REF: S. Hosseini, B.M. Goortani, M. Niroomand, Instantaneous Responses of on-grid PV Plants to Changes in Environmental and Weather Conditions, International Journal of Renewable Energy Research, 6(4) 1296-1306 (2016).
Abstract:
This study focuses on photovoltaic research by analyzing the operation of a 20 KW on-grid PV pilot plant. The instantaneous environmental variables and weather conditions, such as solar irradiance, temperature, wind speed, and cloud cover, are recorded and analyzed simultaneously with the plant's responses, including PV module temperature, generated power, current, and voltage. It was observed that power output decreases with increasing ambient temperature, while higher solar irradiance results in a greater temperature difference between the modules and the surrounding environment. Additionally, instantaneous energy and exergy efficiencies were calculated over three different days, representing sunny, partly cloudy, and cloudy conditions, showcasing the energy efficiency ranging from 5.76% to 15.53% and exergy efficiency from 4.84% to 15.73%. Notably, during cloudy days, exergy efficiency surpasses energy efficiency, which is reversed on sunny days. Another critical factor affecting generated power is partial shading on PV modules, particularly in the early mornings and late afternoons, changing from 3% to 9% due to small azimuth and elevation angles. The study found that a partial shading of 4.73% on PV modules can lead to a significant power decrease of 52.3%. To address these challenges, a new algorithm based on Fuzzy Logic is proposed, aiming to mitigate power losses under partial shading conditions, contributing to the ongoing advancements in renewable energy research.
Keywords: PV cell; instantaneous response; exergy and energy efficiency; partial shading.
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