یک روش جدید برای ردیابی نقطه حداکثر توان سرتاسری در آرایه‌های خورشیدی شامل چند ردیف موازی تحت شرایط سایه جزئی

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی برق - دانشگاه صنعتی سهند

چکیده

در این مقاله یک روش جدید برای استخراج نقطه پیک سرتاسری (GMPP) آرایه فتوولتاییک PV تحت شرایط سایه جزئی (PSC) ارائه شده‌است. در روش پیشنهادی، نشان داده می‌شود که مستقل از الگو و شدت تابش، موقعیت GMPP همواره در همسایگی پیک سرتاسری یکی از ردیف‌های آرایه PV می‌باشد. لذا، تعداد نقاط پیک محلی مورد آزمون در روش پیشنهادی برخلاف روش‌های موجود که به تعداد سطوح تابشی مختلف در سطح آرایه می‌باشد، مستقل از الگو و شدت تابش بوده و برابر تعداد ردیف‌های موازی در آرایه فتوولتاییک می‌باشد. بر این اساس، برای ردیابی GMPP در PSC، ابتدا GMPP هر ردیف تخمین زده می‌شود و سپس هر کدام از نقاط تخمین‌زده‌شده به مبدل الکترونیک قدرت اعمال شده و نقطه‌ای که بیش‌ترین توان را به‌دست دهد به‌عنوان GMPP آرایه PV شناخته می‌شود. نتایج عددی و مطالعه مقایسه‌ای با روش‌های مشابه، عمل‌کرد مطلوب الگوریتم پیشنهادی را در یافتن GMPP از نظر دقت و سرعت، تأیید می‌کند.   

کلیدواژه‌ها

عنوان مقاله [English]

A New Method for Global Maximum Power Point Tracking of Photovoltaic Arrays Including Several Parallel Strings under Partial Shading Conditions

نویسندگان [English]

  • S. M. Hashemzadeh
  • M. Hejri
Faculty of Electrical Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

In this paper, a new method for extracting the global maximum power point (GMPP) of a PV array under partial shading conditions (PSCs) is presented. In the proposed method, it is shown that, independent of the pattern and intensity of the radiation, the GMPP position is always in the neighboring of the global peaks of one of the photovoltaic (PV) strings in the PV array. Therefore, in contrast to the existing methods in which the number of local peaks, tested as a GMPP candidate, is dependent on the number of different radiation levels on the array surface, in the proposed technique this number is reduced to the number of parallel strings in the photovoltaic array and is independent of the irradiation pattern on the PV array. As a result, to track the GMPP in PSC, first the GMPP of each PV string is estimated, and then the voltage of each of the estimated points is given to the power electronic converter as a reference voltage to regulate the PV array voltage at the corresponding candidate GMPP voltage. Next, in each case, the produced power is recorded and the voltage that produces the maximum power is known as the final GMPP of the PV array. Numerical results and comparative study with similar methods confirm the desirable performance of the proposed algorithm in finding the GMPP with an acceptable speed and accuracy.

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