IJE TRANSACTIONS C: Aspects Vol. 31, No. 6 (June 2018) 1221-1229   

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H. Rahimi-Mirazizi and M. Agha-Shafiyi
( Received: October 06, 2017 – Accepted: February 06, 2018 )

Abstract    One of the key challenges of employing photovoltaic systems is to extract maximum power of the panels. This problem is known as maximum power point tracking (MPPT) technique. This means that establishing a situation in which output power of the panels reaches its maximum allowable power. In this context, this paper is to assess the technical requirements to achieve maximum output power of a number of photovoltaic (PV) panels in Z-source inverters. For the sake of simplicity and without loss of generality, a generic 7-level Z-source multi-level inverter to use with the PV panels is considered for our purpose. The evaluation is made in terms of the analysis of the input resistance of the connected inverter. The simulation results show that achieving the maximum power point (MPP) depends on the various governing factors including components of the inverter (i.e. load, frequency switching, and electric elements value), irradiance level, ambient temperature, and partial shading effect. Also, as the results demonstrate, in a number of combinations of the conditions there is not an optimum situation in terms of the MPPT. In addition, major part of the findings is implemented on a practical system.


Keywords    MPPT algorithm, Input resistance, Z-source inverter, Photovoltaic panel, Multi-level inverter


چکیده    یکی از مسائل سیستمهای فوتوولتائیک، مسئله استحصال حداکثر توان از پانلها می باشد. این مهم با عنوان الگوریتم MPPT شناخته می شود و به معنای رهگیری حداکثر توان پانلهای خورشیدی می باشد. در این مقاله تحقق پذیری این الگوریتم در اینورتر خورشیدی هفت سطحی Z-source نوعی بررسی می شود. تحقق پذیری الگوریتم بر مبنای محاسبه و آنالیز مقاومت دیده شده از دو سر مبدل می باشد. نتایج شبیه سازی نشان می دهد که تحقق الگوریتم MPPT به پارامترهای مختلفی مانند: بار، فرکانس سوئیچینگ، مقادیر عناصر مدار، سطح تابش، دمای محیط و اثر سایه زدگی جزئی بستگی دارد. همچنین نتایج حاکی از آنست که در بسیاری از شرایط تحقق الگوریتم مذکور ممکن نیست. ضمناً بسیاری از نتایج حاصله با تست عملی سیستم نیز، مقایسه شده است.

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