بهبود بهره‌وری استفاده از سیستم‌های فتوولتائیک شناور در شمال ایران با استفاده از ساختار اینورتر چند-رشته‌ای دو-مرحله‌ای

محورهای موضوعی : انرژی های تجدیدپذیر

سینا سمسکنده ¹ , مهرداد حجت ² , محمد حسینی ابرده ³

1 - دانشکده برق و کامپیوتر- واحد شاهرود، دانشگاه آزاد اسلامی، شاهرود، ایران
2 - دانشکده برق و کامپیوتر- واحد شاهرود، دانشگاه آزاد اسلامی، شاهرود، ایران
3 - دانشکده برق و کامپیوتر- واحد شاهرود، دانشگاه ازاد اسلامی، شاهرود، ایران

تاریخ دریافت : 1401/02/12 تاریخ پذیرش : 1401/06/31 تاریخ انتشار : 1401/06/31

کلید واژه: فتوولتائیک, تابش, اینورتر, شناور, روش اغتشاش و مشاهده,

چکیده مقاله :

سیستم‌های فتوولتائیک شناور، رویکردی جدید برای استفاده از سیستم‌های فتوولتائیک در آب است. این سیستم، فرصت جدیدی را برای افزایش ظرفیت تولید سیستم‌های فتوولتائیک خورشیدی به ویژه در مناطق شمالی ایران که قیمت زمین زیاد است، ایجاد می‌کند. در این مقاله جهت افزایش بهره‌وری بیشتر از اینورترهای متصل به شبکه سیستم‌های خورشیدی شناور در مناطق شمالی کشور، ساختار اینورتر دو-مرحله‌ای با اینورتر چند-رشته‌ای ترکیب شده است. از طرفی دیگر، روش اغتشاش و مشاهده (P&O) یکی از متداول‌ترین روش‌های ردیابی حداکثر توان (MPPT) است که از معایب این روش می‌توان به نوسانات الگوریتم در طول تغییرات ناگهانی تابش اشاره کرد. از آنجایی که مناطق شمالی ایران به دلیل ابری بودن هوا دارای این تغییرات ناگهانی در طول تابش هستند، جهت غلبه بر این مانع، با اضافه کردن پارامتر تغییر جریان، الگوریتم اصلاح شده اعتشاش و مشاهده پیشنهاد گردیده است. در واقع در این ساختار دو-مرحله‌ای مبدل زتا و الگوریتم پیشنهادی اعتشاش و مشاهده جهت افزایش سطح ولتاژ مناسب پنل‌ها جهت روشن بودن اینورتر و ردیابی حداکثر توان استفاده می گردد و در مرحله دوم تبدیل توان DC به AC انجام می‌گیرد. جهت بررسی بهبود بهره‌وری، اینورتر پیشنهادی با اینورتر متمرکز تک-مرحله‌ای مورد مقایسه قرار می‌گیرد. همچنین در این مطالعه اثر باد و دمای آب در میزان تولید سیستم فتوولتائیک شناور در نظر گرفته شده است. شبیه سازی سیستم با استفاده از نرم افزار متلب انجام گرفته است. نتایج شبیه سازی نشان می‌دهد که اینورتر پیشنهادی دو-مرحله‌ ای چند-رشته‌ای، 88/18 کیلووات ساعت به طور متوسط توان تولید می‌کند که این میزان در مقایسه با اینورتر تک-مرحله‌ای متمرکز افزایش یافته است.

چکیده انگلیسی:

Floating photovoltaic (FPV) systems are a new approach to the use of water-based photovoltaic (PV) systems. This system creates a new opportunity to increase the production capacity of solar PV systems, especially in the northern regions of Iran, where the price of land is high. To enhance the efficiency of inverters connected to the network of FPV systems in the northern regions of Iran, we have combined the structure of a two-stage and a multi-string inverter in this paper. On the other hand, the perturb and observe (P&O) method is one of the most common methods for maximum power point tracking (MPPT) with a variety of disadvantages including algorithm fluctuations during sudden changes in radiation. Since these sudden changes during radiation occur abundantly in the northern regions of Iran due to cloudy weather, a modified P&O algorithm is proposed by adding a current change parameter to overcome this problem. In fact, the ZETA converter and the proposed algorithm are used in inverter and track the maximum power point and in the second stage, DC to AC conversion occurs. To evaluate the efficiency improvement, the proposed inverter is compared with a single-stage centralized inverter. This study also considered the effect of wind and water temperature on the production capacity of the FPV system. System simulation is performed using Matlab/Simulink software. The simulation results show that the proposed two-stage multi-string inverter produce an average of 18.88 kWh, which is an increase compared to the centralized single-stage inverter.

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