت بهره‌گیری کارآمدتر از انرژی‌های تجدیدپذیر طراحی یک مبدل با ضریب بهره بالاتر و راندمان بیشتر از اهمیت ویژه‌ای برخوردار است. در این مقاله یک ساختار جدید ارائه شده که هم‌زمان با داشتن یک مبدل افزاینده، تلفات ناشی از کلیدزنی نرم نسبت به روش‌های مرسوم به حداقل رسانده می‌شود. همچنین بر اساس روش ارائه‌شده تنش ولتاژ روی دیودها و کلیدها در حد قابل قبول محدود می‌شود. یک مبدل افزاینده ساده می‌تواند به کمک اضافه‌کردن یک شاخه موازی با ایجاد تشدید سری تا حد قابل ملاحظه‌ای ولتاژ خروجی را افزایش دهد و هم‌زمان کلیدزنی در ولتاژ صفر را ممکن سازد. مبدل پیشنهادی بدون اضافه‌کردن قطعه فعال به مبدل و با ساختار ساده غیر ایزوله در توان 500 وات و ولتاژ 385 ولت دارای ضریب بهره ولتاژ حدود 8/10 و راندمان بیشتر از 93% است. نتایج شبیه‌سازی عملکرد مبدل پیشنهادی را برای حالت‌های عملکردی مختلف نشان می‌دهد.
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