Instantaneous Responses of on-grid PV Plants to Changes in Environmental and Weather Conditions

Farzad Hosseini, behnam mostajeran goortani, Mehdi Niroomand


The operation of an on-grid, 20 KW, PV, pilot plant is analyzed. The instantaneous environmental and weather conditions including solar irradiance, temperature, and wind speed are recorded and analyzed, simultaneously along with, the instantaneous data from the plant including PV module temperature, generated power, current, and voltage. The power decreases with increasing ambient temperature. Increasing solar irradiance increases the temperature difference between modules and ambient. Instantaneous energy and exergy efficiencies during three different days, representing sunny, partly cloudy, and cloudy days, are further calculated. The energy efficiency varies between 5.76% and 15.53%, while that of exergy varies between 4.84% and 15.73%. For cloudy days, the exergy efficiency is higher than that of energy efficiency, while for a sunny day it is in reverse. Another important parameter affecting the generated power is partial shading on PV modules, particularly during early mornings and late afternoons. The instantaneous shading varies between 3% and 9%, because of small azimuth and elevation angles. It was found that partial shading of only 4.73% on PV modules may result significant power decrease of more than 52.3%. A new algorithm based on Fuzzy Logic is proposed to overcome the power decrease even under partial shading conditions.

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PV cell; instantaneous respond; Exergy and energy efficiency; partial shading

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