Design, simulation and analysis of an improved EPLL based control technique with adaptive DC link voltage regulation for grid-connected solar PV system
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Date
2021-03
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Global electrical energy consumption is steadily increasing and there is a necessity to increase the power generation capacity. Conventional power generation schemes have serious environmental issues like climate change, high oil price, and water and oil pollution. The solution to these issues could be renewable energy (RE) sources, which eliminate the harmful emissions from the conventional sources. RE sources play an important role in overcoming the trepidation over energy crisis and environmental pollution in the world. Among all the renewable energy sources, solar energy is an imperious energy source that can deliver significant amount of electrical power with abundant solar potential. In recent years, increase in use of grid connected SPV system. These systems have the merits that apart from PV power consumed by the load, excess power is sent to the existing electrical grid. To provide effectiveness and to meet the required interconnecting standards controllers play a very important role and control techniques applied to grid connected inverters are gaining more importance. This thesis is an effort to development a proposed control technique to improve power quality of the system for grid-connected SPV system. To compensate active power injected into the grid, an improved enhanced phase lock loop (I-EPLL) control technique is used. The MATLAB/Simulink model is tested under various environmental and loading conditions. To reduce switching losses in the system, an adaptive DC link voltage regulation technique is used. The proposed control technique compensates for problems like power factor correction, current unbalance and current harmonics and also inject energy generated by solar PV to the grid with a very low THD even under nonlinear loading conditions.