Input power control of grid-connected inverters under a low irradiance condition to improve efficiency and power quality for distributed rooftop photovoltaic systems
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Abstract
From increasing the trend of the rooftop photovoltaic (PV) system and reducing the performance of grid-connected inverters with low irradiation, this paper presents the efficiency and power quality improvements of the grid-connected PV system by controlling the input power of inverters under low irradiance conditions. The relationship between efficiency and power was utilized by using PVsyst simulation to control the proper inverter parallel following the power of solar cell panels on the changing irradiance. Moreover, in this paper, the different output power of inverters on the total harmonic distortion of currents (THDi) was also considered. The research results revealed that the output power of inverters with the proposed method under low irradiance conditions could be increased from 63.29 W to 76.58 W. Consequently, the efficiency of the proposed method was more than that of the conventional distributed PV system. As a result, it could be able to boost the energies by 21%. Furthermore, the experimental results also clearly confirmed that increasing the input power under low irradiance conditions affects the decrease of the THDi from 18% to 11.25%.
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